linux-kernel - Re: [PATCH] VSOCK: Fix misc device registration

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Date:	Thu, 25 Apr 2013 04:22:28 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	asias@...hat.com
Cc:	netdev@...r.kernel.org, acking@...are.com, dtor@...are.com,
	grantr@...are.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] VSOCK: Fix misc device registration

From: Asias He <asias@...hat.com>
Date: Wed, 24 Apr 2013 14:33:52 +0800

> When we call vsock_core_init to init VSOCK the second time,
> vsock_device.minor still points to the old dynamically allocated minor
> number. misc_register will allocate it for us successfully as if we were
> asking for a static one. However, when other user call misc_register to
> allocate a dynamic minor number, it will give the one used by
> vsock_core_init(), causing this:
> 
>   [  405.470687] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xcc/0xf0()
>   [  405.470689] Hardware name: OptiPlex 790
>   [  405.470690] sysfs: cannot create duplicate filename '/dev/char/10:54'
> 
> Always set vsock_device.minor to MISC_DYNAMIC_MINOR before we
> register.
> 
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Andy King <acking@...are.com>
> Cc: Dmitry Torokhov <dtor@...are.com>
> Cc: Reilly Grant <grantr@...are.com>
> Cc: netdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Asias He <asias@...hat.com>

Applied.
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