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@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
---
drivers/ide/ide-io.c | 5 +----
drivers/ide/ide-taskfile.c | 18 +++++++++++-------
2 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 0321278..c2e622f 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -244,10 +244,7 @@ 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
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 243421c..4e0d66f 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -396,7 +396,9 @@ 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.
@@ -404,18 +406,20 @@ 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;
}
--
1.6.0.2
--
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