From: Matt Rushton Date: Tue, 4 Feb 2014 10:26:12 +0000 (+0100) Subject: xen-blkback: fix memory leak when persistent grants are used X-Git-Tag: v3.14-rc3~22^2~5^2~4 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2ed22e3c3bec5b92b9aba4afdef0cc5e6d859a11;p=karo-tx-linux.git 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 Cc: "Roger Pau Monné" Cc: Ian Campbell Reviewed-by: David Vrabel Cc: linux-kernel@vger.kernel.org Cc: xen-devel@lists.xen.org Cc: Anthony Liguori Signed-off-by: Matt Rushton Signed-off-by: Matt Wilson Signed-off-by: Konrad Rzeszutek Wilk --- 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);