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Date: Wed, 08 Oct 2008 22:30:02 +0200
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: linux-ide@...r.kernel.org
Cc: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/7] ide: ide_hwgroup_t.rq doesn't need an ide_lock held
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: [PATCH] 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@...il.com>
---
drivers/ide/ide-cd.c | 12 ++++++++----
drivers/ide/ide-io.c | 40 +++++++++++++++++++---------------------
drivers/ide/ide-lib.c | 7 +------
3 files changed, 28 insertions(+), 31 deletions(-)
Index: b/drivers/ide/ide-cd.c
===================================================================
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -317,7 +317,8 @@ static void ide_dump_status_no_sense(ide
static int cdrom_decode_status(ide_drive_t *drive, int good_stat, int *stat_ret)
{
ide_hwif_t *hwif = drive->hwif;
- struct request *rq = hwif->hwgroup->rq;
+ ide_hwgroup_t *hwgroup = hwif->hwgroup;
+ struct request *rq = hwgroup->rq;
int stat, err, sense_key;
/* check for errors */
@@ -508,9 +509,10 @@ end_request:
spin_lock_irqsave(&ide_lock, flags);
blkdev_dequeue_request(rq);
- HWGROUP(drive)->rq = NULL;
spin_unlock_irqrestore(&ide_lock, flags);
+ hwgroup->rq = NULL;
+
cdrom_queue_request_sense(drive, rq->sense, rq);
} else
cdrom_end_request(drive, 0);
@@ -950,7 +952,8 @@ static int cdrom_newpc_intr_dummy_cb(str
static ide_startstop_t cdrom_newpc_intr(ide_drive_t *drive)
{
ide_hwif_t *hwif = drive->hwif;
- struct request *rq = HWGROUP(drive)->rq;
+ ide_hwgroup_t *hwgroup = hwif->hwgroup;
+ struct request *rq = hwgroup->rq;
xfer_func_t *xferfunc;
ide_expiry_t *expiry = NULL;
int dma_error = 0, dma, stat, thislen, uptodate = 0;
@@ -1157,8 +1160,9 @@ end_request:
spin_lock_irqsave(&ide_lock, flags);
if (__blk_end_request(rq, 0, dlen))
BUG();
- HWGROUP(drive)->rq = NULL;
spin_unlock_irqrestore(&ide_lock, flags);
+
+ hwgroup->rq = NULL;
} else {
if (!uptodate)
rq->cmd_flags |= REQ_FAILED;
Index: b/drivers/ide/ide-io.c
===================================================================
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -107,17 +107,10 @@ static int __ide_end_request(ide_drive_t
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 @@ int ide_end_request (ide_drive_t *drive,
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);
@@ -241,8 +235,9 @@ int ide_end_dequeued_request(ide_drive_t
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);
@@ -274,7 +269,11 @@ static void ide_complete_pm_request (ide
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);
@@ -296,12 +295,9 @@ static void ide_complete_pm_request (ide
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;
@@ -332,15 +328,16 @@ void ide_end_drive_cmd (ide_drive_t *dri
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 @@ out:
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);
- spin_lock_irqsave(&ide_lock, flags);
hwgroup->rq = NULL;
+
+ spin_lock_irqsave(&ide_lock, flags);
__elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 1);
__generic_unplug_device(drive->queue);
spin_unlock_irqrestore(&ide_lock, flags);
Index: b/drivers/ide/ide-lib.c
===================================================================
--- a/drivers/ide/ide-lib.c
+++ b/drivers/ide/ide-lib.c
@@ -277,14 +277,9 @@ int ide_set_xfer_rate(ide_drive_t *drive
static void ide_dump_opcode(ide_drive_t *drive)
{
- struct request *rq;
+ struct request *rq = drive->hwif->hwgroup->rq;
ide_task_t *task = NULL;
- spin_lock(&ide_lock);
- rq = NULL;
- if (HWGROUP(drive))
- rq = HWGROUP(drive)->rq;
- spin_unlock(&ide_lock);
if (!rq)
return;
--
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