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authorThomas Gleixner <tglx@linutronix.de>2015-07-07 16:34:32 +0200
committerThomas Gleixner <tglx@linutronix.de>2015-07-07 18:46:47 +0200
commitb78f3f3c898c824bf56ab55cfa59fc72be49c349 (patch)
tree635fbb3deb08581493d2c03be5f7f441de1be9cd /kernel/time
parentf32dd117051185da6e923b35491a44d7debeeea5 (diff)
tick/broadcast: Prevent deep idle if no broadcast device available
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
Diffstat (limited to 'kernel/time')
-rw-r--r--kernel/time/tick-broadcast.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index ef77b16ad5df..fad3f789beec 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -693,6 +693,13 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
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
*/