linux-kernel - [PATCH V2] misc: fastrpc: add checked value for dma_set

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Date:   Thu, 28 Mar 2019 03:47:37 -0400
From:   Bo YU <tsu.yubo@...il.com>
To:     arnd@...db.de, gregkh@...uxfoundation.org
Cc:     Bo YU <tsu.yubo@...il.com>, linux-kernel@...r.kernel.org,
        yuzibode@....com
Subject: [PATCH V2] misc: fastrpc: add checked value for dma_set_mask

There be should check return value from dma_set_mask to throw some info
if fail to set dma mask.

Detected by CoverityScan, CID# 1443983:  Error handling issues (CHECKED_RETURN)

Fixes:f6f9279f2bf0 (misc: fastrpc: Add Qualcomm fastrpc basic driver model)
Signed-off-by: Bo YU <tsu.yubo@...il.com>
---
V2: rebase misc tree
---
 drivers/misc/fastrpc.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 39f832d27288..36d0d5c9cfba 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -1184,6 +1184,7 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
 	struct fastrpc_session_ctx *sess;
 	struct device *dev = &pdev->dev;
 	int i, sessions = 0;
+	int rc;

 	cctx = dev_get_drvdata(dev->parent);
 	if (!cctx)
@@ -1213,7 +1214,11 @@ static int fastrpc_cb_probe(struct platform_device *pdev)
 	}
 	cctx->sesscount++;
 	spin_unlock(&cctx->lock);
-	dma_set_mask(dev, DMA_BIT_MASK(32));
+	rc = dma_set_mask(dev, DMA_BIT_MASK(32));
+	if (rc) {
+		dev_err(dev, "32-bit DMA enable failed\n");
+		return rc;
+	}

 	return 0;
 }
--
2.11.0