linux-kernel - [PATCH] regulator: core: Handle probe deferral from DT when resolving supplies

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Message-Id: <1443641452-21824-1-git-send-email-broonie@kernel.org>
Date:	Wed, 30 Sep 2015 20:30:52 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Sascha Hauer <s.hauer@...gutronix.de>,
	Liam Girdwood <lgirdwood@...il.com>
Cc:	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH] regulator: core: Handle probe deferral from DT when resolving supplies

When resolving regulator-regulator supplies we ignore probe deferral
returns from regulator_dev_lookup() (such as are generated for DT when
we can see a supply is registered) and just fall back to the dummy
regulator if there are full constraints (as is the case for DT).  This
means that probe deferral is broken for DT systems, fix that by paying
attention to -EPROBE_DEFER return codes like we do -ENODEV.

A further patch will simplify this further, this is a minimal fix for
the specific issue.

Reported-by: Sascha Hauer <s.hauer@...gutronix.de>
Signed-off-by: Mark Brown <broonie@...nel.org>
---

Tested with my famous "I need to leave the house right now so haven't
even tried building this yet" test plan - please let me know how this
works for you.

 drivers/regulator/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index af045e5..e9b94d7 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1448,6 +1448,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
 			return 0;
 		}

+		/* Did the lookup explicitly defer for us? */
+		if (ret == -EPROBE_DEFER)
+			return ret;
+
 		if (have_full_constraints()) {
 			r = dummy_regulator_rdev;
 			get_device(&r->dev);
-- 
2.5.0

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