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| author | Thomas Gleixner <tglx@linutronix.de> | 2015-07-07 16:34:32 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2015-07-07 18:46:47 +0200 |
| commit | b78f3f3c898c824bf56ab55cfa59fc72be49c349 (patch) | |
| tree | 635fbb3deb08581493d2c03be5f7f441de1be9cd /kernel | |
| parent | f32dd117051185da6e923b35491a44d7debeeea5 (diff) | |
| download | linux-b78f3f3c898c824bf56ab55cfa59fc72be49c349.tar.gz linux-b78f3f3c898c824bf56ab55cfa59fc72be49c349.tar.bz2 linux-b78f3f3c898c824bf56ab55cfa59fc72be49c349.zip | |
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')
| -rw-r--r-- | kernel/time/tick-broadcast.c | 7 |
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 */ |