[MTD] mtdchar.c silence sparse warning

The copy_to_user was casting away the address space to get the offset of
the length member.  Use offsetof() instead and add it to the void __user
*argp.

drivers/mtd/mtdchar.c:527:23: warning: cast removes address space of expression
drivers/mtd/mtdchar.c:527:23: warning: incorrect type in argument 1 (different address spaces)
drivers/mtd/mtdchar.c:527:23:    expected void [noderef] <asn:1>*to
drivers/mtd/mtdchar.c:527:23:    got unsigned int *<noident>

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 4b3156f9b36f..5fc2c4216c03 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -479,6 +479,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
         {
                 struct mtd_oob_buf buf;
                 struct mtd_oob_ops ops;
+                struct mtd_oob_buf __user *user_buf = argp;
                 uint32_t retlen;
 
                 if(!(file->f_mode & 2))
@@ -522,8 +523,7 @@ static int mtd_ioctl(struct inode *inode, struct file *file,
                 if (ops.oobretlen > 0xFFFFFFFFU)
                         ret = -EOVERFLOW;
                 retlen = ops.oobretlen;
-                if (copy_to_user(&((struct mtd_oob_buf *)argp)->length,
-                                 &retlen, sizeof(buf.length)))
+                if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
                         ret = -EFAULT;
 
                 kfree(ops.oobbuf);