linux-kernel - [PATCH] uio: uio_dmem_genirq: Catch the Exception The return value of dma_set_coherent_mask() is not always 0. To catch the exception in case that dma is not support the mask.

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Message-Id: <20211202091630.1489107-1-jiasheng@iscas.ac.cn>
Date:   Thu,  2 Dec 2021 17:16:30 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] uio: uio_dmem_genirq: Catch the Exception The return value of dma_set_coherent_mask() is not always 0. To catch the exception in case that dma is not support the mask.

Fixes: 0a0c3b5a24bd ("Add new uio device for dynamic memory allocation")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 drivers/uio/uio_dmem_genirq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c
index 6b5cfa5b0673..570f5be64b46 100644
--- a/drivers/uio/uio_dmem_genirq.c
+++ b/drivers/uio/uio_dmem_genirq.c
@@ -188,7 +188,9 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}

-	dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+	ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;

 	priv->uioinfo = uioinfo;
 	spin_lock_init(&priv->lock);
-- 
2.25.1