From: Pavel Emelyanov <xemul@parallels.com>
Date: Thu, 28 Oct 2010 09:50:37 +0000 (+0400)
Subject: slub: Fix slub_lock down/up imbalance
X-Git-Tag: Ubuntu-5.0.0-8.9~21063^2
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=68cee4f118c21a1c67e5764a91d766661db5b360;p=mirror_ubuntu-disco-kernel.git

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 8fd5401bb071..981fb730aa04 100644
--- 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");
 }