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

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Date:   Wed, 26 Jun 2019 09:41:48 +0900
From:   Keiji Hayashibara <hayashibara.keiji@...ionext.com>
To:     broonie@...nel.org, yamada.masahiro@...ionext.com,
        linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     masami.hiramatsu@...aro.org, jaswinder.singh@...aro.org,
        linux-kernel@...r.kernel.org, hayashibara.keiji@...ionext.com
Subject: [PATCH 2/2] 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 <hayashibara.keiji@...ionext.com>
---
 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 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);
-- 
2.7.4