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authorPaul Gortmaker <paul.gortmaker@windriver.com>2008-07-10 17:30:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-10 18:04:43 -0700
commit61ca9daa2ca3022dc9cb22bd98e69c1b61e412ad (patch)
tree3f89080946e9ab1fa01f81b3189c32432154c475
parentac310bb5db057963548e067037d68c9be41d0dd0 (diff)
rtc: fix reported IRQ rate for when HPET is enabled
The IRQ rate reported back by the RTC is incorrect when HPET is enabled. Newer hardware that has HPET to emulate the legacy RTC device gets this value wrong since after it sets the rate, it returns before setting the variable used to report the IRQ rate back to users of the device -- so the set rate and the reported rate get out of sync. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: David Brownell <david-b@pacbell.net> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/char/rtc.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index 5f80a9dff57..909cac93fa2 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -678,12 +678,13 @@ static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, int kernel)
if (arg != (1<<tmp))
return -EINVAL;
+ rtc_freq = arg;
+
spin_lock_irqsave(&rtc_lock, flags);
if (hpet_set_periodic_freq(arg)) {
spin_unlock_irqrestore(&rtc_lock, flags);
return 0;
}
- rtc_freq = arg;
val = CMOS_READ(RTC_FREQ_SELECT) & 0xf0;
val |= (16 - tmp);