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libata-scsi: Remove !use_sg code paths 

This is a minimal patch needed to remove use of !use_sg
     but it is not a complete clean up of the !use_sg paths.
     Libata-core still has the qc->flags & ATA_QCFLAG_SG
     and !qc->n_elem code paths. Perhaps an ata maintainer
     would have a go at it.

     - TODO: further cleanup of qc->flags & ATA_QCFLAG_SG
       and !qc->n_elem code paths in libata-core
     - TODO: Use scsi_dma_{map,unmap} where applicable.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Boaz Harrosh 2007-09-18 17:46:12 +02:00 committed by Jeff Garzik
parent d2a84f4789
commit e10b8c3f5f
1 changed files with 9 additions and 22 deletions
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25
drivers/ata/libata-scsi.c
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@ -450,13 +450,8 @@ static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
qc->scsicmd = cmd;
qc->scsidone = done;
if (cmd->use_sg) {
qc->__sg = (struct scatterlist *) cmd->request_buffer;
qc->n_elem = cmd->use_sg;
} else if (cmd->request_bufflen) {
qc->__sg = &qc->sgent;
qc->n_elem = 1;
}
} else {
cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
done(cmd);
@ -1504,11 +1499,7 @@ static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
goto err_did;
}
if (cmd->use_sg)
ata_sg_init(qc, cmd->request_buffer, cmd->use_sg);
else
ata_sg_init_one(qc, cmd->request_buffer,
cmd->request_bufflen);
qc->dma_dir = cmd->sc_data_direction;
}
@ -1562,15 +1553,14 @@ static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
u8 *buf;
unsigned int buflen;
if (cmd->use_sg) {
struct scatterlist *sg;
struct scatterlist *sg = (struct scatterlist *) cmd->request_buffer;
sg = (struct scatterlist *) cmd->request_buffer;
if (sg) {
buf = kmap_atomic(sg->page, KM_IRQ0) + sg->offset;
buflen = sg->length;
} else {
buf = cmd->request_buffer;
buflen = cmd->request_bufflen;
buf = NULL;
buflen = 0;
}
*buf_out = buf;
@ -1590,12 +1580,9 @@ static unsigned int ata_scsi_rbuf_get(struct scsi_cmnd *cmd, u8 **buf_out)
static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, u8 *buf)
{
if (cmd->use_sg) {
struct scatterlist *sg;
sg = (struct scatterlist *) cmd->request_buffer;
struct scatterlist *sg = (struct scatterlist *) cmd->request_buffer;
if (sg)
kunmap_atomic(buf - sg->offset, KM_IRQ0);
}
}
/**