Merge tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl

Pull pinctrl fixes from Linus Walleij:
 "First round of pin control fixes for v3.14:

   - Protect pinctrl_list_add() with the proper mutex.  This was
     identified by RedHat.  Caused nasty locking warnings was rootcased
     by Stanislaw Gruszka.

   - Avoid adding dangerous debugfs files when either half of the
     subsystem is unused: pinmux or pinconf.

   - Various fixes to various drivers: locking, hardware particulars, DT
     parsing, error codes"

* tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl:
  pinctrl: tegra: return correct error type
  pinctrl: do not init debugfs entries for unimplemented functionalities
  pinctrl: protect pinctrl_list add
  pinctrl: sirf: correct the pin index of ac97_pins group
  pinctrl: imx27: fix offset calculation in imx_read_2bit
  pinctrl: vt8500: Change devicetree data parsing
  pinctrl: imx27: fix wrong offset to ICONFB
  pinctrl: at91: use locked variant of irq_set_handler

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 5ee61a470016..c0fe6091566a 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -851,7 +851,9 @@ static struct pinctrl *create_pinctrl(struct device *dev)
         kref_init(&p->users);
 
         /* Add the pinctrl handle to the global list */
+        mutex_lock(&pinctrl_list_mutex);
         list_add_tail(&p->node, &pinctrl_list);
+        mutex_unlock(&pinctrl_list_mutex);
 
         return p;
 }
@@ -1642,8 +1644,10 @@ 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)