rtc: Fix RTC PIE frequency limit

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: stable@kernel.org Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: John Stultz <john.stultz@linaro.org>
git-mirror · Aug 10, 2011 · 938f97b · 938f97b
1 parent 34d623d
commit 938f97b
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Showing 2 changed files with 4 additions and 1 deletion.
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
@@ -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 || freq > 5000)
+	if (freq <= 0 || freq > RTC_MAX_FREQ)
 		return -EINVAL;
 retry:
 	spin_lock_irqsave(&rtc->irq_task_lock, flags);

diff --git a/include/linux/rtc.h b/include/linux/rtc.h
@@ -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>