[PATCH] md: Convert reconfig_sem to reconfig_mutex

[NeilBrown]

... being careful that mutex_trylock is inverted wrt down_trylock

Signed-off-by: Neil Brown <neilb@xxxxxxx>

### Diffstat output
 ./drivers/md/md.c           |   14 +++++++-------
 ./include/linux/raid/md_k.h |    2 +-
 2 files changed, 8 insertions(+), 8 deletions(-)

diff ./drivers/md/md.c~current~ ./drivers/md/md.c
--- ./drivers/md/md.c~current~	2006-03-27 09:21:08.000000000 +1100
+++ ./drivers/md/md.c	2006-03-27 09:21:19.000000000 +1100
@@ -254,7 +254,7 @@ static mddev_t * mddev_find(dev_t unit)
 	else
 		new->md_minor = MINOR(unit) >> MdpMinorShift;
 
-	init_MUTEX(&new->reconfig_sem);
+	mutex_init(&new->reconfig_mutex);
 	INIT_LIST_HEAD(&new->disks);
 	INIT_LIST_HEAD(&new->all_mddevs);
 	init_timer(&new->safemode_timer);
@@ -276,22 +276,22 @@ static mddev_t * mddev_find(dev_t unit)
 
 static inline int mddev_lock(mddev_t * mddev)
 {
-	return down_interruptible(&mddev->reconfig_sem);
+	return mutex_lock_interruptible(&mddev->reconfig_mutex);
 }
 
 static inline void mddev_lock_uninterruptible(mddev_t * mddev)
 {
-	down(&mddev->reconfig_sem);
+	mutex_lock(&mddev->reconfig_mutex);
 }
 
 static inline int mddev_trylock(mddev_t * mddev)
 {
-	return down_trylock(&mddev->reconfig_sem);
+	return mutex_trylock(&mddev->reconfig_mutex);
 }
 
 static inline void mddev_unlock(mddev_t * mddev)
 {
-	up(&mddev->reconfig_sem);
+	mutex_unlock(&mddev->reconfig_mutex);
 
 	md_wakeup_thread(mddev->thread);
 }
@@ -4892,7 +4892,7 @@ void md_check_recovery(mddev_t *mddev)
 		))
 		return;
 
-	if (mddev_trylock(mddev)==0) {
+	if (mddev_trylock(mddev)) {
 		int spares =0;
 
 		spin_lock_irq(&mddev->write_lock);
@@ -5028,7 +5028,7 @@ static int md_notify_reboot(struct notif
 		printk(KERN_INFO "md: stopping all md devices.\n");
 
 		ITERATE_MDDEV(mddev,tmp)
-			if (mddev_trylock(mddev)==0)
+			if (mddev_trylock(mddev))
 				do_md_stop (mddev, 1);
 		/*
 		 * certain more exotic SCSI devices are known to be

diff ./include/linux/raid/md_k.h~current~ ./include/linux/raid/md_k.h
--- ./include/linux/raid/md_k.h~current~	2006-03-27 09:21:09.000000000 +1100
+++ ./include/linux/raid/md_k.h	2006-03-27 09:21:19.000000000 +1100
@@ -185,7 +185,7 @@ struct mddev_s
 	unsigned long			recovery;
 
 	int				in_sync;	/* know to not need resync */
-	struct semaphore		reconfig_sem;
+	struct mutex			reconfig_mutex;
 	atomic_t			active;
 
 	int				changed;	/* true if we might need to reread partition info */
-
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