linux-kernel - [PATCH -next] dmaengine: at_xdmac: Fix missing unlock in at_xdmac

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Date:   Fri, 7 Jan 2022 10:40:47 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <dmaengine@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     <ludovic.desroches@...rochip.com>, <tudor.ambarus@...rochip.com>,
        <vkoul@...nel.org>
Subject: [PATCH -next] dmaengine: at_xdmac: Fix missing unlock in at_xdmac_tasklet()

Add the missing unlock before return from at_xdmac_tasklet().

Fixes: e77e561925df ("dmaengine: at_xdmac: Fix race over irq_status")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/dma/at_xdmac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index a1da2b4b6d73..1476156af74b 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1681,8 +1681,10 @@ static void at_xdmac_tasklet(struct tasklet_struct *t)
 		__func__, atchan->irq_status);
 
 	if (!(atchan->irq_status & AT_XDMAC_CIS_LIS) &&
-	    !(atchan->irq_status & error_mask))
+	    !(atchan->irq_status & error_mask)) {
+		spin_unlock_irq(&atchan->lock);
 		return;
+	}
 
 	if (atchan->irq_status & error_mask)
 		at_xdmac_handle_error(atchan);
-- 
2.25.1