From 504f34c9e45cf81731734ea1c80429a5116b23ca Mon Sep 17 00:00:00 2001 From: Daniel Lezcano Date: Mon, 6 Jun 2016 19:10:55 +0200 Subject: [PATCH] clocksource/drivers/atmel-pit: Convert init function to return error The init functions do not return any error. They behave as the following: - panic, thus leading to a kernel crash while another timer may work and make the system boot up correctly or - print an error and let the caller unaware if the state of the system Change that by converting the init functions to return an error conforming to the CLOCKSOURCE_OF_RET prototype. Proper error handling (rollback, errno value) will be changed later case by case, thus this change just return back an error or success in the init function. Signed-off-by: Daniel Lezcano --- drivers/clocksource/timer-atmel-pit.c | 43 ++++++++++++++++++--------- 1 file changed, 29 insertions(+), 14 deletions(-) diff --git a/drivers/clocksource/timer-atmel-pit.c b/drivers/clocksource/timer-atmel-pit.c index d911c5dca8f1..ffaca7c2c996 100644 --- a/drivers/clocksource/timer-atmel-pit.c +++ b/drivers/clocksource/timer-atmel-pit.c @@ -177,7 +177,7 @@ static irqreturn_t at91sam926x_pit_interrupt(int irq, void *dev_id) /* * Set up both clocksource and clockevent support. */ -static void __init at91sam926x_pit_common_init(struct pit_data *data) +static int __init at91sam926x_pit_common_init(struct pit_data *data) { unsigned long pit_rate; unsigned bits; @@ -204,14 +204,21 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data) data->clksrc.rating = 175; data->clksrc.read = read_pit_clk; data->clksrc.flags = CLOCK_SOURCE_IS_CONTINUOUS; - clocksource_register_hz(&data->clksrc, pit_rate); + + ret = clocksource_register_hz(&data->clksrc, pit_rate); + if (ret) { + pr_err("Failed to register clocksource"); + return ret; + } /* Set up irq handler */ ret = request_irq(data->irq, at91sam926x_pit_interrupt, IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL, "at91_tick", data); - if (ret) - panic(pr_fmt("Unable to setup IRQ\n")); + if (ret) { + pr_err("Unable to setup IRQ\n"); + return ret; + } /* Set up and register clockevents */ data->clkevt.name = "pit"; @@ -226,34 +233,42 @@ static void __init at91sam926x_pit_common_init(struct pit_data *data) data->clkevt.resume = at91sam926x_pit_resume; data->clkevt.suspend = at91sam926x_pit_suspend; clockevents_register_device(&data->clkevt); + + return 0; } -static void __init at91sam926x_pit_dt_init(struct device_node *node) +static int __init at91sam926x_pit_dt_init(struct device_node *node) { struct pit_data *data; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) - panic(pr_fmt("Unable to allocate memory\n")); + return -ENOMEM; data->base = of_iomap(node, 0); - if (!data->base) - panic(pr_fmt("Could not map PIT address\n")); + if (!data->base) { + pr_err("Could not map PIT address\n"); + return -ENXIO; + } data->mck = of_clk_get(node, 0); if (IS_ERR(data->mck)) /* Fallback on clkdev for !CCF-based boards */ data->mck = clk_get(NULL, "mck"); - if (IS_ERR(data->mck)) - panic(pr_fmt("Unable to get mck clk\n")); + if (IS_ERR(data->mck)) { + pr_err("Unable to get mck clk\n"); + return PTR_ERR(data->mck); + } /* Get the interrupts property */ data->irq = irq_of_parse_and_map(node, 0); - if (!data->irq) - panic(pr_fmt("Unable to get IRQ from DT\n")); + if (!data->irq) { + pr_err("Unable to get IRQ from DT\n"); + return -EINVAL; + } - at91sam926x_pit_common_init(data); + return at91sam926x_pit_common_init(data); } -CLOCKSOURCE_OF_DECLARE(at91sam926x_pit, "atmel,at91sam9260-pit", +CLOCKSOURCE_OF_DECLARE_RET(at91sam926x_pit, "atmel,at91sam9260-pit", at91sam926x_pit_dt_init);