Re: [PATCH] VSOCK: Fix misc device registration

From: David Miller
Date: Thu Apr 25 2013 - 04:22:39 EST

From: Asias He <asias@xxxxxxxxxx>
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@xxxxxxxxxxxxx>
> Cc: Andy King <acking@xxxxxxxxxx>
> Cc: Dmitry Torokhov <dtor@xxxxxxxxxx>
> Cc: Reilly Grant <grantr@xxxxxxxxxx>
> Cc: netdev@xxxxxxxxxxxxxxx
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> Signed-off-by: Asias He <asias@xxxxxxxxxx>

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