tree ba04c23e0d5a831705f0f9bfe1a9be10aff99a78
parent 6c847402e1c69c1cfe2bddeadc8391bacbb3d0a5
author Ben Dooks <ben@fluff.org> 1204672146 -0800
committer Greg Kroah-Hartman <gregkh@suse.de> 1208657424 -0700

sysdev: detect multiple driver registrations

I've just found how easy it is to accidentally register a sysdev_driver for
two different classes.  When this happens, bad things happen as the
sysdev_driver structure keeps has the list entry for the driver
registration.

The following patch makes a WARN_ON() if this happens, although I think
BUG_ON or returning -EAGAIN could also be valid responses to this.

Signed-off-by: Ben Dooks <ben@fluff.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>