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authorBoris Ostrovsky <boris.ostrovsky@oracle.com>2018-09-22 21:55:49 +0200
committerJens Axboe <axboe@kernel.dk>2018-09-27 16:26:38 +0200
commitf151ba989d149bbdfc90e5405724bbea094f9b17 (patch)
treee87c470b310a6b24303455712a5bf798282d6c13 /drivers/block/xen-blkfront.c
parentblock: fix deadline elevator drain for zoned block devices (diff)
downloadlinux-f151ba989d149bbdfc90e5405724bbea094f9b17.tar.xz
linux-f151ba989d149bbdfc90e5405724bbea094f9b17.zip
xen/blkfront: When purging persistent grants, keep them in the buffer
Commit a46b53672b2c ("xen/blkfront: cleanup stale persistent grants") added support for purging persistent grants when they are not in use. As part of the purge, the grants were removed from the grant buffer, This eventually causes the buffer to become empty, with BUG_ON triggered in get_free_grant(). This can be observed even on an idle system, within 20-30 minutes. We should keep the grants in the buffer when purging, and only free the grant ref. Fixes: a46b53672b2c ("xen/blkfront: cleanup stale persistent grants") Reviewed-by: Juergen Gross <jgross@suse.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to '')
-rw-r--r--drivers/block/xen-blkfront.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index a71d817e900d..3b441fe69c0d 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -2667,11 +2667,9 @@ static void purge_persistent_grants(struct blkfront_info *info)
gnttab_query_foreign_access(gnt_list_entry->gref))
continue;
- list_del(&gnt_list_entry->node);
gnttab_end_foreign_access(gnt_list_entry->gref, 0, 0UL);
+ gnt_list_entry->gref = GRANT_INVALID_REF;
rinfo->persistent_gnts_c--;
- __free_page(gnt_list_entry->page);
- kfree(gnt_list_entry);
}
spin_unlock_irqrestore(&rinfo->ring_lock, flags);