linux-kernel - [patch 2.6.30-rc3] regulator: regression fix

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Date:	Mon, 27 Apr 2009 19:59:40 -0700
From:	David Brownell <david-b@...bell.net>
To:	Mark Brown <broonie@...ena.org.uk>,
	Liam Girdwood <lrg@...mlogic.co.uk>,
	lkml <linux-kernel@...r.kernel.org>
Subject: [patch 2.6.30-rc3] regulator: regression fix

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>

Revert the "Don't warn on omitted voltage constraints" patch
(3e2b9abda554e9f6105996dca77cca9ef98de17a), which doesn't do
quite what its comments said it was doing.

By removing the "else", it breaks the handling of fixed-voltage
regulators ... turning a non-error/non-warning situation into
a complete init failure, which can then prevent system startup.

Signed-off-by: David Brownell <dbrownell@...rs.sourceforge.net>
---
You might want to provide a different patch, but ignoring
this regression doesn't seem practical...

 drivers/regulator/core.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -709,12 +709,8 @@ static int set_machine_constraints(struc
 			cmax = INT_MAX;
 		}
 
-		/* voltage constraints are optional */
-		if ((cmin == 0) && (cmax == 0))
-			goto out;
-
 		/* else require explicit machine-level constraints */
-		if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
+		else if (cmin <= 0 || cmax <= 0 || cmax < cmin) {
 			pr_err("%s: %s '%s' voltage constraints\n",
 				       __func__, "invalid", name);
 			ret = -EINVAL;
--
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