linux-kernel - [PATCH v7 26/34] i2c: tegra: Factor out hardware initialization into separate function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200908224006.25636-27-digetx@gmail.com>
Date:   Wed,  9 Sep 2020 01:39:58 +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 v7 26/34] i2c: tegra: Factor out hardware initialization into separate function

Factor out hardware initialization into a separate function from the probe
function. The only place where runtime PM needs to be resumed during probe
is the place of hardware initialization, hence it makes sense to factor
out it in order to have a bit cleaner error handling in tegra_i2c_probe().

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/i2c/busses/i2c-tegra.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index e071de9ce106..2f39366b6d55 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -1661,9 +1661,23 @@ static void tegra_i2c_release_clocks(struct tegra_i2c_dev *i2c_dev)
 	clk_bulk_unprepare(i2c_dev->nclocks, i2c_dev->clocks);
 }
 
+static int tegra_i2c_init_hardware(struct tegra_i2c_dev *i2c_dev)
+{
+	int ret;
+
+	ret = pm_runtime_get_sync(i2c_dev->dev);
+	if (ret < 0)
+		dev_err(i2c_dev->dev, "runtime resume failed: %d\n", ret);
+	else
+		ret = tegra_i2c_init(i2c_dev);
+
+	pm_runtime_put(i2c_dev->dev);
+
+	return ret;
+}
+
 static int tegra_i2c_probe(struct platform_device *pdev)
 {
-	struct device *dev = &pdev->dev;
 	struct tegra_i2c_dev *i2c_dev;
 	struct resource *res;
 	int ret;
@@ -1729,15 +1743,10 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 	if (!i2c_dev->is_vi)
 		pm_runtime_irq_safe(&pdev->dev);
 	pm_runtime_enable(&pdev->dev);
-	ret = pm_runtime_get_sync(i2c_dev->dev);
-	if (ret < 0) {
-		dev_err(dev, "runtime resume failed\n");
-		goto put_rpm;
-	}
 
-	ret = tegra_i2c_init(i2c_dev);
+	ret = tegra_i2c_init_hardware(i2c_dev);
 	if (ret)
-		goto put_rpm;
+		goto release_rpm;
 
 	i2c_set_adapdata(&i2c_dev->adapter, i2c_dev);
 	i2c_dev->adapter.dev.of_node = pdev->dev.of_node;
@@ -1758,14 +1767,11 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 
 	ret = i2c_add_numbered_adapter(&i2c_dev->adapter);
 	if (ret)
-		goto put_rpm;
-
-	pm_runtime_put(&pdev->dev);
+		goto release_rpm;
 
 	return 0;
 
-put_rpm:
-	pm_runtime_put_sync(&pdev->dev);
+release_rpm:
 	pm_runtime_disable(&pdev->dev);
 
 	tegra_i2c_release_dma(i2c_dev);
-- 
2.27.0