Re: [PATCH] fix oops in usbserial_cleanup function;

[Greg KH <greg@kroah.com>]

On Fri, Oct 15, 2010 at 12:14:37PM +0800, m00150988@huawei.com wrote:
> From: marui <m00150988@huawei.com>
> 
> 1. I find this bug on OpenSUSE 11.3 which kernel vesion is 2.6.34, but the latest kernel vesion 2.6.36-rc7 aslo have this bug. This patch is based on the kernel of 2.6.36-rc7.
> 2. Bug report:
>    a. Install huawei datacard dashboard on OpenSUSE 11.3
>    b. Plug in huawei datacard into OpenSUSE 11.3 which kernel verison is 2.6.36-rc7
>    c. After the dashboard has detected the device, I  pull out the usb datacard
>    d. close datashboard,then kernel panic will happen in usbserial_cleanup function. 
>  
>  
> 3. fix the bug:
>    I find usbserial_cleanup should judge the usb device wheher has been disconnected firtly.
> 
> Signed-off-by: marui<m00150988@huawei.com>

I need a full name here please.

> --- linux-2.6.36-rc7_orig/drivers/usb/serial/usb-serial.c	2010-10-06 16:39:52.000000000 -0400
> +++ linux-2.6.36-rc7/drivers/usb/serial/usb-serial.c	2010-10-14 20:59:47.000000000 -0400
> @@ -328,6 +328,20 @@ static void serial_cleanup(struct tty_st
>  	/* The console is magical.  Do not hang up the console hardware
>  	 * or there will be tears.
>  	 */
> +        dbg("%s start\n",__func__);
> +        if(NULL == port)
> +        {
> +            dbg("%s NULL == port\n",__func__);
> +            return;
> +        }
> +	mutex_lock(&port->serial->disc_mutex);

Please read Documentation/CodingStyle for the tabs and brace placements
you need to resolve.

thanks,

greg k-h