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authorMatt Rushton <mrushton@amazon.com>2014-02-04 11:26:12 +0100
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2014-02-07 12:58:18 -0500
commit2ed22e3c3bec5b92b9aba4afdef0cc5e6d859a11 (patch)
tree2f8931eda57be083e4270279f37d7781591bbd48 /drivers/block/xen-blkback
parent802eee95bde72fd0cd0f3a5b2098375a487d1eda (diff)
xen-blkback: fix memory leak when persistent grants are used
Currently shrink_free_pagepool() is called before the pages used for persistent grants are released via free_persistent_gnts(). This results in a memory leak when a VBD that uses persistent grants is torn down. Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: "Roger Pau Monné" <roger.pau@citrix.com> Cc: Ian Campbell <Ian.Campbell@citrix.com> Reviewed-by: David Vrabel <david.vrabel@citrix.com> Cc: linux-kernel@vger.kernel.org Cc: xen-devel@lists.xen.org Cc: Anthony Liguori <aliguori@amazon.com> Signed-off-by: Matt Rushton <mrushton@amazon.com> Signed-off-by: Matt Wilson <msw@amazon.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/block/xen-blkback')
-rw-r--r--drivers/block/xen-blkback/blkback.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 6620b73d0490..30ef7b390df5 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -625,9 +625,6 @@ purge_gnt_list:
print_stats(blkif);
}
- /* Since we are shutting down remove all pages from the buffer */
- shrink_free_pagepool(blkif, 0 /* All */);
-
/* Free all persistent grant pages */
if (!RB_EMPTY_ROOT(&blkif->persistent_gnts))
free_persistent_gnts(blkif, &blkif->persistent_gnts,
@@ -636,6 +633,9 @@ purge_gnt_list:
BUG_ON(!RB_EMPTY_ROOT(&blkif->persistent_gnts));
blkif->persistent_gnt_c = 0;
+ /* Since we are shutting down remove all pages from the buffer */
+ shrink_free_pagepool(blkif, 0 /* All */);
+
if (log_stats)
print_stats(blkif);