linux-kernel - [PATCH] extcon: intel-int3496: Fix oops on probe

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Message-Id: <20180211232633.13565-1-hdegoede@redhat.com>
Date:   Mon, 12 Feb 2018 00:26:33 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Hans de Goede <hdegoede@...hat.com>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH] extcon: intel-int3496: Fix oops on probe

Commit 41d600274fbf ("extcon: int3496: process id-pin first so that we
start with the right status") starts the work on the workqueue before
registration to make sure we've a valid cable state directly after
registration.

But that commit moves the queuing of the work to before we even alloc the
extcon, causing a NULL pointer deref in the worker.

This commit moves the queuing of the work to after we alloc the extcon,
fixing the NULL pointer deref.

Fixes: 41d600274fbf ("extcon: int3496: process id-pin first ...")
Cc: stable@...r.kernel.org
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/extcon/extcon-intel-int3496.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/extcon/extcon-intel-int3496.c b/drivers/extcon/extcon-intel-int3496.c
index b23ee9d993a3..673bb26a9a2a 100644
--- a/drivers/extcon/extcon-intel-int3496.c
+++ b/drivers/extcon/extcon-intel-int3496.c
@@ -131,15 +131,15 @@ static int int3496_probe(struct platform_device *pdev)
 	if (IS_ERR(data->gpio_usb_mux))
 		dev_info(dev, "can't request USB MUX GPIO\n");
 
+	data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
+	if (IS_ERR(data->edev))
+		return -ENOMEM;
+
 	/* process id-pin first so that we start with the right status */
 	queue_delayed_work(system_wq, &data->work, 0);
 	flush_delayed_work(&data->work);
 
 	/* register extcon device */
-	data->edev = devm_extcon_dev_allocate(dev, int3496_cable);
-	if (IS_ERR(data->edev))
-		return -ENOMEM;
-
 	ret = devm_extcon_dev_register(dev, data->edev);
 	if (ret < 0) {
 		dev_err(dev, "can't register extcon device: %d\n", ret);
-- 
2.14.3