[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>

diff --git a/drivers/char/rtc.c b/drivers/char/rtc.c
index 6ccc364..6e6a7c7 100644 (file)
--- 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)
        {