From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
To: gregkh@linuxfoundation.org
Cc: linux-kernel@vger.kernel.org, Jiasheng Jiang <jiasheng@iscas.ac.cn>
Subject: [PATCH v2] uio: uio_dmem_genirq: Catch the Exception
Date: Sat, 4 Dec 2021 08:03:26 +0800 [thread overview]
Message-ID: <20211204000326.1592687-1-jiasheng@iscas.ac.cn> (raw)
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@iscas.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
reply other threads:[~2021-12-04 0:03 UTC|newest]
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