[PATCH] mailbox: bcm-ferxrm-mailbox: Fix error check for dma_map_sg

[Jack Wang]

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

Cc: Jassi Brar <jassisinghbrar@xxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
---
 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