linux-kernel - [PATCH] mailbox: bcm-ferxrm-mailbox: Fix error check for dma_map

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Message-Id: <20220826101335.78779-1-jinpu.wang@ionos.com>
Date:   Fri, 26 Aug 2022 12:13:35 +0200
From:   Jack Wang <jinpu.wang@...os.com>
To:     jassisinghbrar@...il.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] mailbox: bcm-ferxrm-mailbox: Fix error check for dma_map_sg

dma_map_sg return 0 on error, fix the error check, and return -EIO
to caller.

Cc: Jassi Brar <jassisinghbrar@...il.com>
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Jack Wang <jinpu.wang@...os.com>
---
 drivers/mailbox/bcm-flexrm-mailbox.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
index fda16f76401e..bf6e86b0ed09 100644
--- a/drivers/mailbox/bcm-flexrm-mailbox.c
+++ b/drivers/mailbox/bcm-flexrm-mailbox.c
@@ -622,15 +622,15 @@ static int flexrm_spu_dma_map(struct device *dev, struct brcm_message *msg)
 
 	rc = dma_map_sg(dev, msg->spu.src, sg_nents(msg->spu.src),
 			DMA_TO_DEVICE);
-	if (rc < 0)
-		return rc;
+	if (!rc)
+		return -EIO;
 
 	rc = dma_map_sg(dev, msg->spu.dst, sg_nents(msg->spu.dst),
 			DMA_FROM_DEVICE);
-	if (rc < 0) {
+	if (!rc) {
 		dma_unmap_sg(dev, msg->spu.src, sg_nents(msg->spu.src),
 			     DMA_TO_DEVICE);
-		return rc;
+		return -EIO;
 	}
 
 	return 0;
-- 
2.34.1