linux-kernel - [PATCH 4.9 148/177] dmaengine: zynqmp_dma: Fix race condition in the probe

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Message-Id: <20180323094211.727028927@linuxfoundation.org>
Date:   Fri, 23 Mar 2018 10:54:36 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Kedareswara rao Appana <appanad@...inx.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 148/177] dmaengine: zynqmp_dma: Fix race condition in the probe

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

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

From: Kedareswara rao Appana <appana.durga.rao@...inx.com>


[ Upstream commit 5ba080aada5e739165e0f38d5cc3b04c82b323c8 ]

Incase of interrupt property is not present,
Driver is trying to free an invalid irq,
This patch fixes it by adding a check before freeing the irq.

Signed-off-by: Kedareswara rao Appana <appanad@...inx.com>
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/dma/xilinx/zynqmp_dma.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/dma/xilinx/zynqmp_dma.c
+++ b/drivers/dma/xilinx/zynqmp_dma.c
@@ -933,7 +933,8 @@ static void zynqmp_dma_chan_remove(struc
 	if (!chan)
 		return;
 
-	devm_free_irq(chan->zdev->dev, chan->irq, chan);
+	if (chan->irq)
+		devm_free_irq(chan->zdev->dev, chan->irq, chan);
 	tasklet_kill(&chan->tasklet);
 	list_del(&chan->common.device_node);
 	clk_disable_unprepare(chan->clk_apb);