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PM / Domains: Add device domain data reference counter

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Add a mechanism for counting references to the
struct generic_pm_domain_data object pointed to by
dev->power.subsys_data->domain_data if the device in question
belongs to a generic PM domain.

This change is necessary for a subsequent patch making it possible to
allocate that object from within pm_genpd_add_callbacks(), so that
drivers can attach their PM domain device callbacks to devices before
those devices are added to PM domains.

This patch has been tested on the SH7372 Mackerel board.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki
2012-07-05 22:12:32 +02:00
parent cbc9ef0287
commit 1d5fcfec22
2 changed files with 58 additions and 26 deletions
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include/linux/pm_domain.h
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@@ -112,6 +112,7 @@ struct generic_pm_domain_data {
struct gpd_timing_data td;
struct notifier_block nb;
struct mutex lock;
unsigned int refcount;
bool need_restore;
bool always_on;
};