[PATCH] lockdep: HPET/RTC fix

Joseph Fannin reported that hpet_rtc_interrupt() enables hardirqs
in irq context:

[   25.628000]  [<c014af4e>] trace_hardirqs_on+0xce/0x200
[   25.628000]  [<c036cf21>] _spin_unlock_irq+0x31/0x70
[   25.628000]  [<c0296584>] rtc_get_rtc_time+0x44/0x1a0
[   25.628000]  [<c01198bb>] hpet_rtc_interrupt+0x21b/0x280
[   25.628000]  [<c0161141>] handle_IRQ_event+0x31/0x70
[   25.628000]  [<c0162d37>] handle_edge_irq+0xe7/0x210
[   25.628000]  [<c0106192>] do_IRQ+0x92/0x120
[   25.628000]  [<c0104121>] common_interrupt+0x25/0x2c

the call of rtc_get_rtc_time() is highly suspect. At a minimum we
need the patch below to save/restore hardirq state.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Joseph Fannin <jfannin@gmail.com>
Cc: John Stultz <johnstul@us.ibm.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index 6ccc364c08df..6e6a7c7a7eff 100644
--- a/drivers/char/rtc.c
+++ b/drivers/char/rtc.c
@@ -1245,7 +1245,7 @@ static int rtc_proc_open(struct inode *inode, struct file *file)
 
 void rtc_get_rtc_time(struct rtc_time *rtc_tm)
 {
-        unsigned long uip_watchdog = jiffies;
+        unsigned long uip_watchdog = jiffies, flags;
         unsigned char ctrl;
 #ifdef CONFIG_MACH_DECSTATION
         unsigned int real_year;
@@ -1272,7 +1272,7 @@ void rtc_get_rtc_time(struct rtc_time *rtc_tm)
          * RTC has RTC_DAY_OF_WEEK, we should usually ignore it, as it is
          * only updated by the RTC when initially set to a non-zero value.
          */
-        spin_lock_irq(&rtc_lock);
+        spin_lock_irqsave(&rtc_lock, flags);
         rtc_tm->tm_sec = CMOS_READ(RTC_SECONDS);
         rtc_tm->tm_min = CMOS_READ(RTC_MINUTES);
         rtc_tm->tm_hour = CMOS_READ(RTC_HOURS);
@@ -1286,7 +1286,7 @@ void rtc_get_rtc_time(struct rtc_time *rtc_tm)
         real_year = CMOS_READ(RTC_DEC_YEAR);
 #endif
         ctrl = CMOS_READ(RTC_CONTROL);
-        spin_unlock_irq(&rtc_lock);
+        spin_unlock_irqrestore(&rtc_lock, flags);
 
         if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
         {