linux-kernel - Re: USB serial regression 2.6.31.1 -> 2.6.31.2 [PATCH]

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Date:	Sun, 11 Oct 2009 21:54:23 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
cc:	Ben Efros <ben@...doctor.com>, fangxiaozhi <huananhu@...wei.com>,
	Greg KH <greg@...ah.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	USB list <linux-usb@...r.kernel.org>,
	Hugh Blemings <hugh@...mings.org>,
	Josua Dietze <digidietze@...isberghof.de>
Subject: Re: USB serial regression 2.6.31.1 -> 2.6.31.2 [PATCH]

On Mon, 12 Oct 2009, Benjamin Herrenschmidt wrote:

> Don't those devices support SANE_SENSE fine on LUN 0 according to
> Alan parsing of my traces ?

Not really; the device returned only the usual 18 bytes of sense data.  
But at least it did so correctly instead of failing.

>  Heh, they may even work if I actually
> populate the SD-CARD slot, I'll try later.

Possibly, but I sure wouldn't bet on it.   :-)

> I still think it's simpler and potentially more future-proof to just
> have a back-off scenario.
> 
> Now, whether we ping pong the US_FL_SANE_SENSE flag or not is minor,
> I tend to think that your approach that doesn't touch the flag might
> indeed be better.
> 
> I'll test the patch later today.

And of course there remains the question of why the serial driver
wasn't loaded and probed.  Would it make a difference if that driver
was already loaded when you plugged in the modem?

Alan Stern

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