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tick/broadcast: Prevent deep idle if no broadcast device available

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Add a check for a installed broadcast device to the oneshot control
function and return busy if not.

[ Split out from a larger combo patch ]

Reported-and-tested-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Suzuki Poulose <Suzuki.Poulose@arm.com>
Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Cc: Catalin Marinas <Catalin.Marinas@arm.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1507070929360.3916@nanos
This commit is contained in:
Thomas Gleixner 2015-07-07 16:34:32 +02:00
parent f32dd11705
commit b78f3f3c89
1 changed files with 7 additions and 0 deletions
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7
kernel/time/tick-broadcast.c
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@ -692,6 +692,13 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
int cpu, ret = 0;
ktime_t now;
/*
* If there is no broadcast device, tell the caller not to go
* into deep idle.
*/
if (!tick_broadcast_device.evtdev)
return -EBUSY;
/*
* Periodic mode does not care about the enter/exit of power
* states