From: Rafael J. Wysocki <rjw@xxxxxxx>
Currently pm_genpd_poweroff() discards error codes returned by
the PM domain's .power_off() callback, because it's safer to always
regard the domain as inaccessible to drivers after a failing
.power_off(). Still, there are situations in which the low-level
code may want to indicate that it doesn't want to power off the
domain, so allow it to do that by returning -EBUSY from .power_off().
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
---
drivers/base/power/domain.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
Index: linux-2.6/drivers/base/power/domain.c
===================================================================
--- linux-2.6.orig/drivers/base/power/domain.c
+++ linux-2.6/drivers/base/power/domain.c
@@ -312,8 +312,16 @@ static int pm_genpd_poweroff(struct gene
}
}
- if (genpd->power_off)
- genpd->power_off(genpd);
+ if (genpd->power_off) {
+ ret = genpd->power_off(genpd);
+ if (ret == -EBUSY) {
+ genpd_set_active(genpd);
+ if (parent)
+ genpd_release_lock(parent);
+
+ goto out;
+ }
+ }
genpd->status = GPD_STATE_POWER_OFF;
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