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.

Fixes: dbc049eee730 ("mailbox: Add driver for Broadcom FlexRM ring manager")
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>

diff --git a/drivers/mailbox/bcm-flexrm-mailbox.c b/drivers/mailbox/bcm-flexrm-mailbox.c
index fda16f7..bf6e86b 100644 (file)
--- 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;