linux-kernel - [PATCH] spi: synquacer: Fix timeout handling in synquacer_spi_transfer

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Message-Id: <c2040bf3cfa201fd8890cfab14fa5a701ffeca14.1676466072.git.christophe.jaillet@wanadoo.fr>
Date:   Wed, 15 Feb 2023 14:01:28 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Masahisa Kojima <masahisa.kojima@...aro.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-spi@...r.kernel.org
Subject: [PATCH] spi: synquacer: Fix timeout handling in synquacer_spi_transfer_one()

wait_for_completion_timeout() never returns a <0 value. It returns either
on timeout or a positive value (at least 1, or number of jiffies left
till timeout)

So, fix the error handling path and return -ETIMEDOUT should a timeout
occur.

Fixes: b0823ee35cf9 ("spi: Add spi driver for Socionext SynQuacer platform")
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only.
---
 drivers/spi/spi-synquacer.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-synquacer.c b/drivers/spi/spi-synquacer.c
index 47cbe73137c2..dc188f9202c9 100644
--- a/drivers/spi/spi-synquacer.c
+++ b/drivers/spi/spi-synquacer.c
@@ -472,10 +472,9 @@ static int synquacer_spi_transfer_one(struct spi_master *master,
 		read_fifo(sspi);
 	}
 
-	if (status < 0) {
-		dev_err(sspi->dev, "failed to transfer. status: 0x%x\n",
-			status);
-		return status;
+	if (status == 0) {
+		dev_err(sspi->dev, "failed to transfer. Timeout.\n");
+		return -ETIMEDOUT;
 	}
 
 	return 0;
-- 
2.34.1