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ieee1394: raw1394: add sparse annotations to raw1394_compat_write
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Eliminate the following warnings in raw1394_compat_write()'s error
return path, seen on x86-64 with CONFIG_COMPAT=y:

drivers/ieee1394/raw1394.c:381:17: warning: incorrect type in return expression (different address spaces)
drivers/ieee1394/raw1394.c:381:17:    expected char const [noderef] <asn:1>*
drivers/ieee1394/raw1394.c:381:17:    got void *
drivers/ieee1394/raw1394.c:2252:14: warning: incorrect type in argument 1 (different address spaces)
drivers/ieee1394/raw1394.c:2252:14:    expected void const *ptr
drivers/ieee1394/raw1394.c:2252:14:    got char const [noderef] <asn:1>*[assigned] buffer
drivers/ieee1394/raw1394.c:2253:19: warning: incorrect type in argument 1 (different address spaces)
drivers/ieee1394/raw1394.c:2253:19:    expected void const *ptr
drivers/ieee1394/raw1394.c:2253:19:    got char const [noderef] <asn:1>*[assigned] buffer

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Stefan Richter committed Mar 24, 2009
1 parent 1c4fb57 commit 4216968
Showing 1 changed file with 7 additions and 3 deletions.
10 changes: 7 additions & 3 deletions drivers/ieee1394/raw1394.c
Original file line number Diff line number Diff line change
Expand Up @@ -369,6 +369,7 @@ static const char __user *raw1394_compat_write(const char __user *buf)
{
struct compat_raw1394_req __user *cr = (typeof(cr)) buf;
struct raw1394_request __user *r;

r = compat_alloc_user_space(sizeof(struct raw1394_request));

#define C(x) __copy_in_user(&r->x, &cr->x, sizeof(r->x))
Expand All @@ -378,7 +379,8 @@ static const char __user *raw1394_compat_write(const char __user *buf)
C(tag) ||
C(sendb) ||
C(recvb))
return ERR_PTR(-EFAULT);
return (__force const char __user *)ERR_PTR(-EFAULT);

return (const char __user *)r;
}
#undef C
Expand All @@ -389,6 +391,7 @@ static int
raw1394_compat_read(const char __user *buf, struct raw1394_request *r)
{
struct compat_raw1394_req __user *cr = (typeof(cr)) buf;

if (!access_ok(VERIFY_WRITE, cr, sizeof(struct compat_raw1394_req)) ||
P(type) ||
P(error) ||
Expand All @@ -400,6 +403,7 @@ raw1394_compat_read(const char __user *buf, struct raw1394_request *r)
P(sendb) ||
P(recvb))
return -EFAULT;

return sizeof(struct compat_raw1394_req);
}
#undef P
Expand Down Expand Up @@ -2249,8 +2253,8 @@ static ssize_t raw1394_write(struct file *file, const char __user * buffer,
sizeof(struct compat_raw1394_req) !=
sizeof(struct raw1394_request)) {
buffer = raw1394_compat_write(buffer);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
if (IS_ERR((__force void *)buffer))
return PTR_ERR((__force void *)buffer);
} else
#endif
if (count != sizeof(struct raw1394_request)) {
Expand Down

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