Re: [PATCH]sunsu: Fix panic in case of nonexistent port at "console=ttySY" cmdline option

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From: Kirill Tkhai <tkhai@xxxxxxxxx>
Date: Sun, 24 Feb 2013 13:01:15 +0400

> If a machine has X (X < 4) sunsu ports and cmdline
> option "console=ttySY" is passed, where X < Y <= 4,
> than the following panic happens:
> 
> Unable to handle kernel NULL pointer dereference
> TPC: <sunsu_console_setup+0x78/0xe0>
> RPC: <sunsu_console_setup+0x74/0xe0>
> I7: <register_console+0x378/0x3e0>
> Call Trace:
>  [0000000000453a38] register_console+0x378/0x3e0
>  [0000000000576fa0] uart_add_one_port+0x2e0/0x340
>  [000000000057af40] su_probe+0x160/0x2e0
>  [00000000005b8a4c] platform_drv_probe+0xc/0x20
>  [00000000005b6c2c] driver_probe_device+0x12c/0x220
>  [00000000005b6da8] __driver_attach+0x88/0xa0
>  [00000000005b4df4] bus_for_each_dev+0x54/0xa0
>  [00000000005b5a54] bus_add_driver+0x154/0x260
>  [00000000005b7190] driver_register+0x50/0x180
>  [00000000006d250c] sunsu_init+0x18c/0x1e0
>  [00000000006c2668] do_one_initcall+0xe8/0x160
>  [00000000006c282c] kernel_init_freeable+0x12c/0x1e0
>  [0000000000603764] kernel_init+0x4/0x100
>  [0000000000405f64] ret_from_syscall+0x1c/0x2c
>  [0000000000000000]           (null)
> 
> 1)Fix the panic;
> 2)Increment registered port number every successful
> probe.
> 
> Signed-off-by: Kirill Tkhai <tkhai@xxxxxxxxx>

Applied and queued up for -stable, thanks.
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