diff options
| author | Wu Fengguang <fengguang.wu@intel.com> | 2009-12-15 02:58:08 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-12-15 17:53:11 +0100 |
| commit | fa29e97bb8c70fd7f564acbed3422403cee10ab7 (patch) | |
| tree | 150cd820e3db75b513cc87e4a9061e35ef5346ac | |
| parent | /dev/mem: introduce size_inside_page() (diff) | |
| download | linux-fa29e97bb8c70fd7f564acbed3422403cee10ab7.tar.xz linux-fa29e97bb8c70fd7f564acbed3422403cee10ab7.zip | |
/dev/mem: cleanup unxlate_dev_mem_ptr() calls
No behaviour change.
[akpm@linux-foundation.org: cleanuplets]
[akpm@linux-foundation.org: remove unused `ret']
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/char/mem.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index aaa9c24d4c14..c6b2fbc5ed47 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -154,6 +154,8 @@ static ssize_t read_mem(struct file * file, char __user * buf, #endif while (count > 0) { + unsigned long remaining; + sz = size_inside_page(p, count); if (!range_is_allowed(p >> PAGE_SHIFT, count)) @@ -168,12 +170,10 @@ static ssize_t read_mem(struct file * file, char __user * buf, if (!ptr) return -EFAULT; - if (copy_to_user(buf, ptr, sz)) { - unxlate_dev_mem_ptr(p, ptr); - return -EFAULT; - } - + remaining = copy_to_user(buf, ptr, sz); unxlate_dev_mem_ptr(p, ptr); + if (remaining) + return -EFAULT; buf += sz; p += sz; @@ -231,16 +231,14 @@ static ssize_t write_mem(struct file * file, const char __user * buf, } copied = copy_from_user(ptr, buf, sz); + unxlate_dev_mem_ptr(p, ptr); if (copied) { written += sz - copied; - unxlate_dev_mem_ptr(p, ptr); if (written) break; return -EFAULT; } - unxlate_dev_mem_ptr(p, ptr); - buf += sz; p += sz; count -= sz; |