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    Subject[PATCH] tick: add check for the existence of broadcast clock event device
    From 2f076e1867c8bbb145b74d289358174644d9fed8 Mon Sep 17 00:00:00 2001
    From: Feng Tang <feng.tang@intel.com>
    Date: Fri, 5 Jun 2009 10:36:15 +0800
    Subject: [PATCH] tick: add check for the existence of broadcast clock event device

    Some platform may have no broadcast clock event device, as it use always-on
    external timers for per-cpu timer and has no extra one for broadcast device.
    This check will secure the access to bc device when system get some boradcast
    on/off and enter/exit message

    Signed-off-by: Feng Tang <feng.tang@intel.com>
    ---
    kernel/time/tick-broadcast.c | 8 +++++++-
    1 files changed, 7 insertions(+), 1 deletions(-)

    diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
    index 118a3b3..110e0bc 100644
    --- a/kernel/time/tick-broadcast.c
    +++ b/kernel/time/tick-broadcast.c
    @@ -214,10 +214,13 @@ static void tick_do_broadcast_on_off(void *why)

    spin_lock_irqsave(&tick_broadcast_lock, flags);

    + bc = tick_broadcast_device.evtdev;
    + if (!bc)
    + goto out;
    +
    cpu = smp_processor_id();
    td = &per_cpu(tick_cpu_device, cpu);
    dev = td->evtdev;
    - bc = tick_broadcast_device.evtdev;

    /*
    * Is the device not affected by the powerstate ?
    @@ -468,6 +471,9 @@ void tick_broadcast_oneshot_control(unsigned long reason)
    goto out;

    bc = tick_broadcast_device.evtdev;
    + if (!bc)
    + goto out;
    +
    cpu = smp_processor_id();
    td = &per_cpu(tick_cpu_device, cpu);
    dev = td->evtdev;
    --
    1.5.6.3

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