| Message ID | 20210515123909.5638-1-novikov@ispras.ru (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media: st_rc: Handle errors of clk_prepare_enable() | expand |
Hi Avgeny On 5/15/21 2:39 PM, Evgeny Novikov wrote: > 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> > --- > drivers/media/rc/st_rc.c | 20 ++++++++++++++++---- > 1 file changed, 16 insertions(+), 4 deletions(-) > > diff --git a/drivers/media/rc/st_rc.c b/drivers/media/rc/st_rc.c > index 3237fef5d502..f524fcf55acf 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 +167,10 @@ 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) > + return ret; > + > baseclock = clk_get_rate(dev->sys_clock); > > /* IRB input pins are inverted internally from high to low. */ > @@ -184,6 +188,8 @@ 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 +293,9 @@ 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 +367,7 @@ 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 +376,10 @@ 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); > Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com> Thanks Patrice
On Sat, May 15, 2021 at 03:39:09PM +0300, Evgeny Novikov wrote: > 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> > --- > drivers/media/rc/st_rc.c | 20 ++++++++++++++++---- > 1 file changed, 16 insertions(+), 4 deletions(-) > > diff --git a/drivers/media/rc/st_rc.c b/drivers/media/rc/st_rc.c > index 3237fef5d502..f524fcf55acf 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 +167,10 @@ 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) > + return ret; Now if probe or resume fails because of clk_prepare_enable() failing, no error is logged. Please add a dev_err(). Thanks Sean > + > baseclock = clk_get_rate(dev->sys_clock); > > /* IRB input pins are inverted internally from high to low. */ > @@ -184,6 +188,8 @@ 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 +293,9 @@ 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 +367,7 @@ 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 +376,10 @@ 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
diff --git a/drivers/media/rc/st_rc.c b/drivers/media/rc/st_rc.c index 3237fef5d502..f524fcf55acf 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 +167,10 @@ 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) + return ret; + baseclock = clk_get_rate(dev->sys_clock); /* IRB input pins are inverted internally from high to low. */ @@ -184,6 +188,8 @@ 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 +293,9 @@ 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 +367,7 @@ 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 +376,10 @@ 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);
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> --- drivers/media/rc/st_rc.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-)