linux-kernel - Applied "regulator: core: Handle probe deferral from DT when resolving supplies" to the regulator tree

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Date:	Thu, 01 Oct 2015 11:02:11 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Sascha Hauer <s.hauer@...gutronix.de>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Mark Brown <broonnie@...nel.org>, stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: Applied "regulator: core: Handle probe deferral from DT when resolving supplies" to the regulator tree

The patch

   regulator: core: Handle probe deferral from DT when resolving supplies

has been applied to the regulator tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 40602072110578513358d3efa09c1e3eb490d436 Mon Sep 17 00:00:00 2001
From: Mark Brown <broonie@...nel.org>
Date: Thu, 1 Oct 2015 10:59:48 +0100
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.

Fixes: 9f7e25edb1575a6d2 (regulator: core: Handle full constraints systems when resolving supplies)
Reported-by: Sascha Hauer <s.hauer@...gutronix.de>
Tested-by: Sascha Hauer <s.hauer@...gutronix.de>
Signed-off-by: Mark Brown <broonnie@...nel.org>
Cc: stable@...r.kernel.org
---
 drivers/regulator/core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 7a85ac9..bd067ec 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1403,6 +1403,10 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
 	}

 	if (!r) {
+		/* Did the lookup explicitly defer for us? */
+		if (ret == -EPROBE_DEFER)
+			return ret;
+
 		if (have_full_constraints()) {
 			r = dummy_regulator_rdev;
 		} else {
-- 
2.5.0

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