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SubjectRe: [PATCH] USB: storage: fix Huawei mode switching regression
Matthew Dharm <> writes:

> Frankly, I consider it appropriate.

OK, I'll try to cook something up.

> The question is not one of reminding me of what I said earlier....
> it's one of pointing people in the right direction. Frankly, some of
> the fault for this patch lies with Greg and myself for letting it
> through. I had just assumed that the Huawei guys had already been in
> touch with usb-modeswitch for some reason, and that this was just an
> optimization of existing logic (not an expansion). And, frankly, I
> was just a bit tired of fighting this fight over and over again;
> having something in the file which says "here's the right and official
> way to do this" would be good.
> I also asked the Huawei guys about the possibility of affecting other
> devices than the one listed.... I guess one of us either wasn't clear
> or mis-understood the request. The fact that there are devices out
> there failing now illustrates that. Avoiding breaking existing
> systems is one of the highest priorities....

Well, I am a bit embarrassed by this. I did notice the patch and even
looked through it when it was posted. But when I later noticed the
switching failure I didn't think more about it at all. I just put the
error on my to-be-investigated-further list. Which tends to erase
itself before I get to it...

> Who is maintaining usb-modeswitch these days, anyway? The comment in
> the file should point people directly there....

That would be Josua Dietze, who I intended to CC from the beginning of
this discussion but forgot... Sorry about that. I'm certainly not
going to complain about anyone else forgetting stuff :)

CCed now. Josh, I assume it's OK for you if we put a pointer to in the unusual_devs.h code?

> And, as of now, I would really like to see as many of these devices
> migrated (albeit slowly) to using usb-modeswitch wherever possible. I
> know there are a few devices for which that might not be possible, but
> I am DONE dealing with this same issue over and over and over again.
> It will certainly be work to migrate support; maybe we should wrap all
> the relevant unusual_devs.h entires with
> transition period?

Sounds good to me, if that is acceptable to the user interface stability

I guess the real problem will be verifying that all of the entries *can*
go away. This type of hardware tends to get old very fast, but there is
always someone having a really ancient device.

Maybe we could use the same method the netdev people use when they want
to remove stuff: Subtly break it and leave it like that for a few years
before finally deleting it, arguing that noone can be using the feature
because it's broken :)


> On Mon, Mar 4, 2013 at 8:47 AM, Bjørn Mork <> wrote:
>> Ben Hutchings <> writes:
>>> On Mon, 2013-03-04 at 14:19 +0100, Bjørn Mork wrote:
>>> [...]
>>>> In-kernel mode switching was deprecated years ago with the
>>>> development of the more user friendly userspace alternatives. The
>>>> existing list of devices in usb-storage was only kept to prevent
>>>> breaking already working systems. The long term plan is to remove
>>>> the list, not to add to it. Ref:
>>> [...]
>>> Can you add a comment to this effect?
>> In the table in unusual_devs.h, you mean? Sure, I can do that.
>> But it feels a bit strange since I can only quote and/or refer to what
>> Matthew and Greg said about the issue years ago. Putting a comment in
>> the code to remind the current maintainers about their own statements
>> could be considered out of line? Or is this appropriate here?
>> Bjørn
> --
> Matthew Dharm
> Maintainer, USB Mass Storage driver for Linux
> --
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