linux-kernel - Re: List corruption in hidraw

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Message-ID: <alpine.LNX.2.00.1308070258480.10817@pobox.suse.cz>
Date:	Wed, 7 Aug 2013 03:01:26 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Peter Wu <lekensteyn@...il.com>
Cc:	linux-input@...r.kernel.org,
	Manoj Chourasia <mchourasia@...dia.com>,
	linux-kernel@...r.kernel.org, alnovak@...e.cz
Subject: Re: List corruption in hidraw_release in 3.11-rc4

On Tue, 6 Aug 2013, Peter Wu wrote:

> While debugging upowerd (with Logitech Unifying receiver via hidraw),
> I came across this list corruption warning.

Peter,

does the patch below fix the problem you are seeing?

---
 drivers/hid/hidraw.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index a745163..6f1feb2 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -518,7 +518,6 @@ int hidraw_connect(struct hid_device *hid)
 		goto out;
 	}
 
-	mutex_unlock(&minors_lock);
 	init_waitqueue_head(&dev->wait);
 	INIT_LIST_HEAD(&dev->list);
 
@@ -528,6 +527,7 @@ int hidraw_connect(struct hid_device *hid)
 	dev->exist = 1;
 	hid->hidraw = dev;
 
+	mutex_unlock(&minors_lock);
 out:
 	return result;
 
-- 
Jiri Kosina
SUSE Labs
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