linux-kernel - [PATCH 4.7 063/143] pinctrl: meson: Drop pinctrl_unregister for devm

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Date:   Mon,  5 Sep 2016 18:43:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Wei Yongjun <weiyj.lk@...il.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Kevin Hilman <khilman@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.7 063/143] pinctrl: meson: Drop pinctrl_unregister for devm_ registered device

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

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

From: Wei Yongjun <weiyj.lk@...il.com>

commit 5b236d0fde21d88351420ef0b9a6cb7aeeea0c54 upstream.

It's not necessary to unregister pin controller device registered
with devm_pinctrl_register() and using pinctrl_unregister() leads
to a double free.

This is detected by Coccinelle semantic patch.

Fixes: e649f7ec8c5f ("pinctrl: meson: Use devm_pinctrl_register() for pinctrl registration")
Signed-off-by: Wei Yongjun <weiyj.lk@...il.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
Acked-by: Kevin Hilman <khilman@...libre.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/meson/pinctrl-meson.c |    8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

--- a/drivers/pinctrl/meson/pinctrl-meson.c
+++ b/drivers/pinctrl/meson/pinctrl-meson.c
@@ -727,13 +727,7 @@ static int meson_pinctrl_probe(struct pl
 		return PTR_ERR(pc->pcdev);
 	}
 
-	ret = meson_gpiolib_register(pc);
-	if (ret) {
-		pinctrl_unregister(pc->pcdev);
-		return ret;
-	}
-
-	return 0;
+	return meson_gpiolib_register(pc);
 }
 
 static struct platform_driver meson_pinctrl_driver = {