redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

cpuidle / sleep: Do sanity checks in cpuidle_enter_freeze() too 

Modify cpuidle_enter_freeze() to do the sanity checks done by
cpuidle_select() to avoid crashing the suspend-to-idle code
path in case something is missing.

Fixes: 3810631332 (PM / sleep: Re-implement suspend-to-idle handling)
Original-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
hifive-unleashed-5.1
Rafael J. Wysocki 2015-02-27 00:39:56 +01:00
parent 01e04f466e
commit 31a3409065
1 changed files with 16 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/cpuidle/cpuidle.c
View File

@ -44,6 +44,12 @@ void disable_cpuidle(void)
off = 1;
}
static bool cpuidle_not_available(struct cpuidle_driver *drv,
struct cpuidle_device *dev)
{
return off || !initialized || !drv || !dev || !dev->enabled;
}
/**
* cpuidle_play_dead - cpu off-lining
*
@ -126,6 +132,9 @@ void cpuidle_enter_freeze(void)
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(dev);
int index;
if (cpuidle_not_available(drv, dev))
goto fallback;
/*
* Find the deepest state with ->enter_freeze present, which guarantees
* that interrupts won't be enabled when it exits and allows the tick to
@ -143,10 +152,13 @@ void cpuidle_enter_freeze(void)
* at all and try to enter it normally.
*/
index = cpuidle_find_deepest_state(drv, dev, false);
if (index >= 0)
if (index >= 0) {
cpuidle_enter(drv, dev, index);
else
arch_cpu_idle();
return;
}
fallback:
arch_cpu_idle();
}
/**
@ -205,12 +217,9 @@ int cpuidle_enter_state(struct cpuidle_device *dev, struct cpuidle_driver *drv,
*/
int cpuidle_select(struct cpuidle_driver *drv, struct cpuidle_device *dev)
{
if (off || !initialized)
if (cpuidle_not_available(drv, dev))
return -ENODEV;
if (!drv || !dev || !dev->enabled)
return -EBUSY;
return cpuidle_curr_governor->select(drv, dev);
}