mmc: meson-mx-sdhc: Fix error check for dma_map_sg

dma_map_sg return 0 on error, also change the type for dma_len
from int to unsigned int.

Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Kevin Hilman <khilman@baylibre.com>
Cc: Jerome Brunet <jbrunet@baylibre.com>
Cc: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Link: https://lore.kernel.org/r/20220825074008.33349-2-jinpu.wang@ionos.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/meson-mx-sdhc-mmc.c b/drivers/mmc/host/meson-mx-sdhc-mmc.c
index e92e63cb5641cf30beb9d076d8cff3609373cd9f..da85c2f2acb83f3072091f416f0a8c2277ed0c92 100644 (file)
--- a/drivers/mmc/host/meson-mx-sdhc-mmc.c
+++ b/drivers/mmc/host/meson-mx-sdhc-mmc.c
@@ -381,14 +381,14 @@ static void meson_mx_sdhc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 static int meson_mx_sdhc_map_dma(struct mmc_host *mmc, struct mmc_request *mrq)
 {
        struct mmc_data *data = mrq->data;
-       int dma_len;
+       unsigned int dma_len;
 
        if (!data)
                return 0;
 
        dma_len = dma_map_sg(mmc_dev(mmc), data->sg, data->sg_len,
                             mmc_get_dma_dir(data));
-       if (dma_len <= 0) {
+       if (!dma_len) {
                dev_err(mmc_dev(mmc), "dma_map_sg failed\n");
                return -ENOMEM;
        }