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Message-Id: <20211202091839.1489204-1-jiasheng@iscas.ac.cn>
Date: Thu, 2 Dec 2021 17:18:39 +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 RESEND] 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
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