linux-kernel - [PATCH AUTOSEL 4.9 42/43] dmaengine: mv_xor

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Message-ID: <20180907003816.57852-42-alexander.levin@microsoft.com>
Date:   Fri, 7 Sep 2018 00:38:47 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Hanna Hawa <hannah@...vell.com>, Vinod Koul <vkoul@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 42/43] dmaengine: mv_xor_v2: kill the tasklets
 upon exit

From: Hanna Hawa <hannah@...vell.com>

[ Upstream commit 8bbafed8dd5cfa81071b50ead5cb60367fdef3a9 ]

The mv_xor_v2 driver uses a tasklet, initialized during the probe()
routine. However, it forgets to cleanup the tasklet using
tasklet_kill() function during the remove() routine, which this patch
fixes. This prevents the tasklet from potentially running after the
module has been removed.

Fixes: 19a340b1a820 ("dmaengine: mv_xor_v2: new driver")

Signed-off-by: Hanna Hawa <hannah@...vell.com>
Reviewed-by: Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/dma/mv_xor_v2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma/mv_xor_v2.c b/drivers/dma/mv_xor_v2.c
index 71866646ffef..be1f5c26fae8 100644
--- a/drivers/dma/mv_xor_v2.c
+++ b/drivers/dma/mv_xor_v2.c
@@ -844,6 +844,8 @@ static int mv_xor_v2_remove(struct platform_device *pdev)
 
 	platform_msi_domain_free_irqs(&pdev->dev);
 
+	tasklet_kill(&xor_dev->irq_tasklet);
+
 	clk_disable_unprepare(xor_dev->clk);
 
 	return 0;
-- 
2.17.1