ieee1394: raw1394: add sparse annotations to raw1394_compat_write

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>

1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/ieee1394/raw1394.c b/drivers/ieee1394/raw1394.c
index 281229b027f5..9b71390b0a0b 100644
--- a/drivers/ieee1394/raw1394.c
+++ b/drivers/ieee1394/raw1394.c
@@ -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))
@@ -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
@@ -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) ||
@@ -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
@@ -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)) {