[PATCH] mmc_spi: add a status check for spi_sync_locked

[Kangjie Lu]

In case spi_sync_locked fails, the fix reports the error and
returns the error code upstream.

Signed-off-by: Kangjie Lu <kjlu@xxxxxxx>
---
 drivers/mmc/host/mmc_spi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 1b1498805972..32fea585262b 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -819,6 +819,10 @@ mmc_spi_readblock(struct mmc_spi_host *host, struct spi_transfer *t,
 	}
 
 	status = spi_sync_locked(spi, &host->m);
+	if (status < 0) {
+		dev_dbg(&spi->dev, "read error %02x (%d)\n", status, status);
+		return status;
+	}
 
 	if (host->dma_dev) {
 		dma_sync_single_for_cpu(host->dma_dev,
-- 
2.17.1