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PM: PM QOS update fix

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This update handles a use case where pm_qos update requests need to
silently fail if the update is being sent to a handle that is NULL.

The problem was that the original pm_qos silently fails when a request
update is passed to a parameter that has not been added to the list yet.
This update restores that behavior.

Signed-off-by: markgross <markgross@thegnar.org>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Mark Gross 2010-05-17 00:21:03 +02:00 • committed by Rafael J. Wysocki
parent 8f77578cc2
commit 25f3a5a285
1 changed files with 13 additions and 11 deletions
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24
kernel/pm_qos_params.c
View file

@ -252,19 +252,21 @@ void pm_qos_update_request(struct pm_qos_request_list *pm_qos_req,
int pending_update = 0; int pending_update = 0;
s32 temp; s32 temp;
spin_lock_irqsave(&pm_qos_lock, flags); if (pm_qos_req) { /*guard against callers passing in null */
if (new_value == PM_QOS_DEFAULT_VALUE) spin_lock_irqsave(&pm_qos_lock, flags);
temp = pm_qos_array[pm_qos_req->pm_qos_class]->default_value; if (new_value == PM_QOS_DEFAULT_VALUE)
else temp = pm_qos_array[pm_qos_req->pm_qos_class]->default_value;
temp = new_value; else
temp = new_value;
if (temp != pm_qos_req->value) { if (temp != pm_qos_req->value) {
pending_update = 1; pending_update = 1;
pm_qos_req->value = temp; pm_qos_req->value = temp;
}
spin_unlock_irqrestore(&pm_qos_lock, flags);
if (pending_update)
update_target(pm_qos_req->pm_qos_class);
} }
spin_unlock_irqrestore(&pm_qos_lock, flags);
if (pending_update)
update_target(pm_qos_req->pm_qos_class);
} }
EXPORT_SYMBOL_GPL(pm_qos_update_request); EXPORT_SYMBOL_GPL(pm_qos_update_request);