[PATCH] cpuset: fix return without releasing semaphore

It is wrong to acquire the semaphore and then return from
cpuset_zone_allowed without releasing it.

Signed-off-by: Bob Picco <bob.picco@hp.com>
Acked-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 5a737ed..7430640 100644 (file)
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1809,11 +1809,12 @@ int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
        if (gfp_mask & __GFP_HARDWALL)  /* If hardwall request, stop here */
                return 0;
 
+       if (current->flags & PF_EXITING) /* Let dying task have memory */
+               return 1;
+
        /* Not hardwall and node outside mems_allowed: scan up cpusets */
        down(&callback_sem);
 
-       if (current->flags & PF_EXITING) /* Let dying task have memory */
-               return 1;
        task_lock(current);
        cs = nearest_exclusive_ancestor(current->cpuset);
        task_unlock(current);