linux-kernel - [PATCH 4.18 092/235] dmaengine: mv_xor

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Date:   Mon, 24 Sep 2018 13:51:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hanna Hawa <hannah@...vell.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Vinod Koul <vkoul@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.18 092/235] dmaengine: mv_xor_v2: kill the tasklets upon exit

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dma/mv_xor_v2.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/dma/mv_xor_v2.c
+++ b/drivers/dma/mv_xor_v2.c
@@ -899,6 +899,8 @@ static int mv_xor_v2_remove(struct platf
 
 	platform_msi_domain_free_irqs(&pdev->dev);
 
+	tasklet_kill(&xor_dev->irq_tasklet);
+
 	clk_disable_unprepare(xor_dev->clk);
 
 	return 0;