linux-kernel - [PATCH] rapidio/tsi721: use tasklet_kill in device remove/release process

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Message-Id: <1351680769-27306-1-git-send-email-xtfeng@gmail.com>
Date:	Wed, 31 Oct 2012 18:52:49 +0800
From:	Xiaotian Feng <xtfeng@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Xiaotian Feng <xtfeng@...il.com>,
	Xiaotian Feng <dannyfeng@...cent.com>,
	Matt Porter <mporter@...nel.crashing.org>,
	Alexandre Bounine <alexandre.bounine@....com>
Subject: [PATCH] rapidio/tsi721: use tasklet_kill in device remove/release process

Some driver uses tasklet_disable in device remove/release process,
tasklet_disable will inc tasklet->count and return. If the tasklet
is not handled yet under some softirq pressure, the tasklet will be
placed on the tasklet_vec, never have a chance to be excuted. This might
lead to a heavy loaded ksoftirqd, wakeup with pending_softirq, but
tasklet is disabled. tasklet_kill should be used in this case.

Signed-off-by: Xiaotian Feng <dannyfeng@...cent.com>
Cc: Matt Porter <mporter@...nel.crashing.org>
Cc: Alexandre Bounine <alexandre.bounine@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org> 
---
 drivers/rapidio/devices/tsi721_dma.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/rapidio/devices/tsi721_dma.c b/drivers/rapidio/devices/tsi721_dma.c
index 92e06a5..a098fbc 100644
--- a/drivers/rapidio/devices/tsi721_dma.c
+++ b/drivers/rapidio/devices/tsi721_dma.c
@@ -589,7 +589,7 @@ static void tsi721_free_chan_resources(struct dma_chan *dchan)
 	BUG_ON(!list_empty(&bdma_chan->active_list));
 	BUG_ON(!list_empty(&bdma_chan->queue));
 
-	tasklet_disable(&bdma_chan->tasklet);
+	tasklet_kill(&bdma_chan->tasklet);
 
 	spin_lock_bh(&bdma_chan->lock);
 	list_splice_init(&bdma_chan->free_list, &list);
-- 
1.7.9.5

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