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Date: Tue, 18 Nov 2008 21:16:00 +0100
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: linux-ide@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
Michael Schmitz <schmitz@...phys.uni-duesseldorf.de>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Elias Oltmanns <eo@...ensachen.de>
Subject: [PATCH 2/3] ide: add ide_[un]lock_hwgroup() helpers
Add ide_[un]lock_hwgroup() inline helpers for obtaining exclusive
access to the given hwgroup and update the core code accordingly.
[ This change besides making code saner results in more efficient
use of ide_{get,release}_lock(). ]
Cc: Michael Schmitz <schmitz@...phys.uni-duesseldorf.de>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Elias Oltmanns <eo@...ensachen.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
drivers/ide/ide-io.c | 32 +++++++++++---------------------
drivers/ide/ide-park.c | 2 +-
include/linux/ide.h | 20 ++++++++++++++++++++
3 files changed, 32 insertions(+), 22 deletions(-)
Index: b/drivers/ide/ide-io.c
===================================================================
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -790,10 +790,7 @@ void do_ide_request(struct request_queue
/* caller must own hwgroup->lock */
BUG_ON(!irqs_disabled());
- while (!hwgroup->busy) {
- hwgroup->busy = 1;
- /* for atari only */
- ide_get_lock(ide_intr, hwgroup);
+ while (!ide_lock_hwgroup(hwgroup)) {
drive = choose_drive(hwgroup);
if (drive == NULL) {
int sleeping = 0;
@@ -825,17 +822,10 @@ void do_ide_request(struct request_queue
hwgroup->sleeping = 1;
hwgroup->req_gen_timer = hwgroup->req_gen;
mod_timer(&hwgroup->timer, sleep);
- /* we purposely leave hwgroup->busy==1
+ /* we purposely leave hwgroup locked
* while sleeping */
- } else {
- /* Ugly, but how can we sleep for the lock
- * otherwise? perhaps from tq_disk?
- */
-
- /* for atari only */
- ide_release_lock();
- hwgroup->busy = 0;
- }
+ } else
+ ide_unlock_hwgroup(hwgroup);
/* no more work for this hwgroup (for now) */
goto plug_device;
@@ -865,7 +855,7 @@ void do_ide_request(struct request_queue
*/
rq = elv_next_request(drive->queue);
if (!rq) {
- hwgroup->busy = 0;
+ ide_unlock_hwgroup(hwgroup);
break;
}
@@ -885,8 +875,8 @@ void do_ide_request(struct request_queue
if ((drive->dev_flags & IDE_DFLAG_BLOCKED) &&
blk_pm_request(rq) == 0 &&
(rq->cmd_flags & REQ_PREEMPT) == 0) {
- /* We clear busy, there should be no pending ATA command at this point. */
- hwgroup->busy = 0;
+ /* there should be no pending command at this point */
+ ide_unlock_hwgroup(hwgroup);
goto plug_device;
}
@@ -897,7 +887,7 @@ void do_ide_request(struct request_queue
spin_lock_irq(&hwgroup->lock);
if (startstop == ide_stopped) {
- hwgroup->busy = 0;
+ ide_unlock_hwgroup(hwgroup);
if (!elv_queue_empty(orig_drive->queue))
blk_plug_device(orig_drive->queue);
}
@@ -1001,7 +991,7 @@ void ide_timer_expiry (unsigned long dat
*/
if (hwgroup->sleeping) {
hwgroup->sleeping = 0;
- hwgroup->busy = 0;
+ ide_unlock_hwgroup(hwgroup);
}
} else {
ide_drive_t *drive = hwgroup->drive;
@@ -1056,7 +1046,7 @@ void ide_timer_expiry (unsigned long dat
spin_lock_irq(&hwgroup->lock);
enable_irq(hwif->irq);
if (startstop == ide_stopped) {
- hwgroup->busy = 0;
+ ide_unlock_hwgroup(hwgroup);
if (!elv_queue_empty(drive->queue))
blk_plug_device(drive->queue);
}
@@ -1249,7 +1239,7 @@ irqreturn_t ide_intr (int irq, void *dev
drive->service_time = jiffies - drive->service_start;
if (startstop == ide_stopped) {
if (hwgroup->handler == NULL) { /* paranoia */
- hwgroup->busy = 0;
+ ide_unlock_hwgroup(hwgroup);
if (!elv_queue_empty(drive->queue))
blk_plug_device(drive->queue);
} else
Index: b/drivers/ide/ide-park.c
===================================================================
--- a/drivers/ide/ide-park.c
+++ b/drivers/ide/ide-park.c
@@ -22,7 +22,7 @@ static void issue_park_cmd(ide_drive_t *
if (reset_timer && hwgroup->sleeping &&
del_timer(&hwgroup->timer)) {
hwgroup->sleeping = 0;
- hwgroup->busy = 0;
+ ide_unlock_hwgroup(hwgroup);
blk_start_queueing(q);
}
spin_unlock_irq(&hwgroup->lock);
Index: b/include/linux/ide.h
===================================================================
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1280,6 +1280,26 @@ extern void ide_stall_queue(ide_drive_t
extern void ide_timer_expiry(unsigned long);
extern irqreturn_t ide_intr(int irq, void *dev_id);
+
+static inline int ide_lock_hwgroup(ide_hwgroup_t *hwgroup)
+{
+ if (hwgroup->busy)
+ return 1;
+
+ hwgroup->busy = 1;
+ /* for atari only */
+ ide_get_lock(ide_intr, hwgroup);
+
+ return 0;
+}
+
+static inline void ide_unlock_hwgroup(ide_hwgroup_t *hwgroup)
+{
+ /* for atari only */
+ ide_release_lock();
+ hwgroup->busy = 0;
+}
+
extern void do_ide_request(struct request_queue *);
void ide_init_disk(struct gendisk *, ide_drive_t *);
--
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