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media: st_rc: Handle errors of clk_prepare_enable()

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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@ispras.ru>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Evgeny Novikov 2021-06-01 14:56:43 +02:00 committed by Mauro Carvalho Chehab
parent da9a805b12
commit 04297b00df
1 changed files with 18 additions and 4 deletions
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22
drivers/media/rc/st_rc.c
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@ -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);