linux-kernel - [PATCH 1/2] spi: uniphier: fix timeout error

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Message-Id: <1561509708-4175-2-git-send-email-hayashibara.keiji@socionext.com>
Date:   Wed, 26 Jun 2019 09:41:47 +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 1/2] spi: uniphier: fix timeout error

Timeout error was silently ignored.
This commit adds timeout error handling and modifies return type of
wait_for_completion_timeout().

Signed-off-by: Keiji Hayashibara <hayashibara.keiji@...ionext.com>
---
 drivers/spi/spi-uniphier.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-uniphier.c b/drivers/spi/spi-uniphier.c
index 5a6137f..c3c35c0 100644
--- a/drivers/spi/spi-uniphier.c
+++ b/drivers/spi/spi-uniphier.c
@@ -328,7 +328,8 @@ static int uniphier_spi_transfer_one(struct spi_master *master,
 				     struct spi_transfer *t)
 {
 	struct uniphier_spi_priv *priv = spi_master_get_devdata(master);
-	int status;
+	struct device *dev = master->dev.parent;
+	unsigned long time_left;
 
 	uniphier_spi_setup_transfer(spi, t);
 
@@ -338,13 +339,15 @@ static int uniphier_spi_transfer_one(struct spi_master *master,
 
 	uniphier_spi_irq_enable(spi, SSI_IE_RCIE | SSI_IE_RORIE);
 
-	status = wait_for_completion_timeout(&priv->xfer_done,
-					     msecs_to_jiffies(SSI_TIMEOUT_MS));
+	time_left = wait_for_completion_timeout(&priv->xfer_done,
+					msecs_to_jiffies(SSI_TIMEOUT_MS));
 
 	uniphier_spi_irq_disable(spi, SSI_IE_RCIE | SSI_IE_RORIE);
 
-	if (status < 0)
-		return status;
+	if (!time_left) {
+		dev_err(dev, "transfer timeout.\n");
+		return -ETIMEDOUT;
+	}
 
 	return priv->error;
 }
-- 
2.7.4