linux-kernel - [PATCH 1/1]: Thaws refrigerated bdi flusher threads before invoking kthread

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Date:	Wed, 11 Nov 2009 14:00:16 +0530
From:	Romit Dasgupta <romit@...com>
To:	jens.axboe@...cle.com, rjw@...k.pl, pavel@....cz
Cc:	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	linux-pm@...ts.linux-foundation.org
Subject: [PATCH 1/1]: Thaws refrigerated bdi flusher threads before
 invoking kthread_stop on them

Kicks out frozen bdi flusher task out of the refrigerator when the flusher task
needs to exit.
Signed-off-by: Romit Dasgupta <romit@...com>
---
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 5a37e20..c757b05 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -606,8 +606,11 @@ static void bdi_wb_shutdown(struct backing_dev_info *bdi)
 	 * Finally, kill the kernel threads. We don't need to be RCU
 	 * safe anymore, since the bdi is gone from visibility.
 	 */
-	list_for_each_entry(wb, &bdi->wb_list, list)
+	list_for_each_entry(wb, &bdi->wb_list, list) {
+		if (unlikely(frozen(wb->task)))
+			wb->task->flags &= ~PF_FROZEN;
 		kthread_stop(wb->task);
+	}
 }
 
 void bdi_unregister(struct backing_dev_info *bdi)


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