aboutsummaryrefslogtreecommitdiff
path: root/drivers/mtd/mtdchar.c
diff options
context:
space:
mode:
authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-15 15:44:51 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2008-07-15 15:44:51 +1000
commit43d2548bb2ef7e6d753f91468a746784041e522d (patch)
tree77d13fcd48fd998393abb825ec36e2b732684a73 /drivers/mtd/mtdchar.c
parent585583d95c5660973bc0cf64add517b040acd8a4 (diff)
parent85082fd7cbe3173198aac0eb5e85ab1edcc6352c (diff)
Merge commit '85082fd7cbe3173198aac0eb5e85ab1edcc6352c' into test-build
Manual fixup of: arch/powerpc/Kconfig
Diffstat (limited to 'drivers/mtd/mtdchar.c')
-rw-r--r--drivers/mtd/mtdchar.c22
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 5d3ac512ce1..129d429cd2d 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/sched.h>
+#include <linux/smp_lock.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/compatmac.h>
@@ -86,6 +87,7 @@ static int mtd_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
int devnum = minor >> 1;
+ int ret = 0;
struct mtd_info *mtd;
struct mtd_file_info *mfi;
@@ -98,31 +100,39 @@ static int mtd_open(struct inode *inode, struct file *file)
if ((file->f_mode & 2) && (minor & 1))
return -EACCES;
+ lock_kernel();
mtd = get_mtd_device(NULL, devnum);
- if (IS_ERR(mtd))
- return PTR_ERR(mtd);
+ if (IS_ERR(mtd)) {
+ ret = PTR_ERR(mtd);
+ goto out;
+ }
if (MTD_ABSENT == mtd->type) {
put_mtd_device(mtd);
- return -ENODEV;
+ ret = -ENODEV;
+ goto out;
}
/* You can't open it RW if it's not a writeable device */
if ((file->f_mode & 2) && !(mtd->flags & MTD_WRITEABLE)) {
put_mtd_device(mtd);
- return -EACCES;
+ ret = -EACCES;
+ goto out;
}
mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
if (!mfi) {
put_mtd_device(mtd);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out;
}
mfi->mtd = mtd;
file->private_data = mfi;
- return 0;
+out:
+ unlock_kernel();
+ return ret;
} /* mtd_open */
/*====================================================================*/