linux-kernel - [PATCH 3.11 032/121] pinctrl: do not init debugfs entries for unimplemented functionalities

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Message-Id: <1392986945-9693-33-git-send-email-luis.henriques@canonical.com>
Date:	Fri, 21 Feb 2014 12:47:36 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Florian Vaussard <florian.vaussard@...l.ch>,
	Linus Walleij <linus.walleij@...aro.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 032/121] pinctrl: do not init debugfs entries for unimplemented functionalities

3.11.10.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Vaussard <florian.vaussard@...l.ch>

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@...l.ch>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.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 dbcf284..dec5787 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -1621,8 +1621,10 @@ 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)
-- 
1.9.0

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