linux-kernel - [PATCH v2 4/4] dmaengine: zynqmp_dma: Fix race condition in the probe

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Date:   Thu, 7 Dec 2017 10:54:28 +0530
From:   Kedareswara rao Appana <appana.durga.rao@...inx.com>
To:     <vinod.koul@...el.com>, <dan.j.williams@...el.com>,
        <michal.simek@...inx.com>, <appanad@...inx.com>, <sr@...x.de>,
        <dave.jiang@...el.com>, <kedare06@...il.com>
CC:     <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 4/4] dmaengine: zynqmp_dma: Fix race condition in the probe

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>
---
Changes for v2:
--> New patch.

 drivers/dma/xilinx/zynqmp_dma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
index a297a26..f146458 100644
--- a/drivers/dma/xilinx/zynqmp_dma.c
+++ b/drivers/dma/xilinx/zynqmp_dma.c
@@ -851,7 +851,8 @@ static void zynqmp_dma_chan_remove(struct zynqmp_dma_chan *chan)
 	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);
 }
-- 
2.7.4