rtc: Limit RTC PIE frequency (6e7a333e) · Commits · 戴 / test

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:

Thomas Gleixner <tglx@linutronix.de> [jstultz: slightly reworked to use RTC_MAX_FREQ value] Signed-off-by:

John Stultz <john.stultz@linaro.org>

drivers/rtc/interface.c

+1 −1

Original line number	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;
		unsigned long flags;

		if (freq <= 0)
		if (freq <= 0 \|\| freq > RTC_MAX_FREQ)
		return -EINVAL;
		retry:
		spin_lock_irqsave(&rtc->irq_task_lock, flags);

include/linux/rtc.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -97,6 +97,9 @@ struct rtc_pll_info {
		#define RTC_AF 0x20 /* Alarm interrupt */
		#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */


		#define RTC_MAX_FREQ 8192

		#ifdef __KERNEL__

		#include <linux/types.h>

Admin message