From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755292AbcFPV2r (ORCPT ); Thu, 16 Jun 2016 17:28:47 -0400 Received: from mail-wm0-f41.google.com ([74.125.82.41]:35168 "EHLO mail-wm0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755270AbcFPV2n (ORCPT ); Thu, 16 Jun 2016 17:28:43 -0400 From: Daniel Lezcano To: daniel.lezcano@linaro.org, tglx@linutronix.de Cc: linux-kernel@vger.kernel.org Subject: [PATCH V2 30/63] clocksource/drivers/sun4i_time: Convert init function to return error Date: Thu, 16 Jun 2016 23:26:49 +0200 Message-Id: <1466112442-31105-31-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/samsung_pwm_timer.c | 60 ++++++++++++++++++--------------- 1 file changed, 32 insertions(+), 28 deletions(-) diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c index 503a2f7..27a9797 100644 --- a/drivers/clocksource/samsung_pwm_timer.c +++ b/drivers/clocksource/samsung_pwm_timer.c @@ -333,11 +333,10 @@ static u64 notrace samsung_read_sched_clock(void) return samsung_clocksource_read(NULL); } -static void __init samsung_clocksource_init(void) +static int __init samsung_clocksource_init(void) { unsigned long pclk; unsigned long clock_rate; - int ret; pclk = clk_get_rate(pwm.timerclk); @@ -358,9 +357,7 @@ static void __init samsung_clocksource_init(void) pwm.variant.bits, clock_rate); samsung_clocksource.mask = CLOCKSOURCE_MASK(pwm.variant.bits); - ret = clocksource_register_hz(&samsung_clocksource, clock_rate); - if (ret) - panic("samsung_clocksource_timer: can't register clocksource\n"); + return clocksource_register_hz(&samsung_clocksource, clock_rate); } static void __init samsung_timer_resources(void) @@ -380,26 +377,31 @@ static void __init samsung_timer_resources(void) /* * PWM master driver */ -static void __init _samsung_pwm_clocksource_init(void) +static int __init _samsung_pwm_clocksource_init(void) { u8 mask; int channel; mask = ~pwm.variant.output_mask & ((1 << SAMSUNG_PWM_NUM) - 1); channel = fls(mask) - 1; - if (channel < 0) - panic("failed to find PWM channel for clocksource"); + if (channel < 0) { + pr_crit("failed to find PWM channel for clocksource"); + return -EINVAL; + } pwm.source_id = channel; mask &= ~(1 << channel); channel = fls(mask) - 1; - if (channel < 0) - panic("failed to find PWM channel for clock event"); + if (channel < 0) { + pr_crit("failed to find PWM channel for clock event"); + return -EINVAL; + } pwm.event_id = channel; samsung_timer_resources(); samsung_clockevent_init(); - samsung_clocksource_init(); + + return samsung_clocksource_init(); } void __init samsung_pwm_clocksource_init(void __iomem *base, @@ -417,8 +419,8 @@ void __init samsung_pwm_clocksource_init(void __iomem *base, } #ifdef CONFIG_CLKSRC_OF -static void __init samsung_pwm_alloc(struct device_node *np, - const struct samsung_pwm_variant *variant) +static int __init samsung_pwm_alloc(struct device_node *np, + const struct samsung_pwm_variant *variant) { struct property *prop; const __be32 *cur; @@ -441,14 +443,16 @@ static void __init samsung_pwm_alloc(struct device_node *np, pwm.base = of_iomap(np, 0); if (!pwm.base) { pr_err("%s: failed to map PWM registers\n", __func__); - return; + return -ENXIO; } pwm.timerclk = of_clk_get_by_name(np, "timers"); - if (IS_ERR(pwm.timerclk)) - panic("failed to get timers clock for timer"); + if (IS_ERR(pwm.timerclk)) { + pr_crit("failed to get timers clock for timer"); + return PTR_ERR(pwm.timerclk); + } - _samsung_pwm_clocksource_init(); + return _samsung_pwm_clocksource_init(); } static const struct samsung_pwm_variant s3c24xx_variant = { @@ -458,11 +462,11 @@ static const struct samsung_pwm_variant s3c24xx_variant = { .tclk_mask = (1 << 4), }; -static void __init s3c2410_pwm_clocksource_init(struct device_node *np) +static int __init s3c2410_pwm_clocksource_init(struct device_node *np) { - samsung_pwm_alloc(np, &s3c24xx_variant); + return samsung_pwm_alloc(np, &s3c24xx_variant); } -CLOCKSOURCE_OF_DECLARE(s3c2410_pwm, "samsung,s3c2410-pwm", s3c2410_pwm_clocksource_init); +CLOCKSOURCE_OF_DECLARE_RET(s3c2410_pwm, "samsung,s3c2410-pwm", s3c2410_pwm_clocksource_init); static const struct samsung_pwm_variant s3c64xx_variant = { .bits = 32, @@ -471,11 +475,11 @@ static const struct samsung_pwm_variant s3c64xx_variant = { .tclk_mask = (1 << 7) | (1 << 6) | (1 << 5), }; -static void __init s3c64xx_pwm_clocksource_init(struct device_node *np) +static int __init s3c64xx_pwm_clocksource_init(struct device_node *np) { - samsung_pwm_alloc(np, &s3c64xx_variant); + return samsung_pwm_alloc(np, &s3c64xx_variant); } -CLOCKSOURCE_OF_DECLARE(s3c6400_pwm, "samsung,s3c6400-pwm", s3c64xx_pwm_clocksource_init); +CLOCKSOURCE_OF_DECLARE_RET(s3c6400_pwm, "samsung,s3c6400-pwm", s3c64xx_pwm_clocksource_init); static const struct samsung_pwm_variant s5p64x0_variant = { .bits = 32, @@ -484,11 +488,11 @@ static const struct samsung_pwm_variant s5p64x0_variant = { .tclk_mask = 0, }; -static void __init s5p64x0_pwm_clocksource_init(struct device_node *np) +static int __init s5p64x0_pwm_clocksource_init(struct device_node *np) { - samsung_pwm_alloc(np, &s5p64x0_variant); + return samsung_pwm_alloc(np, &s5p64x0_variant); } -CLOCKSOURCE_OF_DECLARE(s5p6440_pwm, "samsung,s5p6440-pwm", s5p64x0_pwm_clocksource_init); +CLOCKSOURCE_OF_DECLARE_RET(s5p6440_pwm, "samsung,s5p6440-pwm", s5p64x0_pwm_clocksource_init); static const struct samsung_pwm_variant s5p_variant = { .bits = 32, @@ -497,9 +501,9 @@ static const struct samsung_pwm_variant s5p_variant = { .tclk_mask = (1 << 5), }; -static void __init s5p_pwm_clocksource_init(struct device_node *np) +static int __init s5p_pwm_clocksource_init(struct device_node *np) { return samsung_pwm_alloc(np, &s5p_variant); } -CLOCKSOURCE_OF_DECLARE(s5pc100_pwm, "samsung,s5pc100-pwm", s5p_pwm_clocksource_init); +CLOCKSOURCE_OF_DECLARE_RET(s5pc100_pwm, "samsung,s5pc100-pwm", s5p_pwm_clocksource_init); #endif -- 1.9.1