linux-kernel - [PATCH 4/9] mtd-make mtdtrans thread suspend friendly

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Message-ID: <1262814485.14552.27.camel@maxim-laptop>
Date:	Wed, 06 Jan 2010 23:48:05 +0200
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	linux-mtd <linux-mtd@...ts.infradead.org>,
	Alex Dubov <oakad@...oo.com>, joern <joern@...fs.org>
Subject: [PATCH 4/9] mtd-make mtdtrans thread suspend friendly

>>From 23892d5e002d63b7980742fa5445443547fcf8cf Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@...il.com>
Date: Tue, 5 Jan 2010 23:25:19 +0200
Subject: [PATCH 4/9] mtd-make mtdtrans thread suspend friendly

Signed-of-by: Maxim Levitsky <maximlevitsky@...il.com>
---
 drivers/mtd/mtd_blkdevs.c |   15 +++++++--------
 1 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 6af4673..7070d35 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <linux/kthread.h>
+#include <linux/freezer.h>
 #include <asm/uaccess.h>
 
 #include "mtdcore.h"
@@ -79,37 +80,35 @@ static int mtd_blktrans_thread(void *arg)
 
 	/* we might get involved when memory gets low, so use PF_MEMALLOC */
 	current->flags |= PF_MEMALLOC;
-
-	spin_lock_irq(rq->queue_lock);
+	set_freezable();
 
 	while (!kthread_should_stop()) {
 		int res;
 
+		try_to_freeze();
+
+		spin_lock_irq(rq->queue_lock);
 		if (!req && !(req = blk_fetch_request(rq))) {
 			set_current_state(TASK_INTERRUPTIBLE);
 			spin_unlock_irq(rq->queue_lock);
 			schedule();
-			spin_lock_irq(rq->queue_lock);
 			continue;
 		}
-
 		spin_unlock_irq(rq->queue_lock);
 
+
 		mutex_lock(&dev->lock);
 		res = do_blktrans_request(dev->tr, dev, req);
 		mutex_unlock(&dev->lock);
 
 		spin_lock_irq(rq->queue_lock);
-
 		if (!__blk_end_request_cur(req, res))
 			req = NULL;
+		spin_unlock_irq(rq->queue_lock);
 	}
 
 	if (req)
 		__blk_end_request_all(req, -EIO);
-
-	spin_unlock_irq(rq->queue_lock);
-
 	return 0;
 }
 
-- 
1.6.3.3



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