ide: ide_hwgroup_t.rq doesn't need an ide_lock held
While at it:
- no need to check for hwgroup presence in ide_dump_opcode()
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 35b6258..8afe7b1 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -107,17 +107,10 @@
int ide_end_request (ide_drive_t *drive, int uptodate, int nr_sectors)
{
unsigned int nr_bytes = nr_sectors << 9;
- struct request *rq;
+ struct request *rq = drive->hwif->hwgroup->rq;
unsigned long flags;
int ret = 1;
- /*
- * room for locking improvements here, the calls below don't
- * need the queue lock held at all
- */
- spin_lock_irqsave(&ide_lock, flags);
- rq = HWGROUP(drive)->rq;
-
if (!nr_bytes) {
if (blk_pc_request(rq))
nr_bytes = rq->data_len;
@@ -125,9 +118,10 @@
nr_bytes = rq->hard_cur_sectors << 9;
}
+ spin_lock_irqsave(&ide_lock, flags);
ret = __ide_end_request(drive, rq, uptodate, nr_bytes, 1);
-
spin_unlock_irqrestore(&ide_lock, flags);
+
return ret;
}
EXPORT_SYMBOL(ide_end_request);
@@ -245,8 +239,9 @@
unsigned long flags;
int ret;
- spin_lock_irqsave(&ide_lock, flags);
BUG_ON(!blk_rq_started(rq));
+
+ spin_lock_irqsave(&ide_lock, flags);
ret = __ide_end_request(drive, rq, uptodate, nr_sectors << 9, 0);
spin_unlock_irqrestore(&ide_lock, flags);
@@ -278,7 +273,11 @@
drive->dev_flags &= ~IDE_DFLAG_BLOCKED;
blk_start_queue(drive->queue);
}
- HWGROUP(drive)->rq = NULL;
+ spin_unlock_irqrestore(&ide_lock, flags);
+
+ drive->hwif->hwgroup->rq = NULL;
+
+ spin_lock_irqsave(&ide_lock, flags);
if (__blk_end_request(rq, 0, 0))
BUG();
spin_unlock_irqrestore(&ide_lock, flags);
@@ -300,12 +299,9 @@
void ide_end_drive_cmd (ide_drive_t *drive, u8 stat, u8 err)
{
+ ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
+ struct request *rq = hwgroup->rq;
unsigned long flags;
- struct request *rq;
-
- spin_lock_irqsave(&ide_lock, flags);
- rq = HWGROUP(drive)->rq;
- spin_unlock_irqrestore(&ide_lock, flags);
if (rq->cmd_type == REQ_TYPE_ATA_TASKFILE) {
ide_task_t *task = (ide_task_t *)rq->special;
@@ -333,15 +329,16 @@
return;
}
- spin_lock_irqsave(&ide_lock, flags);
- HWGROUP(drive)->rq = NULL;
+ hwgroup->rq = NULL;
+
rq->errors = err;
+
+ spin_lock_irqsave(&ide_lock, flags);
if (unlikely(__blk_end_request(rq, (rq->errors ? -EIO : 0),
blk_rq_bytes(rq))))
BUG();
spin_unlock_irqrestore(&ide_lock, flags);
}
-
EXPORT_SYMBOL(ide_end_drive_cmd);
static void ide_kill_rq(ide_drive_t *drive, struct request *rq)
@@ -1489,11 +1486,12 @@
void ide_do_drive_cmd(ide_drive_t *drive, struct request *rq)
{
+ ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
unsigned long flags;
- ide_hwgroup_t *hwgroup = HWGROUP(drive);
+
+ hwgroup->rq = NULL;
spin_lock_irqsave(&ide_lock, flags);
- hwgroup->rq = NULL;
__elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
blk_start_queueing(drive->queue);
spin_unlock_irqrestore(&ide_lock, flags);