diff options
| author | Wu Fengguang <fengguang.wu@intel.com> | 2010-02-02 22:44:06 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-02-03 03:11:22 +0100 |
| commit | c85e9a97c4102ce2e83112da850d838cfab5ab13 (patch) | |
| tree | 7c3216be064c82eb2c7793d3d078d45a3bfc6f4c /drivers/char | |
| parent | devmem: check vmalloc address on kmem read/write (diff) | |
| download | linux-c85e9a97c4102ce2e83112da850d838cfab5ab13.tar.xz linux-c85e9a97c4102ce2e83112da850d838cfab5ab13.zip | |
devmem: fix kmem write bug on memory holes
write_kmem() used to assume vwrite() always return the full buffer length.
However now vwrite() could return 0 to indicate memory hole. This
creates a bug that "buf" is not advanced accordingly.
Fix it to simply ignore the return value, hence the memory hole.
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Tejun Heo <tj@kernel.org>
Cc: Nick Piggin <npiggin@suse.de>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/mem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c index 1fd4b110d815..48788db4e280 100644 --- a/drivers/char/mem.c +++ b/drivers/char/mem.c @@ -555,7 +555,7 @@ static ssize_t write_kmem(struct file * file, const char __user * buf, err = -EFAULT; break; } - sz = vwrite(kbuf, (char *)p, sz); + vwrite(kbuf, (char *)p, sz); count -= sz; buf += sz; virtr += sz; |