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[78.210.255.2]) by smtp.gmail.com with ESMTPSA id a84sm5377403wma.0.2016.06.28.03.33.19 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 28 Jun 2016 03:33:20 -0700 (PDT) From: Daniel Lezcano To: daniel.lezcano@linaro.org, tglx@linutronix.de Subject: [PATCH 23/92] clocksource/drivers/bcm2835_timer: Convert init function to return error Date: Tue, 28 Jun 2016 12:30:42 +0200 Message-Id: <1467109911-11060-23-git-send-email-daniel.lezcano@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1467109911-11060-1-git-send-email-daniel.lezcano@linaro.org> References: <577251A4.7030508@linaro.org> <1467109911-11060-1-git-send-email-daniel.lezcano@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160628_033343_038881_8DB49A99 X-CRM114-Status: GOOD ( 15.51 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eric Anholt , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rpi-kernel@lists.infradead.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP 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 Acked-by: Eric Anholt --- drivers/clocksource/bcm2835_timer.c | 40 +++++++++++++++++++++++++------------ 1 file changed, 27 insertions(+), 13 deletions(-) diff --git a/drivers/clocksource/bcm2835_timer.c b/drivers/clocksource/bcm2835_timer.c index 6f28229..2dcf896 100644 --- a/drivers/clocksource/bcm2835_timer.c +++ b/drivers/clocksource/bcm2835_timer.c @@ -80,19 +80,24 @@ static irqreturn_t bcm2835_time_interrupt(int irq, void *dev_id) } } -static void __init bcm2835_timer_init(struct device_node *node) +static int __init bcm2835_timer_init(struct device_node *node) { void __iomem *base; u32 freq; - int irq; + int irq, ret; struct bcm2835_timer *timer; base = of_iomap(node, 0); - if (!base) - panic("Can't remap registers"); + if (!base) { + pr_err("Can't remap registers"); + return -ENXIO; + } - if (of_property_read_u32(node, "clock-frequency", &freq)) - panic("Can't read clock-frequency"); + ret = of_property_read_u32(node, "clock-frequency", &freq); + if (ret) { + pr_err("Can't read clock-frequency"); + return ret; + } system_clock = base + REG_COUNTER_LO; sched_clock_register(bcm2835_sched_read, 32, freq); @@ -101,12 +106,16 @@ static void __init bcm2835_timer_init(struct device_node *node) freq, 300, 32, clocksource_mmio_readl_up); irq = irq_of_parse_and_map(node, DEFAULT_TIMER); - if (irq <= 0) - panic("Can't parse IRQ"); + if (irq <= 0) { + pr_err("Can't parse IRQ"); + return -EINVAL; + } timer = kzalloc(sizeof(*timer), GFP_KERNEL); - if (!timer) - panic("Can't allocate timer struct\n"); + if (!timer) { + pr_err("Can't allocate timer struct\n"); + return -ENOMEM; + } timer->control = base + REG_CONTROL; timer->compare = base + REG_COMPARE(DEFAULT_TIMER); @@ -121,12 +130,17 @@ static void __init bcm2835_timer_init(struct device_node *node) timer->act.dev_id = timer; timer->act.handler = bcm2835_time_interrupt; - if (setup_irq(irq, &timer->act)) - panic("Can't set up timer IRQ\n"); + ret = setup_irq(irq, &timer->act); + if (ret) { + pr_err("Can't set up timer IRQ\n"); + return ret; + } clockevents_config_and_register(&timer->evt, freq, 0xf, 0xffffffff); pr_info("bcm2835: system timer (irq = %d)\n", irq); + + return 0; } -CLOCKSOURCE_OF_DECLARE(bcm2835, "brcm,bcm2835-system-timer", +CLOCKSOURCE_OF_DECLARE_RET(bcm2835, "brcm,bcm2835-system-timer", bcm2835_timer_init);