[3.5.y.z extended stable] Patch "pinctrl: do not init debugfs entries for unimplemented" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    pinctrl: do not init debugfs entries for unimplemented

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From cf12d30e83d8ccd4c3ce741162c102b26f5c7dc4 Mon Sep 17 00:00:00 2001
From: Florian Vaussard <florian.vaussard at epfl.ch>
Date: Wed, 5 Feb 2014 07:51:22 +0100
Subject: pinctrl: do not init debugfs entries for unimplemented
 functionalities

commit e7f2a444891cb39f11d5429467d0fd7e011fe7fe upstream.

Commit c420619 "pinctrl: pinconf: remove checks on ops->pin_config_get"
removed the check on (ops != NULL) when performing pinconf_pins_show() or
pinconf_groups_show(). As these entries are always enabled, even if
pinconf is not supported, reading will result in an oops due to NULL
ops.

Instead of checking for ops, remove the corresponding debugfs entries if
pinconf and/or pinmux are not implemented.

Tested on OMAP3 (pinctrl-single).

Signed-off-by: Florian Vaussard <florian.vaussard at epfl.ch>
Signed-off-by: Linus Walleij <linus.walleij at linaro.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/pinctrl/core.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 5e59c45..c172754 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1327,8 +1327,10 @@ static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
 			    device_root, pctldev, &pinctrl_groups_ops);
 	debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
 			    device_root, pctldev, &pinctrl_gpioranges_ops);
-	pinmux_init_device_debugfs(device_root, pctldev);
-	pinconf_init_device_debugfs(device_root, pctldev);
+	if (pctldev->desc->pmxops)
+		pinmux_init_device_debugfs(device_root, pctldev);
+	if (pctldev->desc->confops)
+		pinconf_init_device_debugfs(device_root, pctldev);
 }

 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
--
1.8.3.2