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[78.210.255.2]) by smtp.gmail.com with ESMTPSA id x128sm16705606wmf.6.2016.06.16.14.28.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 16 Jun 2016 14:28:51 -0700 (PDT) From: Daniel Lezcano To: daniel.lezcano@linaro.org, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org Subject: [PATCH V2 37/63] clocksource/drivers/time-pistachio: Convert init function to return error Date: Thu, 16 Jun 2016 23:26:56 +0200 Message-Id: <1466112442-31105-38-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 Precedence: bulk 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/time-orion.c | 52 ++++++++++++++++++++++++++++------------ 1 file changed, 37 insertions(+), 15 deletions(-) -- 1.9.1 diff --git a/drivers/clocksource/time-orion.c b/drivers/clocksource/time-orion.c index 0ece742..5fdeb5d 100644 --- a/drivers/clocksource/time-orion.c +++ b/drivers/clocksource/time-orion.c @@ -104,25 +104,36 @@ static struct irqaction orion_clkevt_irq = { .handler = orion_clkevt_irq_handler, }; -static void __init orion_timer_init(struct device_node *np) +static int __init orion_timer_init(struct device_node *np) { struct clk *clk; - int irq; + int irq, ret; /* timer registers are shared with watchdog timer */ timer_base = of_iomap(np, 0); - if (!timer_base) - panic("%s: unable to map resource\n", np->name); + if (!timer_base) { + pr_err("%s: unable to map resource\n", np->name); + return -ENXIO; + } clk = of_clk_get(np, 0); - if (IS_ERR(clk)) - panic("%s: unable to get clk\n", np->name); - clk_prepare_enable(clk); + if (IS_ERR(clk)) { + pr_err("%s: unable to get clk\n", np->name); + return PTR_ERR(clk); + } + + ret = clk_prepare_enable(clk); + if (ret) { + pr_err("Failed to prepare clock"); + return ret; + } /* we are only interested in timer1 irq */ irq = irq_of_parse_and_map(np, 1); - if (irq <= 0) - panic("%s: unable to parse timer1 irq\n", np->name); + if (irq <= 0) { + pr_err("%s: unable to parse timer1 irq\n", np->name); + return -EINVAL; + } /* setup timer0 as free-running clocksource */ writel(~0, timer_base + TIMER0_VAL); @@ -130,19 +141,30 @@ static void __init orion_timer_init(struct device_node *np) atomic_io_modify(timer_base + TIMER_CTRL, TIMER0_RELOAD_EN | TIMER0_EN, TIMER0_RELOAD_EN | TIMER0_EN); - clocksource_mmio_init(timer_base + TIMER0_VAL, "orion_clocksource", - clk_get_rate(clk), 300, 32, - clocksource_mmio_readl_down); + + ret = clocksource_mmio_init(timer_base + TIMER0_VAL, "orion_clocksource", + clk_get_rate(clk), 300, 32, + clocksource_mmio_readl_down); + if (ret) { + pr_err("Failed to initialize mmio timer"); + return ret; + } + sched_clock_register(orion_read_sched_clock, 32, clk_get_rate(clk)); /* setup timer1 as clockevent timer */ - if (setup_irq(irq, &orion_clkevt_irq)) - panic("%s: unable to setup irq\n", np->name); + ret = setup_irq(irq, &orion_clkevt_irq); + if (ret) { + pr_err("%s: unable to setup irq\n", np->name); + return ret; + } ticks_per_jiffy = (clk_get_rate(clk) + HZ/2) / HZ; orion_clkevt.cpumask = cpumask_of(0); orion_clkevt.irq = irq; clockevents_config_and_register(&orion_clkevt, clk_get_rate(clk), ORION_ONESHOT_MIN, ORION_ONESHOT_MAX); + + return 0; } -CLOCKSOURCE_OF_DECLARE(orion_timer, "marvell,orion-timer", orion_timer_init); +CLOCKSOURCE_OF_DECLARE_RET(orion_timer, "marvell,orion-timer", orion_timer_init);