With this patch we only schedule the work when in interrupt context.
Before update_request was callable from interrupt-context there was a
1:1 relation between a change in the request-value and a notification.
This patch restores that behaviour for all constraints that have update_request
never called from interrupt context.
The notifier mutex serializes calls to blocking_notifier_call_chain, so
that we are serialized against any pending or currently executing notification.
Signed-off-by: Florian Mickler <florian@xxxxxxxxxxx>
---
kernel/pm_qos_params.c | 10 +++++++---
1 files changed, 7 insertions(+), 3 deletions(-)
diff --git a/kernel/pm_qos_params.c b/kernel/pm_qos_params.c
index 9346906..c06cae9 100644
--- a/kernel/pm_qos_params.c
+++ b/kernel/pm_qos_params.c
@@ -152,11 +152,15 @@ static s32 min_compare(s32 v1, s32 v2)
static void pm_qos_call_notifiers(struct pm_qos_object *o,
unsigned long curr_value)
{
- schedule_work(&o->notify);
-
if (o->atomic_notifiers)
atomic_notifier_call_chain(o->atomic_notifiers,
- curr_value, NULL);
+ (unsigned long) curr_value, NULL);
+
+ if (in_interrupt())
+ schedule_work(&o->notify);
+ else
+ blocking_notifier_call_chain(o->blocking_notifiers,
+ (unsigned long) curr_value, NULL);
}
static void update_notify(struct work_struct *work)
--
1.7.1
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