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From:   Dmitry Osipenko <digetx@gmail.com>
To:     Thierry Reding <thierry.reding@gmail.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Laxman Dewangan <ldewangan@nvidia.com>,
        Wolfram Sang <wsa@the-dreams.de>,
        =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= <mirq-linux@rere.qmqm.pl>,
        Andy Shevchenko <andy.shevchenko@gmail.com>
Cc:     linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [PATCH v9 26/32] i2c: tegra: Check errors for both positive and negative values
Date:   Wed, 30 Sep 2020 01:19:09 +0300
Message-Id: <20200929221915.10979-27-digetx@gmail.com>
In-Reply-To: <20200929221915.10979-1-digetx@gmail.com>
References: <20200929221915.10979-1-digetx@gmail.com>
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The driver's code is inconsistent in regards to the error values checking.
The correct way should be to check both positive and negative values.
This patch cleans up the error-checks in the code. Note that the
pm_runtime_get_sync() could return positive value on success, hence only
relevant parts of the code are changed by this patch.

Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/i2c/busses/i2c-tegra.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index d8fc5cdcc310..41b6341be7b5 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -982,7 +982,7 @@ static void tegra_i2c_config_fifo_trig(struct tegra_i2c_dev *i2c_dev,
 
 		slv_config.device_fc = true;
 		ret = dmaengine_slave_config(chan, &slv_config);
-		if (ret < 0) {
+		if (ret) {
 			dev_err(i2c_dev->dev, "DMA slave config failed: %d\n",
 				ret);
 			dev_err(i2c_dev->dev, "falling back to PIO\n");
@@ -1222,7 +1222,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 						   xfer_size,
 						   DMA_FROM_DEVICE);
 			err = tegra_i2c_dma_submit(i2c_dev, xfer_size);
-			if (err < 0) {
+			if (err) {
 				dev_err(i2c_dev->dev,
 					"starting RX DMA failed, err %d\n",
 					err);
@@ -1248,7 +1248,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 						   xfer_size,
 						   DMA_TO_DEVICE);
 			err = tegra_i2c_dma_submit(i2c_dev, xfer_size);
-			if (err < 0) {
+			if (err) {
 				dev_err(i2c_dev->dev,
 					"starting TX DMA failed, err %d\n",
 					err);
-- 
2.27.0