linux-kernel - [PATCH v2] uio: uio_dmem_genirq: Catch the Exception

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Message-Id: <20211204000326.1592687-1-jiasheng@iscas.ac.cn>
Date:   Sat,  4 Dec 2021 08:03:26 +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 v2] 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>
---
Changelog

v1 -> v2

* Change 1. Print out the DMA error.
---
 drivers/uio/uio_dmem_genirq.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c
index 6b5cfa5b0673..1106f3376404 100644
--- a/drivers/uio/uio_dmem_genirq.c
+++ b/drivers/uio/uio_dmem_genirq.c
@@ -188,7 +188,11 @@ 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) {
+		dev_err(&pdev->dev, "DMA enable failed\n");
+		return ret;
+	}
 
 	priv->uioinfo = uioinfo;
 	spin_lock_init(&priv->lock);
-- 
2.25.1