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PM / Domains: Make pm_genpd_poweron() always survive parent removal

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If pm_genpd_remove_subdomain() is called to remove a PM domain's
subdomain and pm_genpd_poweron() is called for that subdomain at
the same time, and the pm_genpd_poweron() called by it recursively
for the parent returns an error, the first pm_genpd_poweron()'s
error code path will attempt to decrement the subdomain counter of
a PM domain that it's not a subdomain of any more.

Rearrange the code in pm_genpd_poweron() to prevent this from
happening.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
This commit is contained in:
Rafael J. Wysocki 2011-08-08 23:43:22 +02:00
parent 3c07cbc488
commit 9e08cf4296
1 changed files with 20 additions and 13 deletions
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33
drivers/base/power/domain.c
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@ -89,12 +89,14 @@ static void genpd_set_active(struct generic_pm_domain *genpd)
*/
int pm_genpd_poweron(struct generic_pm_domain *genpd)
{
struct generic_pm_domain *parent = genpd->parent;
struct generic_pm_domain *parent;
int ret = 0;
start:
mutex_lock(&genpd->lock);
parent = genpd->parent;
start:
if (genpd->status == GPD_STATE_ACTIVE
|| (genpd->prepared_count > 0 && genpd->suspend_power_off))
goto out;
@ -110,29 +112,34 @@ int pm_genpd_poweron(struct generic_pm_domain *genpd)
mutex_unlock(&genpd->lock);
ret = pm_genpd_poweron(parent);
if (ret) {
genpd_sd_counter_dec(parent);
return ret;
}
mutex_lock(&genpd->lock);
if (ret)
goto err;
parent = NULL;
goto start;
}
if (genpd->power_on)
if (genpd->power_on) {
ret = genpd->power_on(genpd);
if (ret) {
if (genpd->parent)
genpd_sd_counter_dec(genpd->parent);
} else {
genpd_set_active(genpd);
if (ret)
goto err;
}
genpd_set_active(genpd);
out:
mutex_unlock(&genpd->lock);
return ret;
err:
if (genpd->parent)
genpd_sd_counter_dec(genpd->parent);
goto out;
}
#endif /* CONFIG_PM */