ide: convert to blk-mq
ide-disk and ide-cd tested as working just fine, ide-tape and
ide-floppy haven't. But the latter don't require changes, so they
should work without issue.
Add helper function to insert a request from a work queue, since we
cannot invoke the blk-mq request insertion from IRQ context.
Cc: David Miller <davem@davemloft.net>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 8b2b72b..33210bc 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -172,8 +172,8 @@ EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
void ide_prep_sense(ide_drive_t *drive, struct request *rq)
{
struct request_sense *sense = &drive->sense_data;
- struct request *sense_rq = drive->sense_rq;
- struct scsi_request *req = scsi_req(sense_rq);
+ struct request *sense_rq;
+ struct scsi_request *req;
unsigned int cmd_len, sense_len;
int err;
@@ -196,9 +196,16 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
if (ata_sense_request(rq) || drive->sense_rq_armed)
return;
+ sense_rq = drive->sense_rq;
+ if (!sense_rq) {
+ sense_rq = blk_mq_alloc_request(drive->queue, REQ_OP_DRV_IN,
+ BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
+ drive->sense_rq = sense_rq;
+ }
+ req = scsi_req(sense_rq);
+
memset(sense, 0, sizeof(*sense));
- blk_rq_init(rq->q, sense_rq);
scsi_req_init(req);
err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
@@ -207,6 +214,8 @@ void ide_prep_sense(ide_drive_t *drive, struct request *rq)
if (printk_ratelimit())
printk(KERN_WARNING PFX "%s: failed to map sense "
"buffer\n", drive->name);
+ blk_mq_free_request(sense_rq);
+ drive->sense_rq = NULL;
return;
}
@@ -226,6 +235,8 @@ EXPORT_SYMBOL_GPL(ide_prep_sense);
int ide_queue_sense_rq(ide_drive_t *drive, void *special)
{
+ struct request *sense_rq = drive->sense_rq;
+
/* deferred failure from ide_prep_sense() */
if (!drive->sense_rq_armed) {
printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
@@ -233,12 +244,12 @@ int ide_queue_sense_rq(ide_drive_t *drive, void *special)
return -ENOMEM;
}
- drive->sense_rq->special = special;
+ sense_rq->special = special;
drive->sense_rq_armed = false;
drive->hwif->rq = NULL;
- elv_add_request(drive->queue, drive->sense_rq, ELEVATOR_INSERT_FRONT);
+ ide_insert_request_head(drive, sense_rq);
return 0;
}
EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
@@ -270,10 +281,8 @@ void ide_retry_pc(ide_drive_t *drive)
*/
drive->hwif->rq = NULL;
ide_requeue_and_plug(drive, failed_rq);
- if (ide_queue_sense_rq(drive, pc)) {
- blk_start_request(failed_rq);
+ if (ide_queue_sense_rq(drive, pc))
ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(failed_rq));
- }
}
EXPORT_SYMBOL_GPL(ide_retry_pc);