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x86: fix RTC lockdep warning: potential hardirq recursion

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After disabling both CONFIG_DEBUG_LOCKING_API_SELFTESTS and netconsole
(using current mainline) I get a login prompt, and also...

[    5.181668] SELinux: policy loaded with handle_unknown=deny
[    5.183315] type=1403 audit(1202100038.157:3): policy loaded auid=4294967295 ses=4294967295
[    5.822073] SELinux: initialized (dev usbfs, type usbfs), uses genfs_contexts
[    7.819146] ------------[ cut here ]------------
[    7.819146] WARNING: at kernel/lockdep.c:2033 trace_hardirqs_on+0x9b/0x10d()
[    7.819146] Modules linked in: generic ext3 jbd ide_disk ide_core
[    7.819146] Pid: 399, comm: hwclock Not tainted 2.6.24 #4
[    7.819146]  [<c011d140>] warn_on_slowpath+0x41/0x51
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c013770c>] ? check_usage_forwards+0x19/0x3b
[    7.819146]  [<c01390c4>] ? __lock_acquire+0xac3/0xb0b
[    7.819146]  [<c0108c98>] ? native_sched_clock+0x8b/0x9f
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c030ca6c>] ? _spin_unlock_irq+0x22/0x42
[    7.819146]  [<c013848b>] trace_hardirqs_on+0x9b/0x10d
[    7.819146]  [<c030ca6c>] _spin_unlock_irq+0x22/0x42
[    7.819146]  [<c011481e>] hpet_rtc_interrupt+0xdf/0x290
[    7.819146]  [<c014ea90>] handle_IRQ_event+0x1a/0x46
[    7.819146]  [<c014f8ea>] handle_edge_irq+0xbe/0xff
[    7.819146]  [<c0106e08>] do_IRQ+0x6d/0x84
[    7.819146]  [<c0105596>] common_interrupt+0x2e/0x34
[    7.819146]  [<c013007b>] ? ktime_get_ts+0x8/0x3f
[    7.819146]  [<c0139420>] ? lock_release+0x167/0x16f
[    7.819146]  [<c017974a>] ? core_sys_select+0x2c/0x327
[    7.819146]  [<c0179792>] core_sys_select+0x74/0x327
[    7.819146]  [<c0108c98>] ? native_sched_clock+0x8b/0x9f
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c030ca6c>] ? _spin_unlock_irq+0x22/0x42
[    7.819146]  [<c01384d6>] ? trace_hardirqs_on+0xe6/0x10d
[    7.819146]  [<c030ca77>] ? _spin_unlock_irq+0x2d/0x42
[    7.819146]  [<c023b437>] ? rtc_do_ioctl+0x11b/0x677
[    7.819146]  [<c01c487e>] ? inode_has_perm+0x5e/0x68
[    7.819146]  [<c01364a9>] ? lock_release_holdtime+0x50/0x56
[    7.819146]  [<c0108c98>] ? native_sched_clock+0x8b/0x9f
[    7.819146]  [<c01c490b>] ? file_has_perm+0x83/0x8c
[    7.819146]  [<c023ba08>] ? rtc_ioctl+0xf/0x11
[    7.819146]  [<c017898d>] ? do_ioctl+0x55/0x67
[    7.819146]  [<c0179d15>] sys_select+0x93/0x163
[    7.819146]  [<c0104b39>] ? sysenter_past_esp+0x9a/0xa5
[    7.819146]  [<c0104afe>] sysenter_past_esp+0x5f/0xa5
[    7.819146]  =======================
[    7.819146] ---[ end trace 96540ca301ffb84c ]---
[    7.819210] rtc: lost 6 interrupts
[    7.870668] type=1400 audit(1202128840.794:4): avc:  denied  { audit_write } for  pid=399 comm="hwclock" capability=29 scontext=system_u:system_r:hwclock_t:s0 tcontext=system_u:system_r:hwclock_t:s0 tclass=capability
[    9.538866] input: PC Speaker as /class/input/input5

Because hpet_rtc_interrupt()'s call to get_rtc_time() ends up
resolving to include/asm-generic/rtc.h's (hilariously inlined)
get_rtc_time(), which does spin_unlock_irq() from hard IRQ context.

The obvious patch fixes it.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Andrew Morton 2008-02-04 16:48:10 +01:00 committed by Ingo Molnar
parent 7b610eec7a
commit 795d45b22c
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/asm-generic/rtc.h
View File

@ -35,10 +35,11 @@
static inline unsigned char rtc_is_updating(void) static inline unsigned char rtc_is_updating(void)
{ {
unsigned char uip; unsigned char uip;
unsigned long flags;
spin_lock_irq(&rtc_lock); spin_lock_irqsave(&rtc_lock, flags);
uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP); uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP);
spin_unlock_irq(&rtc_lock); spin_unlock_irqrestore(&rtc_lock, flags);
return uip; return uip;
} }
@ -46,6 +47,8 @@ static inline unsigned int get_rtc_time(struct rtc_time *time)
{ {
unsigned long uip_watchdog = jiffies; unsigned long uip_watchdog = jiffies;
unsigned char ctrl; unsigned char ctrl;
unsigned long flags;
#ifdef CONFIG_MACH_DECSTATION #ifdef CONFIG_MACH_DECSTATION
unsigned int real_year; unsigned int real_year;
#endif #endif
@ -72,7 +75,7 @@ static inline unsigned int get_rtc_time(struct rtc_time *time)
* RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
* by the RTC when initially set to a non-zero value. * by the RTC when initially set to a non-zero value.
*/ */
spin_lock_irq(&rtc_lock); spin_lock_irqsave(&rtc_lock, flags);
time->tm_sec = CMOS_READ(RTC_SECONDS); time->tm_sec = CMOS_READ(RTC_SECONDS);
time->tm_min = CMOS_READ(RTC_MINUTES); time->tm_min = CMOS_READ(RTC_MINUTES);
time->tm_hour = CMOS_READ(RTC_HOURS); time->tm_hour = CMOS_READ(RTC_HOURS);
@ -83,7 +86,7 @@ static inline unsigned int get_rtc_time(struct rtc_time *time)
real_year = CMOS_READ(RTC_DEC_YEAR); real_year = CMOS_READ(RTC_DEC_YEAR);
#endif #endif
ctrl = CMOS_READ(RTC_CONTROL); ctrl = CMOS_READ(RTC_CONTROL);
spin_unlock_irq(&rtc_lock); spin_unlock_irqrestore(&rtc_lock, flags);
if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD) if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
{ {