linux-kernel - [PATCH] fix "prev->state: 2 != TASK_RUNNING??" problem on SD/MMC card removal

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Date:	Thu, 23 Nov 2006 18:42:17 +0300
From:	Vitaly Wool <vitalywool@...il.com>
To:	drzeus-mmc@...eus.cx
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] fix "prev->state: 2 != TASK_RUNNING??" problem on SD/MMC
 card removal

Hello Pierre,

currently on SD/MMC card removal the system exhibits the following message (the platform is ARM Versatile):

    prev->state: 2 != TASK_RUNNING??
    mmcqd/762[CPU#0]: BUG in __schedule at linux-2.6/kernel/sched.c:3826

The patch inlined below fixes this problem.

 drivers/mmc/mmc_queue.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

Signed-off-by: Vitaly Wool <vitalywool@...il.com>

Index: linux-2.6.18/drivers/mmc/mmc_queue.c
===================================================================
--- linux-2.6.18.orig/drivers/mmc/mmc_queue.c
+++ linux-2.6.18/drivers/mmc/mmc_queue.c
@@ -84,8 +84,10 @@ static int mmc_queue_thread(void *d)
 		spin_unlock_irq(q->queue_lock);
 
 		if (!req) {
-			if (mq->flags & MMC_QUEUE_EXIT)
+			if (mq->flags & MMC_QUEUE_EXIT) {
+				set_current_state(TASK_RUNNING);
 				break;
+			}
 			up(&mq->thread_sem);
 			schedule();
 			down(&mq->thread_sem);
-
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