linux-kernel - [PATCH v2] driver: base: pinctrl: return error from, pinctrl_bind

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Date:   Wed, 14 Sep 2016 12:04:18 +0530
From:   Deepak Das <deepak_das@...tor.com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     vzapolsk <Vladimir_Zapolskiy@...tor.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] driver: base: pinctrl: return error from,
 pinctrl_bind_pins()

strict pin controller returns -EINVAL in case of pin request which
is already claimed by somebody else.
Following is the sequence of calling pin_request() from
pinctrl_bind_pins():-
pinctrl_bind_pins()->pinctrl_select_state()->pinmux_enable_setting()->
pin_request()

But pinctrl_bind_pins() only returns -EPROBE_DEFER which makes device
driver probe successful even if the pin request is rejected by the pin
controller subsystem.

This commit modifies pinctrl_bind_pins() to return error if the pin is
rejected by pin control subsystem.

Signed-off-by: Deepak Das <deepak_das@...tor.com>
---
Changes from v1 to v2:
* Modified the comment to indicate return error in case of
   invalid pin requests

  drivers/base/pinctrl.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/base/pinctrl.c b/drivers/base/pinctrl.c
index 5fb74b4..12f0eb5 100644
--- a/drivers/base/pinctrl.c
+++ b/drivers/base/pinctrl.c
@@ -80,8 +80,8 @@ cleanup_alloc:
         devm_kfree(dev, dev->pins);
         dev->pins = NULL;

-       /* Only return deferrals */
-       if (ret != -EPROBE_DEFER)
+       /* Return deferrals & invalid pin requests */
+       if ((ret != -EPROBE_DEFER) && (ret != -EINVAL))
                 ret = 0;

         return ret;
--
1.9.1