mtdchar: get rid of pointless access_ok()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 3568294..de8c902 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -375,12 +375,7 @@ static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
return -EINVAL;
if (!mtd->_write_oob)
- ret = -EOPNOTSUPP;
- else
- ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
-
- if (ret)
- return ret;
+ return -EOPNOTSUPP;
ops.ooblen = length;
ops.ooboffs = start & (mtd->writesize - 1);
@@ -419,9 +414,6 @@ static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
if (length > 4096)
return -EINVAL;
- if (!access_ok(VERIFY_WRITE, ptr, length))
- return -EFAULT;
-
ops.ooblen = length;
ops.ooboffs = start & (mtd->writesize - 1);
ops.datbuf = NULL;
@@ -618,9 +610,6 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
usr_data = (const void __user *)(uintptr_t)req.usr_data;
usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
- if (!access_ok(VERIFY_READ, usr_data, req.len) ||
- !access_ok(VERIFY_READ, usr_oob, req.ooblen))
- return -EFAULT;
if (!mtd->_write_oob)
return -EOPNOTSUPP;
@@ -662,21 +651,10 @@ static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
struct mtd_info *mtd = mfi->mtd;
void __user *argp = (void __user *)arg;
int ret = 0;
- u_long size;
struct mtd_info_user info;
pr_debug("MTD_ioctl\n");
- size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
- if (cmd & IOC_IN) {
- if (!access_ok(VERIFY_READ, argp, size))
- return -EFAULT;
- }
- if (cmd & IOC_OUT) {
- if (!access_ok(VERIFY_WRITE, argp, size))
- return -EFAULT;
- }
-
switch (cmd) {
case MEMGETREGIONCOUNT:
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))