linux-kernel - [PATCH -v2 2/3] xen-blkback: repleace check kthread_should_stop() to remove_requested in xen_blkif

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Message-ID: <4E38E552.2030207@oracle.com>
Date:	Wed, 03 Aug 2011 14:06:10 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	Joe Jin <joe.jin@...cle.com>,
	Daniel Stodden <daniel.stodden@...rix.com>,
	Jens Axboe <jaxboe@...ionio.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Annie Li <annie.li@...cle.com>,
	Ian Campbell <Ian.Campbell@...citrix.com>,
	Kurt C Hackel <KURT.HACKEL@...cle.com>,
	Greg Marsden <greg.marsden@...cle.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH -v2 2/3] xen-blkback: repleace check kthread_should_stop()
 to remove_requested in xen_blkif_schedule() loop.

When backend state change to XenbusStateClosed, remove_requested will be set,
so repleace check kthread_should_stop() to remove_requested in 
xen_blkif_schedule() loop.

Signed-off-by: Joe Jin <joe.jin@...cle.com>
Cc: Daniel Stodden <daniel.stodden@...rix.com>
Cc: Jens Axboe <jaxboe@...ionio.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc: Annie Li <annie.li@...cle.com>
Cc: Ian Campbell <Ian.Campbell@...citrix.com>
--
 drivers/block/xen-blkback/blkback.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 2330a9a..3d64b52 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -274,7 +274,7 @@ int xen_blkif_schedule(void *arg)
 
 	xen_blkif_get(blkif);
 
-	while (!kthread_should_stop()) {
+	while (!blkif->remove_requested) {
 		if (try_to_freeze())
 			continue;
 		if (unlikely(vbd->size != vbd_sz(vbd)))
@@ -282,11 +282,11 @@ int xen_blkif_schedule(void *arg)
 
 		wait_event_interruptible(
 			blkif->wq,
-			blkif->waiting_reqs || kthread_should_stop());
+			blkif->waiting_reqs || blkif->remove_requested);
 		wait_event_interruptible(
 			blkbk->pending_free_wq,
 			!list_empty(&blkbk->pending_free) ||
-			kthread_should_stop());
+			blkif->remove_requested);
 
 		blkif->waiting_reqs = 0;
 		smp_mb(); /* clear flag *before* checking for work */
@@ -301,8 +301,8 @@ int xen_blkif_schedule(void *arg)
 	if (log_stats)
 		print_stats(blkif);
 
-	blkif->xenblkd = NULL;
 	xen_blkif_put(blkif);
+	xen_blkback_close(blkif);
 
 	return 0;
 }
@@ -476,7 +476,7 @@ __do_block_io_op(struct xen_blkif *blkif)
 		if (RING_REQUEST_CONS_OVERFLOW(&blk_rings->common, rc))
 			break;
 
-		if (kthread_should_stop()) {
+		if (blkif->remove_requested) {
 			more_to_do = 1;
 			break;
 		}

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