From 04297b00dfb45277b8b661d48a7a5e29876fc6ae Mon Sep 17 00:00:00 2001 From: Evgeny Novikov Date: Tue, 1 Jun 2021 14:56:43 +0200 Subject: [PATCH] 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 Signed-off-by: Sean Young Signed-off-by: Mauro Carvalho Chehab --- 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 3237fef..d79d1e3 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); -- 2.7.4