diff mbox series

[2/2] spi: uniphier: fix zero-length transfer

Message ID 1561509708-4175-3-git-send-email-hayashibara.keiji@socionext.com (mailing list archive)
State Accepted
Commit 2b947137f2b8f77474dfe77d68c52778bf6ae453
Headers show
Series spi: fix spi driver for UniPhier SoC | expand

Commit Message

Keiji Hayashibara June 26, 2019, 12:41 a.m. UTC 
The zero-length transfer results in timeout error because
the transfer doesn't start.
This commit modified to return success in this case.

Signed-off-by: Keiji Hayashibara <hayashibara.keiji@socionext.com>
---
 drivers/spi/spi-uniphier.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/spi/spi-uniphier.c b/drivers/spi/spi-uniphier.c
index c3c35c0..b32c77d 100644
--- a/drivers/spi/spi-uniphier.c
+++ b/drivers/spi/spi-uniphier.c
@@ -331,6 +331,10 @@  static int uniphier_spi_transfer_one(struct spi_master *master,
 	struct device *dev = master->dev.parent;
 	unsigned long time_left;
 
+	/* Terminate and return success for 0 byte length transfer */
+	if (!t->len)
+		return 0;
+
 	uniphier_spi_setup_transfer(spi, t);
 
 	reinit_completion(&priv->xfer_done);