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Subject[PATCH 4/9] mtd-make mtdtrans thread suspend friendly
From
Date
>From 23892d5e002d63b7980742fa5445443547fcf8cf Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@gmail.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@gmail.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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