linux-kernel - [PATCH] dmaengine: xilinx: xdma: Fixes possible threading issue

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Message-Id: <20240527-xdma-fixes-v1-1-f31434b56842@bootlin.com>
Date: Mon, 27 May 2024 18:29:17 +0200
From: Louis Chauvet <louis.chauvet@...tlin.com>
To: Lizhi Hou <lizhi.hou@....com>, Brian Xu <brian.xu@....com>, 
 Raj Kumar Rampelli <raj.kumar.rampelli@....com>, 
 Vinod Koul <vkoul@...nel.org>, Michal Simek <michal.simek@....com>
Cc: dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Louis Chauvet <louis.chauvet@...tlin.com>
Subject: [PATCH] dmaengine: xilinx: xdma: Fixes possible threading issue

The current interrupt handler in xdma.c was using xdma->stop_request
before locking the vchan lock.

Fixes: 6a40fb824596 ("dmaengine: xilinx: xdma: Fix synchronization issue")
Signed-off-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/dma/xilinx/xdma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/xilinx/xdma.c b/drivers/dma/xilinx/xdma.c
index e143a7330816..718842fdaf98 100644
--- a/drivers/dma/xilinx/xdma.c
+++ b/drivers/dma/xilinx/xdma.c
@@ -885,11 +885,11 @@ static irqreturn_t xdma_channel_isr(int irq, void *dev_id)
 	u32 st;
 	bool repeat_tx;
 
+	spin_lock(&xchan->vchan.lock);
+
 	if (xchan->stop_requested)
 		complete(&xchan->last_interrupt);
 
-	spin_lock(&xchan->vchan.lock);
-
 	/* get submitted request */
 	vd = vchan_next_desc(&xchan->vchan);
 	if (!vd)

---
base-commit: 1613e604df0cd359cf2a7fbd9be7a0bcfacfabd0
change-id: 20240527-xdma-fixes-74bbe2dcbeb8

Best regards,
-- 
Louis Chauvet <louis.chauvet@...tlin.com>