From: Andrew Vagin <avagin@openvz.org>
Date: Wed, 7 Mar 2012 10:49:56 +0000 (+0400)
Subject: uevent: send events in correct order according to seqnum (v3)
X-Git-Tag: v3.4-rc1~187^2~7
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7b60a18da393ed70db043a777fd9e6d5363077c4;p=pandora-kernel.git

uevent: send events in correct order according to seqnum (v3)

The queue handling in the udev daemon assumes that the events are
ordered.

Before this patch uevent_seqnum is incremented under sequence_lock,
than an event is send uner uevent_sock_mutex. I want to say that code
contained a window between incrementing seqnum and sending an event.

This patch locks uevent_sock_mutex before incrementing uevent_seqnum.

v2: delete sequence_lock, uevent_seqnum is protected by uevent_sock_mutex
v3: unlock the mutex before the goto exit

Thanks for Kay for the comments.

Signed-off-by: Andrew Vagin <avagin@openvz.org>
Tested-By: Kay Sievers <kay.sievers@vrfy.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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