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[v2,1/8] spi: spi-s3c64xx: Do not ignore timeout errors in polling I/O mode

Message ID 20180417142954.5507-1-s.nawrocki@samsung.com (mailing list archive)
State Not Applicable
Headers show

Commit Message

Sylwester Nawrocki/Kernel \(PLT\) /SRPOL/Staff Engineer/Samsung Electronics April 17, 2018, 2:29 p.m. UTC 
Currently timeout errors in polling I/O mode transfer are silently ignored.
Fix it by returning an error when we time out waiting on the RX FIFO level
to reach the transfer length.

Reviewed-by: Andi Shyti <andi@etezian.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
---
 drivers/spi/spi-s3c64xx.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index baa3a9fa2638..9a990bc3138a 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -505,6 +505,8 @@  static int wait_for_pio(struct s3c64xx_spi_driver_data *sdd,
 		status = readl(regs + S3C64XX_SPI_STATUS);
 	} while (RX_FIFO_LVL(status, sdd) < xfer->len && --val);
 
+	if (!val)
+		return -EIO;
 
 	/* If it was only Tx */
 	if (!xfer->rx_buf) {