[PATCH] USB: ub 4: Zaitcev's quasi-S/G
Back out Axboe-style quasi-S/G and replace it with one command and repeated URBs. This is similar to what usb-storage does, only instead of a few URBs allocated together, one URB is reused. Jens's idea was very nice, but it collapsed when I had to support packet commads for CD burning. I cannot issue two or more packet commands where application expected only one. However, burning does not work completely yet. The cdrecord starts, recognizes the device, then aborts without writing a TOC. Signed-off-by: Pete Zaitcev <zaitcev@yahoo.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pete Zaitcev
Greg Kroah-Hartman
parent
6c1eb8c1c3
commit
a1cf96efba
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@ -235,27 +235,16 @@ struct ub_scsi_cmd {
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int stat_count; /* Retries getting status. */
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/*
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* We do not support transfers from highmem pages
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* because the underlying USB framework does not do what we need.
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*/
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char *data; /* Requested buffer */
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unsigned int len; /* Requested length */
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unsigned int current_sg;
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unsigned int nsg; /* sgv[nsg] */
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struct scatterlist sgv[UB_MAX_REQ_SG];
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struct ub_lun *lun;
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void (*done)(struct ub_dev *, struct ub_scsi_cmd *);
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void *back;
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};
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struct ub_request {
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struct request *rq;
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unsigned char dir;
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unsigned int current_block;
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unsigned int current_sg;
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unsigned int nsg; /* sgv[nsg] */
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struct scatterlist sgv[UB_MAX_REQ_SG];
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};
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/*
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*/
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struct ub_capacity {
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@ -351,8 +340,6 @@ struct ub_lun {
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int readonly;
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int first_open; /* Kludge. See ub_bd_open. */
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struct ub_request urq;
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/* Use Ingo's mempool if or when we have more than one command. */
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/*
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* Currently we never need more than one command for the whole device.
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@ -410,19 +397,16 @@ static void ub_cleanup(struct ub_dev *sc);
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static int ub_request_fn_1(struct ub_lun *lun, struct request *rq);
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static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct request *rq);
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static void ub_scsi_build_block(struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct ub_request *urq);
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static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct request *rq);
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static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_end_rq(struct request *rq, int uptodate);
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static int ub_request_advance(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_request *urq, struct ub_scsi_cmd *cmd);
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static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_urb_complete(struct urb *urb, struct pt_regs *pt);
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static void ub_scsi_action(unsigned long _dev);
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static void ub_scsi_dispatch(struct ub_dev *sc);
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static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_state_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd, int rc);
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static int __ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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static void ub_state_stat(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
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@ -793,8 +777,6 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
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return 0;
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}
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if (lun->urq.rq != NULL)
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return -1;
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if ((cmd = ub_get_cmd(lun)) == NULL)
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return -1;
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memset(cmd, 0, sizeof(struct ub_scsi_cmd));
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@ -813,7 +795,7 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
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cmd->state = UB_CMDST_INIT;
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cmd->lun = lun;
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cmd->done = ub_rw_cmd_done;
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cmd->back = &lun->urq;
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cmd->back = rq;
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cmd->tag = sc->tagcnt++;
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if (ub_submit_scsi(sc, cmd) != 0) {
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@ -828,22 +810,20 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
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static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct request *rq)
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{
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struct ub_request *urq;
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int ub_dir;
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int n_elem;
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urq = &lun->urq;
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memset(urq, 0, sizeof(struct ub_request));
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unsigned int block, nblks;
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if (rq_data_dir(rq) == WRITE)
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ub_dir = UB_DIR_WRITE;
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else
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ub_dir = UB_DIR_READ;
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cmd->dir = ub_dir;
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/*
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* get scatterlist from block layer
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*/
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n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]);
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n_elem = blk_rq_map_sg(lun->disk->queue, rq, &cmd->sgv[0]);
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if (n_elem <= 0) {
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printk(KERN_INFO "%s: failed request map (%d)\n",
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sc->name, n_elem); /* P3 */
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@ -854,7 +834,7 @@ static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
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sc->name, n_elem);
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return -1;
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}
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urq->nsg = n_elem;
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cmd->nsg = n_elem;
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sc->sg_stat[n_elem]++;
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/*
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@ -863,29 +843,10 @@ static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
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* The call to blk_queue_hardsect_size() guarantees that request
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* is aligned, but it is given in terms of 512 byte units, always.
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*/
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urq->current_block = rq->sector >> lun->capacity.bshift;
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// nblks = rq->nr_sectors >> lun->capacity.bshift;
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block = rq->sector >> lun->capacity.bshift;
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nblks = rq->nr_sectors >> lun->capacity.bshift;
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urq->rq = rq;
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urq->current_sg = 0;
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urq->dir = ub_dir;
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ub_scsi_build_block(lun, cmd, urq);
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return 0;
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}
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static void ub_scsi_build_block(struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct ub_request *urq)
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{
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struct scatterlist *sg;
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unsigned int block, nblks;
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sg = &urq->sgv[urq->current_sg];
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block = urq->current_block;
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nblks = sg->length >> (lun->capacity.bshift + 9);
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cmd->cdb[0] = (urq->dir == UB_DIR_READ)? READ_10: WRITE_10;
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cmd->cdb[0] = (ub_dir == UB_DIR_READ)? READ_10: WRITE_10;
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/* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
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cmd->cdb[2] = block >> 24;
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cmd->cdb[3] = block >> 16;
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@ -895,34 +856,15 @@ static void ub_scsi_build_block(struct ub_lun *lun,
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cmd->cdb[8] = nblks;
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cmd->cdb_len = 10;
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cmd->dir = urq->dir;
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cmd->data = page_address(sg->page) + sg->offset;
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cmd->len = sg->length;
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cmd->len = rq->nr_sectors * 512;
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return 0;
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}
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static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_scsi_cmd *cmd, struct request *rq)
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{
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struct ub_request *urq;
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urq = &lun->urq;
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memset(urq, 0, sizeof(struct ub_request));
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urq->rq = rq;
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sc->sg_stat[0]++;
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if (rq->data_len != 0 && rq->data == NULL) {
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static int do_print = 1;
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if (do_print) {
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printk(KERN_WARNING "%s: unmapped packet request"
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" flags 0x%lx length %d\n",
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sc->name, rq->flags, rq->data_len);
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do_print = 0;
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}
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return -1;
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}
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memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
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cmd->cdb_len = rq->cmd_len;
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int n_elem;
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if (rq->data_len == 0) {
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cmd->dir = UB_DIR_NONE;
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@ -931,8 +873,29 @@ static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
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cmd->dir = UB_DIR_WRITE;
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else
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cmd->dir = UB_DIR_READ;
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}
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cmd->data = rq->data;
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/*
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* get scatterlist from block layer
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*/
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n_elem = blk_rq_map_sg(lun->disk->queue, rq, &cmd->sgv[0]);
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if (n_elem < 0) {
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printk(KERN_INFO "%s: failed request map (%d)\n",
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sc->name, n_elem); /* P3 */
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return -1;
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}
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if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */
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printk(KERN_WARNING "%s: request with %d segments\n",
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sc->name, n_elem);
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return -1;
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}
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cmd->nsg = n_elem;
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sc->sg_stat[n_elem]++;
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memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
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cmd->cdb_len = rq->cmd_len;
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cmd->len = rq->data_len;
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return 0;
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@ -940,34 +903,33 @@ static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
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static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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{
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struct request *rq = cmd->back;
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struct ub_lun *lun = cmd->lun;
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struct ub_request *urq = cmd->back;
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struct request *rq;
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int uptodate;
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rq = urq->rq;
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if (cmd->error == 0) {
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uptodate = 1;
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if (blk_pc_request(rq)) {
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if (cmd->act_len >= rq->data_len)
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rq->data_len = 0;
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else
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rq->data_len -= cmd->act_len;
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}
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} else {
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uptodate = 0;
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if (blk_pc_request(rq)) {
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/* UB_SENSE_SIZE is smaller than SCSI_SENSE_BUFFERSIZE */
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memcpy(rq->sense, sc->top_sense, UB_SENSE_SIZE);
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rq->sense_len = UB_SENSE_SIZE;
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}
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if (cmd->error == 0)
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uptodate = 1;
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if (sc->top_sense[0] != 0)
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rq->errors = SAM_STAT_CHECK_CONDITION;
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else
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uptodate = 0;
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if (cmd->error == 0 && urq->current_sg+1 < urq->nsg) {
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if (ub_request_advance(sc, lun, urq, cmd) == 0) {
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/* Stay on target... */
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return;
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rq->errors = DID_ERROR << 16;
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}
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uptodate = 0;
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}
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urq->rq = NULL;
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ub_put_cmd(lun, cmd);
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ub_end_rq(rq, uptodate);
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blk_start_queue(lun->disk->queue);
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@ -982,40 +944,6 @@ static void ub_end_rq(struct request *rq, int uptodate)
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end_that_request_last(rq);
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}
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static int ub_request_advance(struct ub_dev *sc, struct ub_lun *lun,
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struct ub_request *urq, struct ub_scsi_cmd *cmd)
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{
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struct scatterlist *sg;
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unsigned int nblks;
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/* XXX This is temporary, until we sort out S/G in packet requests. */
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if (blk_pc_request(urq->rq)) {
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printk(KERN_WARNING
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"2-segment packet request completed\n"); /* P3 */
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return -1;
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}
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sg = &urq->sgv[urq->current_sg];
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nblks = sg->length >> (lun->capacity.bshift + 9);
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urq->current_block += nblks;
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urq->current_sg++;
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sg++;
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memset(cmd, 0, sizeof(struct ub_scsi_cmd));
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ub_scsi_build_block(lun, cmd, urq);
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cmd->state = UB_CMDST_INIT;
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cmd->lun = lun;
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cmd->done = ub_rw_cmd_done;
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cmd->back = &lun->urq;
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cmd->tag = sc->tagcnt++;
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if (ub_submit_scsi(sc, cmd) != 0) {
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return -1;
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}
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return 0;
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}
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/*
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* Submit a regular SCSI operation (not an auto-sense).
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*
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@ -1171,7 +1099,6 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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{
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struct urb *urb = &sc->work_urb;
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struct bulk_cs_wrap *bcs;
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int pipe;
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int rc;
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if (atomic_read(&sc->poison)) {
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@ -1272,38 +1199,13 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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goto Bad_End;
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}
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if (cmd->dir == UB_DIR_NONE) {
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if (cmd->dir == UB_DIR_NONE || cmd->nsg < 1) {
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ub_state_stat(sc, cmd);
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return;
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}
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UB_INIT_COMPLETION(sc->work_done);
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if (cmd->dir == UB_DIR_READ)
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pipe = sc->recv_bulk_pipe;
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else
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pipe = sc->send_bulk_pipe;
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sc->last_pipe = pipe;
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usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe,
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cmd->data, cmd->len, ub_urb_complete, sc);
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sc->work_urb.transfer_flags = URB_ASYNC_UNLINK;
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sc->work_urb.actual_length = 0;
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sc->work_urb.error_count = 0;
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sc->work_urb.status = 0;
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if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
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/* XXX Clear stalls */
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printk("ub: data #%d submit failed (%d)\n", cmd->tag, rc); /* P3 */
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ub_complete(&sc->work_done);
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ub_state_done(sc, cmd, rc);
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return;
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}
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sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT;
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add_timer(&sc->work_timer);
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cmd->state = UB_CMDST_DATA;
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ub_cmdtr_state(sc, cmd);
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// udelay(125); // usb-storage has this
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ub_data_start(sc, cmd);
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} else if (cmd->state == UB_CMDST_DATA) {
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if (urb->status == -EPIPE) {
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@ -1325,16 +1227,22 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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if (urb->status == -EOVERFLOW) {
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/*
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* A babble? Failure, but we must transfer CSW now.
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* XXX This is going to end in perpetual babble. Reset.
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*/
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cmd->error = -EOVERFLOW; /* A cheap trick... */
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} else {
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ub_state_stat(sc, cmd);
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return;
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}
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if (urb->status != 0)
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goto Bad_End;
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}
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cmd->act_len = urb->actual_length;
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cmd->act_len += urb->actual_length;
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ub_cmdtr_act_len(sc, cmd);
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if (++cmd->current_sg < cmd->nsg) {
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ub_data_start(sc, cmd);
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return;
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}
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ub_state_stat(sc, cmd);
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} else if (cmd->state == UB_CMDST_STAT) {
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@ -1467,6 +1375,46 @@ Bad_End: /* Little Excel is dead */
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ub_state_done(sc, cmd, -EIO);
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}
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/*
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* Factorization helper for the command state machine:
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* Initiate a data segment transfer.
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*/
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static void ub_data_start(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
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{
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struct scatterlist *sg = &cmd->sgv[cmd->current_sg];
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int pipe;
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int rc;
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UB_INIT_COMPLETION(sc->work_done);
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if (cmd->dir == UB_DIR_READ)
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pipe = sc->recv_bulk_pipe;
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else
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pipe = sc->send_bulk_pipe;
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sc->last_pipe = pipe;
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usb_fill_bulk_urb(&sc->work_urb, sc->dev, pipe,
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page_address(sg->page) + sg->offset, sg->length,
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ub_urb_complete, sc);
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sc->work_urb.transfer_flags = URB_ASYNC_UNLINK;
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sc->work_urb.actual_length = 0;
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sc->work_urb.error_count = 0;
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sc->work_urb.status = 0;
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if ((rc = usb_submit_urb(&sc->work_urb, GFP_ATOMIC)) != 0) {
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/* XXX Clear stalls */
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printk("ub: data #%d submit failed (%d)\n", cmd->tag, rc); /* P3 */
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ub_complete(&sc->work_done);
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ub_state_done(sc, cmd, rc);
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return;
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}
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sc->work_timer.expires = jiffies + UB_DATA_TIMEOUT;
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add_timer(&sc->work_timer);
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||||
|
||||
cmd->state = UB_CMDST_DATA;
|
||||
ub_cmdtr_state(sc, cmd);
|
||||
}
|
||||
|
||||
/*
|
||||
* Factorization helper for the command state machine:
|
||||
* Finish the command.
|
||||
|
|
@ -1552,6 +1500,7 @@ static void ub_state_stat_counted(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|||
static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
||||
{
|
||||
struct ub_scsi_cmd *scmd;
|
||||
struct scatterlist *sg;
|
||||
int rc;
|
||||
|
||||
if (cmd->cdb[0] == REQUEST_SENSE) {
|
||||
|
|
@ -1560,12 +1509,17 @@ static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
|
|||
}
|
||||
|
||||
scmd = &sc->top_rqs_cmd;
|
||||
memset(scmd, 0, sizeof(struct ub_scsi_cmd));
|
||||
scmd->cdb[0] = REQUEST_SENSE;
|
||||
scmd->cdb[4] = UB_SENSE_SIZE;
|
||||
scmd->cdb_len = 6;
|
||||
scmd->dir = UB_DIR_READ;
|
||||
scmd->state = UB_CMDST_INIT;
|
||||
scmd->data = sc->top_sense;
|
||||
scmd->nsg = 1;
|
||||
sg = &scmd->sgv[0];
|
||||
sg->page = virt_to_page(sc->top_sense);
|
||||
sg->offset = (unsigned int)sc->top_sense & (PAGE_SIZE-1);
|
||||
sg->length = UB_SENSE_SIZE;
|
||||
scmd->len = UB_SENSE_SIZE;
|
||||
scmd->lun = cmd->lun;
|
||||
scmd->done = ub_top_sense_done;
|
||||
|
|
@ -1628,7 +1582,7 @@ static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
|
|||
*/
|
||||
static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd)
|
||||
{
|
||||
unsigned char *sense = scmd->data;
|
||||
unsigned char *sense = sc->top_sense;
|
||||
struct ub_scsi_cmd *cmd;
|
||||
|
||||
/*
|
||||
|
|
@ -1920,6 +1874,7 @@ static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
|
|||
struct ub_capacity *ret)
|
||||
{
|
||||
struct ub_scsi_cmd *cmd;
|
||||
struct scatterlist *sg;
|
||||
char *p;
|
||||
enum { ALLOC_SIZE = sizeof(struct ub_scsi_cmd) + 8 };
|
||||
unsigned long flags;
|
||||
|
|
@ -1940,7 +1895,11 @@ static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
|
|||
cmd->cdb_len = 10;
|
||||
cmd->dir = UB_DIR_READ;
|
||||
cmd->state = UB_CMDST_INIT;
|
||||
cmd->data = p;
|
||||
cmd->nsg = 1;
|
||||
sg = &cmd->sgv[0];
|
||||
sg->page = virt_to_page(p);
|
||||
sg->offset = (unsigned int)p & (PAGE_SIZE-1);
|
||||
sg->length = 8;
|
||||
cmd->len = 8;
|
||||
cmd->lun = lun;
|
||||
cmd->done = ub_probe_done;
|
||||
|
|
|
|||
Loading…
Reference in New Issue