[PATCH 5.19 491/717] mailbox: bcm-ferxrm-mailbox: Fix error check for dma_map_sg

Greg Kroah-Hartman
2022-10-22T08:21:51Z

From: Jack Wang <jinpu.wang@ionos.com>

[ Upstream commit 6b207ce8a96a71e966831e3a13c38143ba9a73c1 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 22acb51531cb..658e47b21933 100644
--- a/drivers/mailbox/bcm-flexrm-mailbox.c
+++ b/drivers/mailbox/bcm-flexrm-mailbox.c
@@ -632,15 +632,15 @@ 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;
--
2.35.1