Re: [PATCH] netiucv: Hold rtnl between name allocation and deviceregistration.

From: David Miller
Date: Thu Jun 13 2013 - 20:42:03 EST

From: Benjamin Poirier <bpoirier@xxxxxxx>
Date: Thu, 13 Jun 2013 09:09:47 -0400

> fixes a race condition between concurrent initializations of netiucv devices
> that try to use the same name.
> sysfs: cannot create duplicate filename '/devices/iucv/netiucv2'
> [...]
> Call Trace:
> ([<00000000002edea4>] sysfs_add_one+0xb0/0xdc)
> [<00000000002eecd4>] create_dir+0x80/0xfc
> [<00000000002eee38>] sysfs_create_dir+0xe8/0x118
> [<00000000003835a8>] kobject_add_internal+0x120/0x2d0
> [<00000000003839d6>] kobject_add+0x62/0x9c
> [<00000000003d9564>] device_add+0xcc/0x510
> [<000003e00212c7b4>] netiucv_register_device+0xc0/0x1ec [netiucv]
> Signed-off-by: Benjamin Poirier <bpoirier@xxxxxxx>
> Tested-by: Ursula Braun <braunu@xxxxxxxxxx>

Yes as dev_alloc_name() must be invoked under RTNL or dev_base_lock, this
fix is correct.

Applied, thanks.
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