linux-kernel - [PATCH] staging: ozwpan: use tasklet_kill in device remove/release process

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Message-Id: <1351681008-27356-1-git-send-email-xtfeng@gmail.com>
Date:	Wed, 31 Oct 2012 18:56:48 +0800
From:	Xiaotian Feng <xtfeng@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Xiaotian Feng <xtfeng@...il.com>,
	Xiaotian Feng <dannyfeng@...cent.com>,
	Rupesh Gujare <rgujare@...odevices.com>,
	Chris Kelly <ckelly@...odevices.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org
Subject: [PATCH] staging: ozwpan: 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: Rupesh Gujare <rgujare@...odevices.com>
Cc: Chris Kelly <ckelly@...odevices.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: devel@...verdev.osuosl.org
---
 drivers/staging/ozwpan/ozhcd.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/ozwpan/ozhcd.c b/drivers/staging/ozwpan/ozhcd.c
index 2e087ac..33c0009 100644
--- a/drivers/staging/ozwpan/ozhcd.c
+++ b/drivers/staging/ozwpan/ozhcd.c
@@ -2304,8 +2304,8 @@ error:
  */
 void oz_hcd_term(void)
 {
-	tasklet_disable(&g_urb_process_tasklet);
-	tasklet_disable(&g_urb_cancel_tasklet);
+	tasklet_kill(&g_urb_process_tasklet);
+	tasklet_kill(&g_urb_cancel_tasklet);
 	platform_device_unregister(g_plat_dev);
 	platform_driver_unregister(&g_oz_plat_drv);
 	oz_trace("Pending urbs:%d\n", atomic_read(&g_pending_urbs));
-- 
1.7.9.5

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