From 2b947137f2b8f77474dfe77d68c52778bf6ae453 Mon Sep 17 00:00:00 2001 From: Keiji Hayashibara Date: Wed, 26 Jun 2019 09:41:48 +0900 Subject: spi: uniphier: fix zero-length transfer 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 Signed-off-by: Mark Brown --- drivers/spi/spi-uniphier.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/spi/spi-uniphier.c b/drivers/spi/spi-uniphier.c index c3c35c041ef1..b32c77df5d49 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); -- cgit v1.2.3