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authorDaniel Lezcano <daniel.lezcano@linaro.org>2022-01-31 00:02:06 +0300
committerDaniel Lezcano <daniel.lezcano@linaro.org>2022-02-23 21:45:40 +0300
commitc404c64d64bc31bebe8a2015103671f7cd282731 (patch)
tree905535b2150200d7b5b2e361ea035caf6de52e87 /drivers/powercap
parent690de0b4013f6f35bc9fced12746b9f396c471ae (diff)
downloadlinux-c404c64d64bc31bebe8a2015103671f7cd282731.tar.xz
powercap/dtpm: Destroy hierarchy function
The hierarchy creation function exits but without a destroy hierarchy function. Due to that, the modules creating the hierarchy can not be unloaded properly because they don't have an exit callback. Provide the dtpm_destroy_hierarchy() function to remove the previously created hierarchy. The function relies on all the release mechanisms implemented by the underlying powercap framework. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Link: https://lore.kernel.org/r/20220130210210.549877-4-daniel.lezcano@linaro.org
Diffstat (limited to 'drivers/powercap')
-rw-r--r--drivers/powercap/dtpm.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/powercap/dtpm.c b/drivers/powercap/dtpm.c
index 7bddd25a6767..d9d74f981118 100644
--- a/drivers/powercap/dtpm.c
+++ b/drivers/powercap/dtpm.c
@@ -617,3 +617,46 @@ out_unlock:
return ret;
}
EXPORT_SYMBOL_GPL(dtpm_create_hierarchy);
+
+static void __dtpm_destroy_hierarchy(struct dtpm *dtpm)
+{
+ struct dtpm *child, *aux;
+
+ list_for_each_entry_safe(child, aux, &dtpm->children, sibling)
+ __dtpm_destroy_hierarchy(child);
+
+ /*
+ * At this point, we know all children were removed from the
+ * recursive call before
+ */
+ dtpm_unregister(dtpm);
+}
+
+void dtpm_destroy_hierarchy(void)
+{
+ int i;
+
+ mutex_lock(&dtpm_lock);
+
+ if (!pct)
+ goto out_unlock;
+
+ __dtpm_destroy_hierarchy(root);
+
+
+ for (i = 0; i < ARRAY_SIZE(dtpm_subsys); i++) {
+
+ if (!dtpm_subsys[i]->exit)
+ continue;
+
+ dtpm_subsys[i]->exit();
+ }
+
+ powercap_unregister_control_type(pct);
+
+ pct = NULL;
+
+out_unlock:
+ mutex_unlock(&dtpm_lock);
+}
+EXPORT_SYMBOL_GPL(dtpm_destroy_hierarchy);