mtd: mtdblock: remove the needless mtdblks_lock

The global lock mtdblks_lock was used to protect the original mtdblks
array to avoid race conditions. As the mtdblks array was already gone,
but the mtdblks_lock is left, and it causes latency when open/release dev.
So we need to remove it here.

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 0 insertions, 10 deletions

diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index 485ea751c7f9..bb4c14f83c75 100644
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -45,8 +45,6 @@ struct mtdblk_dev {
         enum { STATE_EMPTY, STATE_CLEAN, STATE_DIRTY } cache_state;
 };
 
-static DEFINE_MUTEX(mtdblks_lock);
-
 /*
  * Cache stuff...
  *
@@ -286,10 +284,8 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd)
 
         pr_debug("mtdblock_open\n");
 
-        mutex_lock(&mtdblks_lock);
         if (mtdblk->count) {
                 mtdblk->count++;
-                mutex_unlock(&mtdblks_lock);
                 return 0;
         }
 
@@ -302,8 +298,6 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd)
                 mtdblk->cache_data = NULL;
         }
 
-        mutex_unlock(&mtdblks_lock);
-
         pr_debug("ok\n");
 
         return 0;
@@ -315,8 +309,6 @@ static void mtdblock_release(struct mtd_blktrans_dev *mbd)
 
         pr_debug("mtdblock_release\n");
 
-        mutex_lock(&mtdblks_lock);
-
         mutex_lock(&mtdblk->cache_mutex);
         write_cached_data(mtdblk);
         mutex_unlock(&mtdblk->cache_mutex);
@@ -331,8 +323,6 @@ static void mtdblock_release(struct mtd_blktrans_dev *mbd)
                 vfree(mtdblk->cache_data);
         }
 
-        mutex_unlock(&mtdblks_lock);
-
         pr_debug("ok\n");
 }