linux-kernel - Re: [PATCH] tty/n_gsm.c: do not clear gsm

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Date:	Thu, 09 Oct 2014 15:23:49 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	"xinhui.pan" <xinhuix.pan@...el.com>, Jiri Slaby <jslaby@...e.cz>,
	linux-kernel@...r.kernel.org,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>,
	mnipxh <mnipxh@...il.com>, gnomes@...rguk.ukuu.org.uk
Subject: Re: [PATCH] tty/n_gsm.c: do not clear gsm_mux entry when the gsm
 is not closed

On 10/09/2014 03:13 PM, Greg Kroah-Hartman wrote:
> On Thu, Oct 09, 2014 at 03:01:46PM -0400, Peter Hurley wrote:
>> On 07/28/2014 11:13 AM, Greg Kroah-Hartman wrote:
>>> On Mon, Jul 28, 2014 at 03:16:25PM +0800, xinhui.pan wrote:
>>>>> Why can't you do dynamic reference counting of your structure, that
>>>>> would allow you to get rid of your global array, right?
>>>>>
>>>>
>>>> Thanks for your nice comments.
>>>> Struct gsm has a ref-count already. :)
>>>
>>> Then you should be fine, no need to keep it in an array.
>>>
>>>> And also adding a ref-count is a little hard to me. :(
>>>> This global array is used to keep tracking the gsms that stands for the gsmttyXX.
>>>
>>> You shouldn't need that at all, just use a list, you don't care what the
>>> XX number is within the driver, just allocate a new one with the next
>>> available number and you should be fine.
>>>
>>>> and it can tell us if we can create a new gsm. :)
>>>
>>> You should always be able to create a new gsm if you need to :)
>>>
>>>> In gsm_init we set *gsm_tty_driver = alloc_tty_driver(256);*
>>>
>>> Why limit to 256?  Just use a list, and a idr structure to allocate the
>>> minor number, and all should be good.
>>
>> Hi Greg,
>>
>> This is still broken in the gsm driver.
>>
>> As much as I'd like to see someone take ownership of the gsm driver and
>> do this 'the right way', I think until that happens we should consider
>> fixing the reuse-while-in-use error.
> 
> What happened to the gsm driver maintainers?

hahaha

$ ./scripts/get_maintainer.pl -f drivers/tty/n_gsm.c 
Greg Kroah-Hartman <gregkh@...uxfoundation.org> (supporter:TTY LAYER)
Jiri Slaby <jslaby@...e.cz> (supporter:TTY LAYER)
linux-kernel@...r.kernel.org (open list)

>> Would you be willing to take a patch from me that just does the bare
>> minimum to keep this from panicking in the cdev code?
> 
> Depends on what the patch looks like :)
> 
> Send it on, and I'll be glad to review it.

Ok.

Regards,
Peter Hurley
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