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Commit 6e7a333e authored by Thomas Gleixner's avatar Thomas Gleixner Committed by John Stultz
Browse files

rtc: Limit RTC PIE frequency 



The RTC pie hrtimer is self rearming. We really need to limit the
frequency to something sensible. Thus limit it to the 8192Hz max
value from the rtc man documentation

Cc: Willy Tarreau <w@1wt.eu>
Cc: stable@kernel.org
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
[jstultz: slightly reworked to use RTC_MAX_FREQ value]
Signed-off-by: default avatarJohn Stultz <john.stultz@linaro.org>
parent 3c8bb90e

drivers/rtc/interface.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -708,7 +708,7 @@ int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq) 
	int err = 0;

	int err = 0;

	unsigned long flags;

	unsigned long flags;





	if (freq <= 0)

	if (freq <= 0 || freq > RTC_MAX_FREQ)

		return -EINVAL;

		return -EINVAL;

retry:

retry:

	spin_lock_irqsave(&rtc->irq_task_lock, flags);

	spin_lock_irqsave(&rtc->irq_task_lock, flags);

include/linux/rtc.h

+3 −0
Original line number Original line Diff line number Diff line
@@ -97,6 +97,9 @@ struct rtc_pll_info { 
#define RTC_AF 0x20	/* Alarm interrupt */

#define RTC_AF 0x20	/* Alarm interrupt */

#define RTC_UF 0x10	/* Update interrupt for 1Hz RTC */

#define RTC_UF 0x10	/* Update interrupt for 1Hz RTC */







#define RTC_MAX_FREQ	8192



#ifdef __KERNEL__

#ifdef __KERNEL__





#include <linux/types.h>

#include <linux/types.h>