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[MTD] mtdchar.c silence sparse warning

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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>
This commit is contained in:
Harvey Harrison 2008-07-03 23:40:13 -07:00 committed by David Woodhouse
parent 7228982442
commit 5f6928378b
1 changed files with 2 additions and 2 deletions
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4
drivers/mtd/mtdchar.c
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@ -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);