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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>
This commit is contained in:
Gu Zheng 2014-12-03 10:19:52 +08:00 committed by Brian Norris
parent 0b56d2d45e
commit 362376a7c6
1 changed files with 0 additions and 10 deletions
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10
drivers/mtd/mtdblock.c
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@ -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");
}