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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Kevin Hilman <khilman@baylibre.com>,
        Sean Wang <sean.wang@mediatek.com>,
        Linus Walleij <linus.walleij@linaro.org>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.18 162/235] pinctrl: mt7622: Fix probe fail by misuse the selector
Date:   Mon, 24 Sep 2018 13:52:28 +0200
Message-Id: <20180924113121.314356351@linuxfoundation.org>
In-Reply-To: <20180924113103.999624566@linuxfoundation.org>
References: <20180924113103.999624566@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Sean Wang <sean.wang@mediatek.com>

[ Upstream commit 238262af08a20e5f1932fcf606b8b84370ac8b77 ]

After the commit acf137951367 ("pinctrl: core: Return selector to the
pinctrl driver") and the commit 47f1242d19c3 ("pinctrl: pinmux: Return
selector to the pinctrl driver"), it's necessary to add the fixes
needed for the pin controller drivers to use the appropriate returned
selector for a negative error number returned in case of the fail at
these functions. Otherwise, the driver would have a failed probe and
that causes boot message cannot correctly output and devices fail
to acquire their own pins.

Cc: Kevin Hilman <khilman@baylibre.com>
Fixes: acf137951367 ("pinctrl: core: Return selector to the pinctrl driver")
Fixes: 47f1242d19c3 ("pinctrl: pinmux: Return selector to the pinctrl driver")
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/pinctrl/mediatek/pinctrl-mt7622.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/pinctrl/mediatek/pinctrl-mt7622.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mt7622.c
@@ -1537,7 +1537,7 @@ static int mtk_build_groups(struct mtk_p
 		err = pinctrl_generic_add_group(hw->pctrl, group->name,
 						group->pins, group->num_pins,
 						group->data);
-		if (err) {
+		if (err < 0) {
 			dev_err(hw->dev, "Failed to register group %s\n",
 				group->name);
 			return err;
@@ -1558,7 +1558,7 @@ static int mtk_build_functions(struct mt
 						  func->group_names,
 						  func->num_group_names,
 						  func->data);
-		if (err) {
+		if (err < 0) {
 			dev_err(hw->dev, "Failed to register function %s\n",
 				func->name);
 			return err;