From: NeilBrown <neilb@suse.de>
Date: Thu, 28 Oct 2010 06:30:21 +0000 (+1100)
Subject: md: remove md_mutex locking.
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=4b532c9b8c87eb8e51605c4d08dfb5139c758dc5;p=openwrt%2Fstaging%2Fblogic.git

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 <neilb@suse.de>
---

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 64f97168cefa..2399168b6315 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;
 }