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| author | Paul Mundt <lethal@linux-sh.org> | 2009-08-15 05:58:45 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2009-08-15 05:58:45 +0900 |
| commit | d2dcd9101b1a940ce8496601ba871e47f84881ec (patch) | |
| tree | 3de9cb11379d51eb01b568a20c8d7c585c89d10e /drivers/mtd/mtdblock.c | |
| parent | 8010fbe7a67c2f993cbb11b9d8b7e98528256dd1 (diff) | |
| parent | 606b4c992f3b28f906100f1b6eb49059909d8da7 (diff) | |
| download | linux-d2dcd9101b1a940ce8496601ba871e47f84881ec.tar.gz linux-d2dcd9101b1a940ce8496601ba871e47f84881ec.tar.xz | |
Merge branch 'master' into sh/cachetlb
Diffstat (limited to 'drivers/mtd/mtdblock.c')
| -rw-r--r-- | drivers/mtd/mtdblock.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c index 208c6faa0358..77db5ce24d92 100644 --- a/drivers/mtd/mtdblock.c +++ b/drivers/mtd/mtdblock.c @@ -29,6 +29,8 @@ static struct mtdblk_dev { enum { STATE_EMPTY, STATE_CLEAN, STATE_DIRTY } cache_state; } *mtdblks[MAX_MTD_DEVICES]; +static struct mutex mtdblks_lock; + /* * Cache stuff... * @@ -270,15 +272,19 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd) DEBUG(MTD_DEBUG_LEVEL1,"mtdblock_open\n"); + mutex_lock(&mtdblks_lock); if (mtdblks[dev]) { mtdblks[dev]->count++; + mutex_unlock(&mtdblks_lock); return 0; } /* OK, it's not open. Create cache info for it */ mtdblk = kzalloc(sizeof(struct mtdblk_dev), GFP_KERNEL); - if (!mtdblk) + if (!mtdblk) { + mutex_unlock(&mtdblks_lock); return -ENOMEM; + } mtdblk->count = 1; mtdblk->mtd = mtd; @@ -291,6 +297,7 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd) } mtdblks[dev] = mtdblk; + mutex_unlock(&mtdblks_lock); DEBUG(MTD_DEBUG_LEVEL1, "ok\n"); @@ -304,6 +311,8 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd) DEBUG(MTD_DEBUG_LEVEL1, "mtdblock_release\n"); + mutex_lock(&mtdblks_lock); + mutex_lock(&mtdblk->cache_mutex); write_cached_data(mtdblk); mutex_unlock(&mtdblk->cache_mutex); @@ -316,6 +325,9 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd) vfree(mtdblk->cache_data); kfree(mtdblk); } + + mutex_unlock(&mtdblks_lock); + DEBUG(MTD_DEBUG_LEVEL1, "ok\n"); return 0; @@ -376,6 +388,8 @@ static struct mtd_blktrans_ops mtdblock_tr = { static int __init init_mtdblock(void) { + mutex_init(&mtdblks_lock); + return register_mtd_blktrans(&mtdblock_tr); } |