diff options
| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2006-09-25 16:24:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-25 17:38:35 -0700 |
| commit | 0b16f21f144010aa627c58b3a33be49ebfd685dc (patch) | |
| tree | e2b970e49cf2dda7fa1d582c2ea4e67c99439c5c /drivers/char/rtc.c | |
| parent | c0ba7e5147829eaa607351997bccd06200a8db12 (diff) | |
| download | lwn-0b16f21f144010aa627c58b3a33be49ebfd685dc.tar.gz lwn-0b16f21f144010aa627c58b3a33be49ebfd685dc.zip | |
[PATCH] rtc: lockdep fix/workaround
BUG: warning at kernel/lockdep.c:1816/trace_hardirqs_on() (Not tainted)
[<c04051ee>] show_trace_log_lvl+0x58/0x171
[<c0405802>] show_trace+0xd/0x10
[<c040591b>] dump_stack+0x19/0x1b
[<c043abee>] trace_hardirqs_on+0xa2/0x11e
[<c06143c3>] _spin_unlock_irq+0x22/0x26
[<c0541540>] rtc_get_rtc_time+0x32/0x176
[<c0419ba4>] hpet_rtc_interrupt+0x92/0x14d
[<c0450f94>] handle_IRQ_event+0x20/0x4d
[<c0451055>] __do_IRQ+0x94/0xef
[<c040678d>] do_IRQ+0x9e/0xbd
[<c0404a49>] common_interrupt+0x25/0x2c
DWARF2 unwinder stuck at common_interrupt+0x25/0x2c
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/rtc.c')
| -rw-r--r-- | drivers/char/rtc.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c index 6e6a7c7a7eff..ab6429b4a84e 100644 --- a/drivers/char/rtc.c +++ b/drivers/char/rtc.c @@ -209,11 +209,12 @@ static const unsigned char days_in_mo[] = */ static inline unsigned char rtc_is_updating(void) { + unsigned long flags; unsigned char uip; - spin_lock_irq(&rtc_lock); + spin_lock_irqsave(&rtc_lock, flags); uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); - spin_unlock_irq(&rtc_lock); + spin_unlock_irqrestore(&rtc_lock, flags); return uip; } |