Wei, Gang
2010-May-18 10:29 UTC
[Xen-devel] [PATCH]x86-hpet: fix booting NULL pointer panic introduced by c/s 21398
x86-hpet: fix booting NULL pointer panic introduced by c/s 21398.
(XEN) Xen call trace:
(XEN) [<ffff82c48011fb27>] check_lock+0x19/0x49
(XEN) [<ffff82c48011ff2a>] _spin_lock_irq+0x28/0x4a
(XEN) [<ffff82c48018fd6d>] hpet_broadcast_exit+0x92/0x1f0
(XEN) [<ffff82c4801920b2>] acpi_processor_idle+0x62c/0x6e6
(XEN) [<ffff82c48014e1a1>] idle_loop+0x62/0x73
Signed-off-by: Wei Gang <gang.wei@intel.com>
diff -r e4028345ad48 xen/arch/x86/hpet.c
--- a/xen/arch/x86/hpet.c Mon May 17 18:52:01 2010 +0100
+++ b/xen/arch/x86/hpet.c Wed May 19 02:16:41 2010 +0800
@@ -684,6 +684,9 @@ void hpet_broadcast_exit(void)
if ( this_cpu(timer_deadline_start) == 0 )
return;
+ if ( !ch )
+ ch = hpet_get_channel(cpu);
+
/* Reprogram the deadline; trigger timer work now if it has passed. */
enable_APIC_timer();
if ( !reprogram_timer(this_cpu(timer_deadline_start)) )
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