From: K. Y. Srinivasan <kys@microsoft.com>
Date: Tue, 10 May 2011 14:53:47 +0000 (-0700)
Subject: Staging: hv: Get rid of blkvsc_mutex
X-Git-Tag: v3.0-rc1~336^2~433
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c56624988dabc11ae9872159401d1fca7e597f18;p=karo-tx-linux.git

Staging: hv: Get rid of blkvsc_mutex

The blkvsc_mutex is unnecessary as the state it is protecting
(blkdev->users) is already protected by the spin lock.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index db44cf683a03..cfef1c0bfb39 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -27,7 +27,6 @@
 #include <linux/major.h>
 #include <linux/delay.h>
 #include <linux/hdreg.h>
-#include <linux/mutex.h>
 #include <linux/slab.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -113,8 +112,6 @@ struct block_device_context {
 	int users;
 };
 
-static DEFINE_MUTEX(blkvsc_mutex);
-
 static const char *g_blk_driver_name = "blkvsc";
 
 /* {32412632-86cb-44a2-9b5c-50d1417354f5} */
@@ -620,7 +617,6 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
 {
 	struct block_device_context *blkdev = disk->private_data;
 
-	mutex_lock(&blkvsc_mutex);
 	spin_lock(&blkdev->lock);
 	if (blkdev->users == 1) {
 		spin_unlock(&blkdev->lock);
@@ -631,7 +627,6 @@ static int blkvsc_release(struct gendisk *disk, fmode_t mode)
 	blkdev->users--;
 
 	spin_unlock(&blkdev->lock);
-	mutex_unlock(&blkvsc_mutex);
 	return 0;
 }