linux-kernel - [PATCH 1/2] dmaengine: qcom_bam_dma: Clear IRQ only if its set

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Message-Id: <1458640151-15150-2-git-send-email-gpramod@codeaurora.org>
Date:	Tue, 22 Mar 2016 15:19:10 +0530
From:	Pramod Gurav <gpramod@...eaurora.org>
To:	andy.gross@...aro.org, linux-kernel@...r.kernel.org
Cc:	dmaengine@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, dan.j.williams@...el.com,
	vinod.koul@...el.com, okaya@...eaurora.org, architt@...eaurora.org,
	Pramod Gurav <gpramod@...eaurora.org>
Subject: [PATCH 1/2] dmaengine: qcom_bam_dma: Clear IRQ only if its set

Clear the BAM IRQ bit only if there is a BAM interrupt.

Signed-off-by: Pramod Gurav <gpramod@...eaurora.org>
---
 drivers/dma/qcom/bam_dma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index d5e0a9c..0880345 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -807,7 +807,8 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
 	/* don't allow reorder of the various accesses to the BAM registers */
 	mb();
 
-	writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
+	if (srcs & BAM_IRQ)
+		writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR));
 
 	return IRQ_HANDLED;
 }
-- 
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