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From: Daniel Lezcano <daniel.lezcano@linaro.org>
To: tglx@linutronix.de, daniel.lezcano@linaro.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH 50/93] clocksource/drivers/atmel-pit: Convert init function to return error
Date: Thu,  7 Jul 2016 10:01:23 +0200
Message-ID: <1467878526-1238-50-git-send-email-daniel.lezcano@linaro.org> (raw)
In-Reply-To: <1467878526-1238-1-git-send-email-daniel.lezcano@linaro.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 <daniel.lezcano@linaro.org>
---
 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 d911c5d..ffaca7c 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);
-- 
1.9.1

  parent reply index

Thread overview: 78+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-07  7:59 [GIT PULL] clockevents for 4.8 Daniel Lezcano
2016-07-07  8:00 ` [PATCH 01/93] clocksource/drivers/armada-370-xp: Make syscore_ops static Daniel Lezcano
2016-07-07  8:00   ` [PATCH 02/93] clocksource/drivers/digicolor: Fix warning of non-static function Daniel Lezcano
2016-07-07  8:00   ` [PATCH 03/93] clocksource/drivers/samsung_pwm_timer: Fix endian accessors Daniel Lezcano
2016-07-07  8:00   ` [PATCH 04/93] clocksource/drivers/samsung_pwm: Fix typo in Kconfig Daniel Lezcano
2016-07-07  8:00   ` [PATCH 05/93] dt-bindings: Document rk3399 rk-timer bindings Daniel Lezcano
2016-07-07  8:00   ` [PATCH 06/93] clocksource/drivers/rockchip: Add the dynamic irq flag to the timer Daniel Lezcano
2016-07-07  8:00   ` [PATCH 07/93] clocksource/drivers/rockchip: Add support for the rk3399 SoC Daniel Lezcano
2016-07-07  8:00   ` [PATCH 08/93] arm64: dts: rockchip: Add rktimer device node for rk3399 Daniel Lezcano
2016-07-07  8:00   ` [PATCH 09/93] clocksource/drivers/oxnas-rps: Add Oxford Semiconductor RPS Dual Timer Daniel Lezcano
2016-07-07  8:00   ` [PATCH 10/93] dt-bindings: clocksource: Add Oxford Semiconductor RPS Timer bindings Daniel Lezcano
2016-07-07  8:00   ` [PATCH 11/93] of: Add a new macro to declare_of for one parameter function returning a value Daniel Lezcano
2016-07-07  8:00   ` [PATCH 12/93] clocksource/drivers/clksrc-probe: Introduce init functions with return code Daniel Lezcano
2016-07-07  8:00   ` [PATCH 13/93] clocksource/drivers/rockchip_timer: Convert init function to return error Daniel Lezcano
2016-07-07  8:00   ` [PATCH 14/93] clocksource/drivers/mtk_timer: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 15/93] clocksource/drivers/exynos_mct: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 16/93] clocksource/drivers/asm9260: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 17/93] clocksource/drivers/cadence_ttc: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 18/93] clocksource/drivers/st_lpc: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 19/93] clocksource/drivers/dw_apb_timer: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 20/93] clocksource/drivers/clps711x: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 21/93] clocksource/drivers/digicolor: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 22/93] clocksource/drivers/armv7m_systick: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 23/93] clocksource/drivers/bcm2835_timer: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 24/93] clocksource/drivers/bcm_kona: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 25/93] clocksource/drivers/clksrc-dbx500: " Daniel Lezcano
2016-07-07  8:00   ` [PATCH 26/93] clocksource/drivers/fsl_ftm_timer: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 27/93] clocksource/drivers/arm_arch_timer: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 28/93] clocksource/drivers/arm_global_timer: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 29/93] clocksource/drivers/h8300_timer16: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 30/93] clocksource/drivers/h8300_timer8: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 31/93] clocksource/drivers/h8300_tpu: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 32/93] clocksource/drivers/meson6_timer.c: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 33/93] clocksource/drivers/mips-gic-timer: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 34/93] clocksource/drivers/moxart: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 35/93] clocksource/drivers/mps2-timer: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 36/93] clocksource/drivers/mxs: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 37/93] clocksource/drivers/nomadik-mtu: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 38/93] clocksource/drivers/pxa: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 39/93] clocksource/drivers/qcom: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 40/93] clocksource/drivers/samsung_pwm: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 41/93] clocksource/drivers/sun4i: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 42/93] clocksource/drivers/tango_xtal: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 43/93] clocksource/drivers/tegra20: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 44/93] clocksource/drivers/time-armada-370-xp: " Daniel Lezcano
2016-07-12 15:11     ` Anna-Maria Gleixner
2016-07-12 15:18       ` Thomas Gleixner
2016-07-12 15:33       ` Anna-Maria Gleixner
2016-07-12 15:40         ` [tip:timers/core] clocksource/drivers/time-armada-370-xp: Fix return value check tip-bot for Anna-Maria Gleixner
2016-07-07  8:01   ` [PATCH 45/93] clocksource/drivers/time-efm32: Convert init function to return error Daniel Lezcano
2016-07-07  8:01   ` [PATCH 46/93] clocksource/drivers/time-lpc32xx: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 47/93] clocksource/drivers/orion: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 48/93] clocksource/drivers/pistachio: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 49/93] clocksource/drivers/atlas7: " Daniel Lezcano
2016-07-07  8:01   ` Daniel Lezcano [this message]
2016-07-07  8:01   ` [PATCH 51/93] clocksource/drivers/atmel-st: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 52/93] clocksource/drivers/prima2: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 53/93] clocksource/drivers/imx-gpt: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 54/93] clocksource/drivers/integrator-ap: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 55/93] clocksource/drivers/keystone: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 56/93] clocksource/drivers/sp804: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 57/93] clocksource/drivers/stm32: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 58/93] clocksource/drivers/sun5i: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 59/93] clocksource/drivers/ti-32k: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 60/93] clocksource/drivers/u300: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 61/93] clocksource/drivers/versatile: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 62/93] clocksource/drivers/vf_pit_timer: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 63/93] clocksource/drivers/vt8500: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 64/93] clocksource/drivers/zevio: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 65/93] clocksource/drivers/microblaze: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 66/93] clocksource/drivers/ralink: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 67/93] clocksource/drivers/nios2: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 68/93] clocksource/drivers/smp_twd: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 69/93] clocksource/drivers/nps: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 70/93] clocksource/drivers/arc: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 71/93] clocksource/drivers/oxnas-rps: " Daniel Lezcano
2016-07-07  8:01   ` [PATCH 72/93] clocksources: Switch back to the clksrc table Daniel Lezcano
2016-07-07  8:01   ` [PATCH 73/93] clk: Add missing clk_get_sys() stub Daniel Lezcano

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