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ide-taskfile: don't abuse rq->buffer 

Impact: rq->buffer usage cleanup

ide_raw_taskfile() directly uses rq->buffer to carry pointer to the
data buffer.  This complicates both block interface and ide backend
request handling.  Use blk_rq_map_kern() instead and drop special
handling for REQ_TYPE_ATA_TASKFILE from ide_map_sg().

Note that REQ_RW setting is moved upwards as blk_rq_map_kern() uses it
to initialize bio rw flag.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tejun Heo 2009-04-19 07:00:42 +09:00
parent 7f006dc24f
commit eace4cb04c
2 changed files with 12 additions and 11 deletions
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5
drivers/ide/ide-io.c
View File

@ -248,10 +248,7 @@ void ide_map_sg(ide_drive_t *drive, struct ide_cmd *cmd)
struct scatterlist *sg = hwif->sg_table;
struct request *rq = cmd->rq;
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
sg_init_one(sg, rq->buffer, rq->nr_sectors * SECTOR_SIZE);
cmd->sg_nents = 1;
} else if (!rq->bio) {
if (!rq->bio) {
sg_init_one(sg, rq->data, rq->data_len);
cmd->sg_nents = 1;
} else

18
drivers/ide/ide-taskfile.c
View File

@ -424,7 +424,9 @@ int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf,
rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
rq->buffer = buf;
if (cmd->tf_flags & IDE_TFLAG_WRITE)
rq->cmd_flags |= REQ_RW;
/*
* (ks) We transfer currently only whole sectors.
@ -432,18 +434,20 @@ int ide_raw_taskfile(ide_drive_t *drive, struct ide_cmd *cmd, u8 *buf,
* if we would find a solution to transfer any size.
* To support special commands like READ LONG.
*/
rq->hard_nr_sectors = rq->nr_sectors = nsect;
rq->hard_cur_sectors = rq->current_nr_sectors = nsect;
if (cmd->tf_flags & IDE_TFLAG_WRITE)
rq->cmd_flags |= REQ_RW;
if (nsect) {
error = blk_rq_map_kern(drive->queue, rq, buf,
nsect * SECTOR_SIZE, __GFP_WAIT);
if (error)
goto put_req;
}
rq->special = cmd;
cmd->rq = rq;
error = blk_execute_rq(drive->queue, NULL, rq, 0);
blk_put_request(rq);
put_req:
blk_put_request(rq);
return error;
}