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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, Krzysztof Kozlowski <krzk@kernel.org>,
        Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>,
        Chanwoo Choi <cw00.choi@samsung.com>
Subject: [PATCH 5.9 198/391] extcon: ptn5150: Fix usage of atomic GPIO with sleeping GPIO chips
Date:   Tue,  3 Nov 2020 21:34:09 +0100
Message-Id: <20201103203400.254355642@linuxfoundation.org>
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From: Krzysztof Kozlowski <krzk@kernel.org>

commit 6aaad58c872db062f7ea2761421ca748bd0931cc upstream.

The driver uses atomic version of gpiod_set_value() without any real
reason.  It is called in a workqueue under mutex so it could sleep
there.  Changing it to "can_sleep" flavor allows to use the driver with
all GPIO chips.

Fixes: 4ed754de2d66 ("extcon: Add support for ptn5150 extcon driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Vijai Kumar K <vijaikumar.kanagarajan@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/extcon/extcon-ptn5150.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/extcon/extcon-ptn5150.c
+++ b/drivers/extcon/extcon-ptn5150.c
@@ -127,7 +127,7 @@ static void ptn5150_irq_work(struct work
 			case PTN5150_DFP_ATTACHED:
 				extcon_set_state_sync(info->edev,
 						EXTCON_USB_HOST, false);
-				gpiod_set_value(info->vbus_gpiod, 0);
+				gpiod_set_value_cansleep(info->vbus_gpiod, 0);
 				extcon_set_state_sync(info->edev, EXTCON_USB,
 						true);
 				break;
@@ -138,9 +138,9 @@ static void ptn5150_irq_work(struct work
 					PTN5150_REG_CC_VBUS_DETECTION_MASK) >>
 					PTN5150_REG_CC_VBUS_DETECTION_SHIFT);
 				if (vbus)
-					gpiod_set_value(info->vbus_gpiod, 0);
+					gpiod_set_value_cansleep(info->vbus_gpiod, 0);
 				else
-					gpiod_set_value(info->vbus_gpiod, 1);
+					gpiod_set_value_cansleep(info->vbus_gpiod, 1);
 
 				extcon_set_state_sync(info->edev,
 						EXTCON_USB_HOST, true);
@@ -156,7 +156,7 @@ static void ptn5150_irq_work(struct work
 					EXTCON_USB_HOST, false);
 			extcon_set_state_sync(info->edev,
 					EXTCON_USB, false);
-			gpiod_set_value(info->vbus_gpiod, 0);
+			gpiod_set_value_cansleep(info->vbus_gpiod, 0);
 		}
 	}