From: Jens Axboe <jaxboe@fusionio.com>
Date: Fri, 22 Oct 2010 08:58:33 +0000 (+0200)
Subject: xen-blkfront: disable barrier/flush write support
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=005a1d15f5a6b2bb4ada80349513effbf22b4588;p=openwrt%2Fstaging%2Fblogic.git

xen-blkfront: disable barrier/flush write support

The driver doesn't handle empty flushes. Disable barrier/flush
write support until this is fixed up.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
---

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index f2ffc46644df..739b4c1416ea 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1067,8 +1067,15 @@ static void blkfront_connect(struct blkfront_info *info)
 	 * If there are barriers, then we use flush.
 	 */
 	info->feature_flush = 0;
+
+	/*
+	 * The driver doesn't properly handled empty flushes, so
+	 * lets disable barrier support for now.
+	 */
+#if 0
 	if (!err && barrier)
 		info->feature_flush = REQ_FLUSH;
+#endif
 
 	err = xlvbd_alloc_gendisk(sectors, info, binfo, sector_size);
 	if (err) {