Eric Lee / linux-smarc-t335x-v3.2

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Commit 6e7a333eaa522ef73be01caec7a01521490aaf00

Authored by Thomas Gleixner
Committed by John Stultz
1 parent 3c8bb90efb
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

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: Thomas Gleixner <tglx@linutronix.de>
[jstultz: slightly reworked to use RTC_MAX_FREQ value]
Signed-off-by: John Stultz <john.stultz@linaro.org>

Showing 2 changed files with 4 additions and 1 deletions Side-by-side Diff

drivers/rtc/interface.c
Diff comments   View file @ 6e7a333
... ... @@ -708,7 +708,7 @@
708 708 int err = 0;
709 709 unsigned long flags;
710 710  
711   - if (freq <= 0)
  711 + if (freq <= 0 || freq > RTC_MAX_FREQ)
712 712 return -EINVAL;
713 713 retry:
714 714 spin_lock_irqsave(&rtc->irq_task_lock, flags);
... ... @@ -97,6 +97,9 @@
97 97 #define RTC_AF 0x20 /* Alarm interrupt */
98 98 #define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */
99 99  
  100 +
  101 +#define RTC_MAX_FREQ 8192
  102 +
100 103 #ifdef __KERNEL__
101 104  
102 105 #include <linux/types.h>