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[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@xxxxxxxxx>

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)) )

Attachment: hpet-fix.patch
Description: hpet-fix.patch

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