[BUG] ARM Architected timers appear broken in 3.9-rc1

[Jon Medhurst (Tixy)]

Hi Mark

When booting Versatile Express TC2 I am getting a null pointer
dereference which appears to be related to the recent changes in
architected timer support. 

The interesting part of the call stack is below (the full log is
attached). It shows that whilst entering CPU idle the code is calling
the NULL set_next_event function on the dummy timer setup by
broadcast_timer_setup.

I've also attached the kernel config I'm using and the code is at
git://git.linaro.org/people/tixy/kernel.git branch arch-timer-bug.

[    5.250325] PC is at 0x0
[    5.250336] LR is at clockevents_program_event+0x99/0xf4
[...]
[    5.250448] [<c004e1d5>] (clockevents_program_event+0x99/0xf4) from [<c004e8a9>] (tick_broadcast_set_event+0x35/0x3c)
[    5.250459] [<c004e8a9>] (tick_broadcast_set_event+0x35/0x3c) from [<c004ee25>] (tick_broadcast_oneshot_control+0x9d/0xd8)
[    5.250468] [<c004ee25>] (tick_broadcast_oneshot_control+0x9d/0xd8) from [<c004e72f>] (tick_notify+0x18b/0x2d0)
[    5.250477] [<c004e72f>] (tick_notify+0x18b/0x2d0) from [<c0036679>] (notifier_call_chain+0x45/0x54)
[    5.250485] [<c0036679>] (notifier_call_chain+0x45/0x54) from [<c0036713>] (raw_notifier_call_chain+0x17/0x1c)
[    5.250493] [<c0036713>] (raw_notifier_call_chain+0x17/0x1c) from [<c004de3d>] (clockevents_notify+0x25/0x10c)
[    5.250503] [<c004de3d>] (clockevents_notify+0x25/0x10c) from [<c02ef51b>] (bl_enter_powerdown+0x2b/0x9c)
[    5.250513] [<c02ef51b>] (bl_enter_powerdown+0x2b/0x9c) from [<c02edec5>] (cpuidle_enter+0xd/0x10)
[    5.250523] [<c02edec5>] (cpuidle_enter+0xd/0x10) from [<c02ee1e9>] (cpuidle_enter_state+0x11/0x50)
[    5.250532] [<c02ee1e9>] (cpuidle_enter_state+0x11/0x50) from [<c02ee293>] (cpuidle_idle_call+0x6b/0x10c)
[    5.250543] [<c02ee293>] (cpuidle_idle_call+0x6b/0x10c) from [<c000da41>] (cpu_idle+0x3d/0xd8)
[    5.250550] [<c000da41>] (cpu_idle+0x3d/0xd8) from [<803d90c9>] (0x803d90c9)

-- 
Tixy
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