[PATCH 2/2] mmc: jz4740_mmc: Fix error check for dma_map_sg

[Jack Wang]

dma_map_sg return 0 on error.

Cc: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
Cc: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Cc: linux-mips@xxxxxxxxxxxxxxx
Cc: linux-mmc@xxxxxxxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx

Signed-off-by: Jack Wang <jinpu.wang@xxxxxxxxx>
---
 drivers/mmc/host/jz4740_mmc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/jz4740_mmc.c b/drivers/mmc/host/jz4740_mmc.c
index b1d563b2ed1b..dc2db9c185ea 100644
--- a/drivers/mmc/host/jz4740_mmc.c
+++ b/drivers/mmc/host/jz4740_mmc.c
@@ -298,7 +298,7 @@ static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
 {
 	struct dma_chan *chan = jz4740_mmc_get_dma_chan(host, data);
 	enum dma_data_direction dir = mmc_get_dma_dir(data);
-	int sg_count;
+	unsigned int sg_count;
 
 	if (data->host_cookie == COOKIE_PREMAPPED)
 		return data->sg_count;
@@ -308,7 +308,7 @@ static int jz4740_mmc_prepare_dma_data(struct jz4740_mmc_host *host,
 			data->sg_len,
 			dir);
 
-	if (sg_count <= 0) {
+	if (!sg_count) {
 		dev_err(mmc_dev(host->mmc),
 			"Failed to map scatterlist for DMA operation\n");
 		return -EINVAL;
-- 
2.34.1