Subject: [PATCH v2 1/4] PM / Domains: Allow no domain-idle-states DT property in genpd when parsing

From: Ulf Hansson <[email-masked]>
Date: Tue, 3 Mar 2020 21:35:56 +0100

Commit 2c361684803e ("PM / Domains: Don't treat zero found compatible idle
states as an error"), moved of_genpd_parse_idle_states() towards allowing
none compatible idle state to be found for the device node, rather than
returning an error code.

However, it didn't consider that the "domain-idle-states" DT property may
be missing as it's optional, which makes of_count_phandle_with_args() to
return -ENOENT. Let's fix this to make the behaviour consistent.

Reported-by: Benjamin Gaignard <[email-masked]>
Fixes: 2c361684803e ("PM / Domains: Don't treat zero found compatible idle states as an error")
Cc: <[email-masked]>
Signed-off-by: Ulf Hansson <[email-masked]>
---
 drivers/base/power/domain.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 959d6d5eb000..0a01df608849 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2653,7 +2653,7 @@ static int genpd_iterate_idle_states(struct device_node *dn,
 
 	ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
 	if (ret <= 0)
-		return ret;
+		return ret == -ENOENT ? 0 : ret;
 
 	/* Loop over the phandles until all the requested entry is found */
 	of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
-- 
2.20.1

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