linux-kernel - [PATCH v9 03/32] i2c: tegra: Handle potential error of tegra_i2c_flush

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Message-Id: <20200929221915.10979-4-digetx@gmail.com>
Date:   Wed, 30 Sep 2020 01:18:46 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v9 03/32] i2c: tegra: Handle potential error of tegra_i2c_flush_fifos()

Technically the tegra_i2c_flush_fifos() may fail and transfer should be
aborted in this case, but this shouldn't ever happen in practice unless
there is a bug somewhere in the driver. Let's add the error check just
for completeness.

Reviewed-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Reviewed-by: Thierry Reding <treding@...dia.com>
Tested-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/i2c/busses/i2c-tegra.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 4e7d0eec0dd3..88d6e7bb14a2 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1177,7 +1177,9 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 	bool dma;
 	u16 xfer_time = 100;
 
-	tegra_i2c_flush_fifos(i2c_dev);
+	err = tegra_i2c_flush_fifos(i2c_dev);
+	if (err)
+		return err;
 
 	i2c_dev->msg_buf = msg->buf;
 	i2c_dev->msg_buf_remaining = msg->len;
-- 
2.27.0