linux-kernel - [PATCH v2 04/13] extcon: ptn5150: Fix usage of atomic GPIO with sleeping GPIO chips

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Message-Id: <20200817070009.4631-5-krzk@kernel.org>
Date:   Mon, 17 Aug 2020 09:00:00 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Vijai Kumar K <vijaikumar.kanagarajan@...il.com>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Cc:     stable@...r.kernel.org
Subject: [PATCH v2 04/13] extcon: ptn5150: Fix usage of atomic GPIO with sleeping GPIO chips

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@...r.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
---
 drivers/extcon/extcon-ptn5150.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-ptn5150.c b/drivers/extcon/extcon-ptn5150.c
index d1c997599390..5f5252752644 100644
--- a/drivers/extcon/extcon-ptn5150.c
+++ b/drivers/extcon/extcon-ptn5150.c
@@ -127,7 +127,7 @@ static void ptn5150_irq_work(struct 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_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_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);
 		}
 	}
 
-- 
2.17.1