linux-kernel - [PATCH 1/2] pinctrl: select_state: don't call pinctrl_free

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Date:	Fri, 29 Mar 2013 10:03:26 +0100
From:	Richard Genoud <richard.genoud@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dia.com>
Cc:	linux-kernel@...r.kernel.org,
	Richard Genoud <richard.genoud@...il.com>
Subject: [PATCH 1/2] pinctrl: select_state: don't call pinctrl_free_setting on error

As Stephen Warren pointed out, pinctrl_free_setting() was called instead
of pinmux_disable_setting() on error.
In this error code, we want to call pinmux_disable_setting() where
pinmux_enable_setting() was called.
And when pinconf_apply_setting() was called, we can't do much to undo
the pin muxing (the closest thing I can think about for "unmuxing" a pin
is muxing it as GPIO input).

Signed-off-by: Richard Genoud <richard.genoud@...il.com>
---
This commit is on top of:
[PATCH 3/3] pinctrl: pinctrl_select_state: set the old_state back on error

 drivers/pinctrl/core.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 714cf74..ddd9a150 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -926,7 +926,15 @@ unapply_new_state:
 	list_for_each_entry(setting2, &state->settings, node) {
 		if (&setting2->node == &setting->node)
 			break;
-		pinctrl_free_setting(true, setting2);
+		/*
+		 * All we can do here is pinmux_disable_setting.
+		 * That means that some pins are muxed differently now
+		 * than they were before applying the setting (We can't
+		 * "unmux a pin"!), but it's not a big deal since the pins
+		 * are free to be muxed by another apply_setting.
+		 */
+		if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
+			pinmux_disable_setting(setting2);
 	}
 
 	if (old_state) {
-- 
1.7.2.5

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