linux-kernel - [PATCH] mmc: cb710: drop free_irq for devm_request

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Date:	Tue, 24 Sep 2013 10:40:57 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	mirq-linux@...e.qmqm.pl, gregkh@...uxfoundation.org
Cc:	yongjun_wei@...ndmicro.com.cn, linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: cb710: drop free_irq for devm_request_irq allocated irq

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

irq allocated with devm_request_irq should not be freed using
free_irq, because doing so causes a dangling pointer, and a
subsequent double free.

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/misc/cb710/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/cb710/core.c b/drivers/misc/cb710/core.c
index 2e50f81..fb397e7 100644
--- a/drivers/misc/cb710/core.c
+++ b/drivers/misc/cb710/core.c
@@ -176,7 +176,7 @@ static int cb710_suspend(struct pci_dev *pdev, pm_message_t state)
 {
 	struct cb710_chip *chip = pci_get_drvdata(pdev);
 
-	free_irq(pdev->irq, chip);
+	devm_free_irq(&pdev->dev, pdev->irq, chip);
 	pci_save_state(pdev);
 	pci_disable_device(pdev);
 	if (state.event & PM_EVENT_SLEEP)

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