From: Konrad Rzeszutek Wilk Date: Wed, 25 Nov 2015 18:20:14 +0000 (-0500) Subject: xen/blkback: Free resources if connect_ring failed. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=2d0382fac17cef20d507a0211b82e0942b2ab271;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git xen/blkback: Free resources if connect_ring failed. With the multi-queue support we could fail at setting up some of the rings and fail the connection. That meant that all resources tied to rings[0..n-1] (where n is the ring that failed to be setup). Eventually the frontend will switch to the states and we will call xen_blkif_disconnect. However we do not want to be at the mercy of the frontend deciding when to change states. This allows us to do the cleanup right away and freeing resources. Signed-off-by: Konrad Rzeszutek Wilk --- diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c index ca3a414de11c..c92b35882720 100644 --- a/drivers/block/xen-blkback/xenbus.c +++ b/drivers/block/xen-blkback/xenbus.c @@ -749,8 +749,14 @@ static void frontend_changed(struct xenbus_device *dev, } err = connect_ring(be); - if (err) + if (err) { + /* + * Clean up so that memory resources can be used by + * other devices. connect_ring reported already error. + */ + xen_blkif_disconnect(be->blkif); break; + } xen_update_blkif_status(be->blkif); break;