linux-kernel - [PATCH v2] media: st_rc: Handle errors of clk_prepare

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Date:   Tue,  1 Jun 2021 15:56:43 +0300
From:   Evgeny Novikov <novikov@...ras.ru>
To:     Patrice Chotard <patrice.chotard@...s.st.com>
Cc:     Evgeny Novikov <novikov@...ras.ru>, Sean Young <sean@...s.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH v2] media: st_rc: Handle errors of clk_prepare_enable()

Hadle errors of clk_prepare_enable() in st_rc_hardware_init() and its
callers.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Evgeny Novikov <novikov@...ras.ru>
---
v2: Add error loging (Sean Young)
---
 drivers/media/rc/st_rc.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/media/rc/st_rc.c b/drivers/media/rc/st_rc.c
index 3237fef5d502..d79d1e3996b2 100644
--- a/drivers/media/rc/st_rc.c
+++ b/drivers/media/rc/st_rc.c
@@ -157,8 +157,9 @@ static irqreturn_t st_rc_rx_interrupt(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static void st_rc_hardware_init(struct st_rc_device *dev)
+static int st_rc_hardware_init(struct st_rc_device *dev)
 {
+	int ret;
 	int baseclock, freqdiff;
 	unsigned int rx_max_symbol_per = MAX_SYMB_TIME;
 	unsigned int rx_sampling_freq_div;
@@ -166,7 +167,12 @@ static void st_rc_hardware_init(struct st_rc_device *dev)
 	/* Enable the IP */
 	reset_control_deassert(dev->rstc);
 
-	clk_prepare_enable(dev->sys_clock);
+	ret = clk_prepare_enable(dev->sys_clock);
+	if (ret) {
+		dev_err(dev->dev, "Failed to prepare/enable system clock\n");
+		return ret;
+	}
+
 	baseclock = clk_get_rate(dev->sys_clock);
 
 	/* IRB input pins are inverted internally from high to low. */
@@ -184,6 +190,8 @@ static void st_rc_hardware_init(struct st_rc_device *dev)
 	}
 
 	writel(rx_max_symbol_per, dev->rx_base + IRB_MAX_SYM_PERIOD);
+
+	return 0;
 }
 
 static int st_rc_remove(struct platform_device *pdev)
@@ -287,7 +295,9 @@ static int st_rc_probe(struct platform_device *pdev)
 
 	rc_dev->dev = dev;
 	platform_set_drvdata(pdev, rc_dev);
-	st_rc_hardware_init(rc_dev);
+	ret = st_rc_hardware_init(rc_dev);
+	if (ret)
+		goto err;
 
 	rdev->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 	/* rx sampling rate is 10Mhz */
@@ -359,6 +369,7 @@ static int st_rc_suspend(struct device *dev)
 
 static int st_rc_resume(struct device *dev)
 {
+	int ret;
 	struct st_rc_device *rc_dev = dev_get_drvdata(dev);
 	struct rc_dev	*rdev = rc_dev->rdev;
 
@@ -367,7 +378,10 @@ static int st_rc_resume(struct device *dev)
 		rc_dev->irq_wake = 0;
 	} else {
 		pinctrl_pm_select_default_state(dev);
-		st_rc_hardware_init(rc_dev);
+		ret = st_rc_hardware_init(rc_dev);
+		if (ret)
+			return ret;
+
 		if (rdev->users) {
 			writel(IRB_RX_INTS, rc_dev->rx_base + IRB_RX_INT_EN);
 			writel(0x01, rc_dev->rx_base + IRB_RX_EN);
-- 
2.26.2