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rtc: Fix RTC PIE frequency limit

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commit 938f97bcf1bdd1b681d5d14d1d7117a2e22d4434 upstream.

Thomas earlier submitted a fix to limit the RTC PIE freq, but
picked 5000Hz out of the air. Willy noticed that we should
instead use the 8192Hz max from the rtc man documentation.

Cc: Willy Tarreau <w@1wt.eu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
John Stultz
2011-07-22 09:12:51 +00:00
committed by Greg Kroah-Hartman
parent c3a44b4d23
commit 1ed2053563
2 changed files with 4 additions and 1 deletions
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2
drivers/rtc/interface.c
View File

@@ -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 || freq > 5000) 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);

3
include/linux/rtc.h
View File

@@ -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>