linux-kernel - [PATCH] HSI: omap_ssi_port: Fix dma_map

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Message-Id: <20220826101227.78237-1-jinpu.wang@ionos.com>
Date:   Fri, 26 Aug 2022 12:12:27 +0200
From:   Jack Wang <jinpu.wang@...os.com>
To:     sre@...nel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] HSI: omap_ssi_port: Fix dma_map_sg error check

dma_map_sg return 0 on error, in case of error return -EIO
to caller.

Cc: Sebastian Reichel <sre@...nel.org>
Cc: linux-kernel@...r.kernel.org (open list)
Fixes: b209e047bc74 ("HSI: Introduce OMAP SSI driver")
Signed-off-by: Jack Wang <jinpu.wang@...os.com>
---
 drivers/hsi/controllers/omap_ssi_port.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/hsi/controllers/omap_ssi_port.c b/drivers/hsi/controllers/omap_ssi_port.c
index a0cb5be246e1..b9495b720f1b 100644
--- a/drivers/hsi/controllers/omap_ssi_port.c
+++ b/drivers/hsi/controllers/omap_ssi_port.c
@@ -230,10 +230,10 @@ static int ssi_start_dma(struct hsi_msg *msg, int lch)
 	if (msg->ttype == HSI_MSG_READ) {
 		err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
 							DMA_FROM_DEVICE);
-		if (err < 0) {
+		if (!err) {
 			dev_dbg(&ssi->device, "DMA map SG failed !\n");
 			pm_runtime_put_autosuspend(omap_port->pdev);
-			return err;
+			return -EIO;
 		}
 		csdp = SSI_DST_BURST_4x32_BIT | SSI_DST_MEMORY_PORT |
 			SSI_SRC_SINGLE_ACCESS0 | SSI_SRC_PERIPHERAL_PORT |
@@ -247,10 +247,10 @@ static int ssi_start_dma(struct hsi_msg *msg, int lch)
 	} else {
 		err = dma_map_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents,
 							DMA_TO_DEVICE);
-		if (err < 0) {
+		if (!err) {
 			dev_dbg(&ssi->device, "DMA map SG failed !\n");
 			pm_runtime_put_autosuspend(omap_port->pdev);
-			return err;
+			return -EIO;
 		}
 		csdp = SSI_SRC_BURST_4x32_BIT | SSI_SRC_MEMORY_PORT |
 			SSI_DST_SINGLE_ACCESS0 | SSI_DST_PERIPHERAL_PORT |
-- 
2.34.1