slub: Fix slub_lock down/up imbalance

There are two places, that do not release the slub_lock.

Respective bugs were introduced by sysfs changes ab4d5ed5 (slub: Enable
sysfs support for !CONFIG_SLUB_DEBUG) and 2bce6485 ( slub: Allow removal
of slab caches during boot).

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --git a/mm/slub.c b/mm/slub.c
index 8fd5401..981fb73 100644 (file)
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3273,9 +3273,9 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size,
                kfree(n);
                kfree(s);
        }
+err:
        up_write(&slub_lock);
 
-err:
        if (flags & SLAB_PANIC)
                panic("Cannot create slabcache %s\n", name);
        else
@@ -3862,6 +3862,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s,
                        x += sprintf(buf + x, " N%d=%lu",
                                        node, nodes[node]);
 #endif
+       up_read(&slub_lock);
        kfree(nodes);
        return x + sprintf(buf + x, "\n");
 }