linux-kernel - [PATCH 4.19 72/89] pinctrl: core: Remove extra kref

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Message-Id: <20200317103308.238331165@linuxfoundation.org>
Date:   Tue, 17 Mar 2020 11:55:21 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.19 72/89] pinctrl: core: Remove extra kref_get which blocks hogs being freed

From: Charles Keepax <ckeepax@...nsource.cirrus.com>

commit aafd56fc79041bf36f97712d4b35208cbe07db90 upstream.

kref_init starts with the reference count at 1, which will be balanced
by the pinctrl_put in pinctrl_unregister. The additional kref_get in
pinctrl_claim_hogs will increase this count to 2 and cause the hogs to
not get freed when pinctrl_unregister is called.

Fixes: 6118714275f0 ("pinctrl: core: Fix pinctrl_register_and_init() with pinctrl_enable()")
Signed-off-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Link: https://lore.kernel.org/r/20200228154142.13860-1-ckeepax@opensource.cirrus.com
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/core.c |    1 -
 1 file changed, 1 deletion(-)

--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -2008,7 +2008,6 @@ static int pinctrl_claim_hogs(struct pin
 		return PTR_ERR(pctldev->p);
 	}
 
-	kref_get(&pctldev->p->users);
 	pctldev->hog_default =
 		pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
 	if (IS_ERR(pctldev->hog_default)) {