From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755376AbcFPV33 (ORCPT ); Thu, 16 Jun 2016 17:29:29 -0400 Received: from mail-wm0-f49.google.com ([74.125.82.49]:35356 "EHLO mail-wm0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933241AbcFPV3L (ORCPT ); Thu, 16 Jun 2016 17:29:11 -0400 From: Daniel Lezcano To: daniel.lezcano@linaro.org, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, Linus Walleij , linux-arm-kernel@lists.infradead.org (moderated list:ARM/U300 MACHINE...) Subject: [PATCH V2 50/63] clocksource/drivers/timer-u300: Convert init function to return error Date: Thu, 16 Jun 2016 23:27:09 +0200 Message-Id: <1466112442-31105-51-git-send-email-daniel.lezcano@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1466112442-31105-1-git-send-email-daniel.lezcano@linaro.org> References: <1466112442-31105-1-git-send-email-daniel.lezcano@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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-u300.c | 38 +++++++++++++++++++++++++++----------- 1 file changed, 27 insertions(+), 11 deletions(-) diff --git a/drivers/clocksource/timer-u300.c b/drivers/clocksource/timer-u300.c index 1744b24..a6a0dec 100644 --- a/drivers/clocksource/timer-u300.c +++ b/drivers/clocksource/timer-u300.c @@ -359,27 +359,37 @@ static struct delay_timer u300_delay_timer; /* * This sets up the system timers, clock source and clock event. */ -static void __init u300_timer_init_of(struct device_node *np) +static int __init u300_timer_init_of(struct device_node *np) { unsigned int irq; struct clk *clk; unsigned long rate; + int ret; u300_timer_base = of_iomap(np, 0); - if (!u300_timer_base) - panic("could not ioremap system timer\n"); + if (!u300_timer_base) { + pr_err("could not ioremap system timer\n"); + return -ENXIO; + } /* Get the IRQ for the GP1 timer */ irq = irq_of_parse_and_map(np, 2); - if (!irq) - panic("no IRQ for system timer\n"); + if (!irq) { + pr_err("no IRQ for system timer\n"); + return -EINVAL; + } pr_info("U300 GP1 timer @ base: %p, IRQ: %u\n", u300_timer_base, irq); /* Clock the interrupt controller */ clk = of_clk_get(np, 0); - BUG_ON(IS_ERR(clk)); - clk_prepare_enable(clk); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + rate = clk_get_rate(clk); u300_clockevent_data.ticks_per_jiffy = DIV_ROUND_CLOSEST(rate, HZ); @@ -410,7 +420,9 @@ static void __init u300_timer_init_of(struct device_node *np) u300_timer_base + U300_TIMER_APP_RGPT1); /* Set up the IRQ handler */ - setup_irq(irq, &u300_timer_irq); + ret = setup_irq(irq, &u300_timer_irq); + if (ret) + return ret; /* Reset the General Purpose timer 2 */ writel(U300_TIMER_APP_RGPT2_TIMER_RESET, @@ -428,9 +440,12 @@ static void __init u300_timer_init_of(struct device_node *np) u300_timer_base + U300_TIMER_APP_EGPT2); /* Use general purpose timer 2 as clock source */ - if (clocksource_mmio_init(u300_timer_base + U300_TIMER_APP_GPT2CC, - "GPT2", rate, 300, 32, clocksource_mmio_readl_up)) + ret = clocksource_mmio_init(u300_timer_base + U300_TIMER_APP_GPT2CC, + "GPT2", rate, 300, 32, clocksource_mmio_readl_up); + if (ret) { pr_err("timer: failed to initialize U300 clock source\n"); + return ret; + } /* Configure and register the clockevent */ clockevents_config_and_register(&u300_clockevent_data.cevd, rate, @@ -440,7 +455,8 @@ static void __init u300_timer_init_of(struct device_node *np) * TODO: init and register the rest of the timers too, they can be * used by hrtimers! */ + return 0; } -CLOCKSOURCE_OF_DECLARE(u300_timer, "stericsson,u300-apptimer", +CLOCKSOURCE_OF_DECLARE_RET(u300_timer, "stericsson,u300-apptimer", u300_timer_init_of); -- 1.9.1