[PATCH] mtd cmdlinepart: allow zero offset value

[powerpc.git] / drivers / mtd / mtdblock.c

diff --git a/drivers/mtd/mtdblock.c b/drivers/mtd/mtdblock.c
index e847566..2cef280 100644 (file)
--- a/drivers/mtd/mtdblock.c
+++ b/drivers/mtd/mtdblock.c
@@ -19,11 +19,13 @@
 
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/blktrans.h>
+#include <linux/mutex.h>
+
 
 static struct mtdblk_dev {
        struct mtd_info *mtd;
        int count;
-       struct semaphore cache_sem;
+       struct mutex cache_mutex;
        unsigned char *cache_data;
        unsigned long cache_offset;
        unsigned int cache_size;
@@ -284,7 +286,7 @@ static int mtdblock_open(struct mtd_blktrans_dev *mbd)
        mtdblk->count = 1;
        mtdblk->mtd = mtd;
 
-       init_MUTEX (&mtdblk->cache_sem);
+       mutex_init(&mtdblk->cache_mutex);
        mtdblk->cache_state = STATE_EMPTY;
        if ((mtdblk->mtd->flags & MTD_CAP_RAM) != MTD_CAP_RAM &&
            mtdblk->mtd->erasesize) {
@@ -306,9 +308,9 @@ static int mtdblock_release(struct mtd_blktrans_dev *mbd)
 
        DEBUG(MTD_DEBUG_LEVEL1, "mtdblock_release\n");
 
-       down(&mtdblk->cache_sem);
+       mutex_lock(&mtdblk->cache_mutex);
        write_cached_data(mtdblk);
-       up(&mtdblk->cache_sem);
+       mutex_unlock(&mtdblk->cache_mutex);
 
        if (!--mtdblk->count) {
                /* It was the last usage. Free the device */
@@ -327,9 +329,9 @@ static int mtdblock_flush(struct mtd_blktrans_dev *dev)
 {
        struct mtdblk_dev *mtdblk = mtdblks[dev->devnum];
 
-       down(&mtdblk->cache_sem);
+       mutex_lock(&mtdblk->cache_mutex);
        write_cached_data(mtdblk);
-       up(&mtdblk->cache_sem);
+       mutex_unlock(&mtdblk->cache_mutex);
 
        if (mtdblk->mtd->sync)
                mtdblk->mtd->sync(mtdblk->mtd);