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Subject[PATCH 6/8] blktrans: flush all requests before we remove the device
From
Date
>From 6d5a70a18bea40bfc354e73d7fde5042465fc534 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <maximlevitsky@gmail.com>
Date: Sat, 23 Jan 2010 02:09:11 +0200
Subject: [PATCH 6/8] blktrans: flush all requests before we remove the device

Flush all requests, so we can be sure we don't deadlock the system later
when we remove the disk queue.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
---
drivers/mtd/mtd_blkdevs.c | 14 +++++++++++++-
1 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index f165115..33bdef1 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -115,7 +115,13 @@ static int mtd_blktrans_thread(void *arg)
static void mtd_blktrans_request(struct request_queue *rq)
{
struct mtd_blktrans_dev *dev = rq->queuedata;
- wake_up_process(dev->thread);
+ struct request *req = NULL;
+
+ if (dev->deleted)
+ while ((req = blk_fetch_request(rq)) != NULL)
+ __blk_end_request_all(req, -ENODEV);
+ else
+ wake_up_process(dev->thread);
}


@@ -359,6 +365,8 @@ error1:

int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
{
+ unsigned long flags;
+
if (mutex_trylock(&mtd_table_mutex)) {
mutex_unlock(&mtd_table_mutex);
BUG();
@@ -369,7 +377,11 @@ int del_mtd_blktrans_dev(struct mtd_blktrans_dev *old)
/* stop new requests to arrive */
del_gendisk(old->disk);

+ /* flush current requests */
+ spin_lock_irqsave(&old->queue_lock, flags);
old->deleted = 1;
+ blk_start_queue(old->rq);
+ spin_unlock_irqrestore(&old->queue_lock, flags);

/* Stop the thread */
kthread_stop(old->thread);
--
1.6.3.3




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