From 4b532c9b8c87eb8e51605c4d08dfb5139c758dc5 Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Thu, 28 Oct 2010 17:30:21 +1100 Subject: [PATCH] md: remove md_mutex locking. lock_kernel calls were recently pushed down into open/release functions. md doesn't need that protection. Then the BKL calls were change to md_mutex. We don't need those either. So remove it all. Signed-off-by: NeilBrown --- drivers/md/md.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/drivers/md/md.c b/drivers/md/md.c index 64f97168cef..2399168b631 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -57,8 +57,6 @@ #define DEBUG 0 #define dprintk(x...) ((void)(DEBUG && printk(x))) -static DEFINE_MUTEX(md_mutex); - #ifndef MODULE static void autostart_arrays(int part); #endif @@ -5887,7 +5885,6 @@ static int md_open(struct block_device *bdev, fmode_t mode) mddev_t *mddev = mddev_find(bdev->bd_dev); int err; - mutex_lock(&md_mutex); if (mddev->gendisk != bdev->bd_disk) { /* we are racing with mddev_put which is discarding this * bd_disk. @@ -5896,7 +5893,6 @@ static int md_open(struct block_device *bdev, fmode_t mode) /* Wait until bdev->bd_disk is definitely gone */ flush_scheduled_work(); /* Then retry the open from the top */ - mutex_unlock(&md_mutex); return -ERESTARTSYS; } BUG_ON(mddev != bdev->bd_disk->private_data); @@ -5910,7 +5906,6 @@ static int md_open(struct block_device *bdev, fmode_t mode) check_disk_size_change(mddev->gendisk, bdev); out: - mutex_unlock(&md_mutex); return err; } @@ -5919,10 +5914,8 @@ static int md_release(struct gendisk *disk, fmode_t mode) mddev_t *mddev = disk->private_data; BUG_ON(!mddev); - mutex_lock(&md_mutex); atomic_dec(&mddev->openers); mddev_put(mddev); - mutex_unlock(&md_mutex); return 0; }