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From: Robert Baldyga <r.baldyga@samsung.com>
To: cw00.choi@samsung.com
Cc: myungjoo.ham@samsung.com, rogerq@ti.com,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	m.szyprowski@samsung.com, Robert Baldyga <r.baldyga@samsung.com>
Subject: [PATCH 1/4] extcon: usb-gpio: register extcon device before IRQ registration
Date: Tue, 31 Mar 2015 09:46:00 +0200	[thread overview]
Message-ID: <1427787963-23562-2-git-send-email-r.baldyga@samsung.com> (raw)
In-Reply-To: <1427787963-23562-1-git-send-email-r.baldyga@samsung.com>

IRQ handler touches info->edev, so if interrupt occurs before extcon
device initialization it can cause NULL pointer dereference. Doing extcon
initialization before IRQ handler registration fixes this problem.

Signed-off-by: Robert Baldyga <r.baldyga@samsung.com>
---
 drivers/extcon/extcon-usb-gpio.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
index 3f0bad3..f6aa99d 100644
--- a/drivers/extcon/extcon-usb-gpio.c
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -119,6 +119,18 @@ static int usb_extcon_probe(struct platform_device *pdev)
 		return PTR_ERR(info->id_gpiod);
 	}
 
+	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
+	if (IS_ERR(info->edev)) {
+		dev_err(dev, "failed to allocate extcon device\n");
+		return -ENOMEM;
+	}
+
+	ret = devm_extcon_dev_register(dev, info->edev);
+	if (ret < 0) {
+		dev_err(dev, "failed to register extcon device\n");
+		return ret;
+	}
+
 	ret = gpiod_set_debounce(info->id_gpiod,
 				 USB_GPIO_DEBOUNCE_MS * 1000);
 	if (ret < 0)
@@ -142,18 +154,6 @@ static int usb_extcon_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);
-	if (IS_ERR(info->edev)) {
-		dev_err(dev, "failed to allocate extcon device\n");
-		return -ENOMEM;
-	}
-
-	ret = devm_extcon_dev_register(dev, info->edev);
-	if (ret < 0) {
-		dev_err(dev, "failed to register extcon device\n");
-		return ret;
-	}
-
 	platform_set_drvdata(pdev, info);
 	device_init_wakeup(dev, 1);
 
-- 
1.9.1


  reply	other threads:[~2015-03-31  7:46 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-31  7:45 [PATCH 0/4] extcon: usb-gpio: fixes and improvements Robert Baldyga
2015-03-31  7:46 ` Robert Baldyga [this message]
2015-03-31  8:37   ` [PATCH 1/4] extcon: usb-gpio: register extcon device before IRQ registration Roger Quadros
2015-03-31  7:46 ` [PATCH 2/4] extcon: usb-gpio: add support for VBUS detection Robert Baldyga
2015-03-31  9:22   ` Roger Quadros
2015-03-31  7:46 ` [PATCH 3/4] extcon: usb-gpio: make debounce value configurable in devicetree Robert Baldyga
2015-03-31  9:30   ` Roger Quadros
2015-03-31 12:16     ` Robert Baldyga
2015-03-31  7:46 ` [PATCH 4/4] Documentation: extcon: usb-gpio: update usb-gpio binding description Robert Baldyga
2015-03-31 10:20   ` Roger Quadros
2015-03-31 12:04     ` Robert Baldyga

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