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authorRafael J. Wysocki <rjw@sisk.pl>2011-07-12 00:40:03 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2011-07-12 00:40:03 +0200
commit56375fd420f851944960bd53dbb08d674f4d9406 (patch)
tree634fc52ba88aad057cbd2175d9a2b91d5dee4f01 /drivers/base
parent4ecd6e651dd25ebbf0cc53c68162c0ab08641725 (diff)
downloadlinux-56375fd420f851944960bd53dbb08d674f4d9406.tar.bz2
PM / Domains: Queue up power off work only if it is not pending
In theory it is possible that pm_genpd_poweroff() for two different subdomains of the same parent domain will attempt to queue up the execution of pm_genpd_poweroff() for the parent twice in a row. This would lead to unpleasant consequences, so prevent it from happening by checking if genpd->power_off_work is pending before attempting to queue it up. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/power/domain.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index b6e29ffbb70d..c3e4e2934e16 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -213,6 +213,19 @@ static bool genpd_abort_poweroff(struct generic_pm_domain *genpd)
}
/**
+ * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
+ * @genpd: PM domait to power off.
+ *
+ * Queue up the execution of pm_genpd_poweroff() unless it's already been done
+ * before.
+ */
+static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
+{
+ if (!work_pending(&genpd->power_off_work))
+ queue_work(pm_wq, &genpd->power_off_work);
+}
+
+/**
* pm_genpd_poweroff - Remove power from a given PM domain.
* @genpd: PM domain to power down.
*
@@ -304,7 +317,7 @@ static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
if (parent) {
genpd_sd_counter_dec(parent);
if (parent->sd_count == 0)
- queue_work(pm_wq, &parent->power_off_work);
+ genpd_queue_power_off_work(parent);
genpd_release_lock(parent);
}