From: David Vrabel <david.vrabel@citrix.com>
Date: Tue, 2 Sep 2014 14:21:29 +0000 (+0100)
Subject: xen/gntalloc: fix oops after runnning out of grant refs
X-Git-Tag: fixes-for-v3.18-merge-window~146^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e9de2e5fd602c4f5ddf212d3837b19ad4f5878ad;p=pandora-kernel.git

xen/gntalloc: fix oops after runnning out of grant refs

Only set gref->gref_id if foreign access was successfully granted and
the grant ref is valid.

If gref->gref_id == -ENOSPC the test in __del_gref() would incorrectly
attempt to end foreign access (because grant_ref_t is unsigned).

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Reported-by: Dave Scott <dave.scott@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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