From: Anssi Hannula <anssi.hannula@iki.fi>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Oliver Neukum <oliver@neukum.org>,
Matthew Garrett <mjg59@srcf.ucam.org>,
dvomlehn@cisco.com, gregkh@suse.de, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi_loader to hang
Date: Mon, 22 Feb 2010 21:24:27 +0200 [thread overview]
Message-ID: <201002222124.27777.anssi.hannula@iki.fi> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1002221408200.1251-100000@iolanthe.rowland.org>
On maanantai 22 helmikuu 2010 21:10:33 Alan Stern wrote:
> On Mon, 22 Feb 2010, Anssi Hannula wrote:
> > I guess that would suggest that the device doesn't allow the
> > initialization data to be broken into packets arbitrarily (though some
> > differences seem allowed, as the windows driver transmits them
> > differently).
> >
> > Does this mean a tty interface is ill-suited for the microcode upload,
> > and instead qcserial should use the kernel's generic microcode upload
> > mechanism or the userspace should use libusb to do it?
>
> I don't know. Didn't the old successful code use a tty interface?
Yes, but does the tty interface guarantee that the data of one write call is
sent as one packet to the device?
If I understood this correctly, it seems the changes have caused it to now
concatenate short writes into one packet, which the device doesn't seem to
like.
--
Anssi Hannula
next prev parent reply other threads:[~2010-02-22 19:24 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-17 2:55 [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi_loader to hang Matthew Garrett
2010-01-17 8:13 ` Marcel Holtmann
2010-01-17 9:14 ` Oliver Neukum
2010-01-18 1:58 ` Matthew Garrett
2010-01-18 17:25 ` Oliver Neukum
2010-01-18 20:14 ` Matthew Garrett
2010-01-19 13:20 ` Oliver Neukum
2010-01-19 13:29 ` Alan Cox
2010-01-19 13:57 ` Oliver Neukum
2010-01-19 14:21 ` Alan Cox
2010-01-19 15:15 ` Oliver Neukum
2010-01-19 14:26 ` Alan Cox
2010-01-19 15:25 ` Johan Hovold
2010-01-19 15:52 ` Johan Hovold
2010-01-19 16:27 ` Alan Cox
2010-01-19 18:44 ` Oliver Neukum
2010-01-19 19:45 ` Johan Hovold
2010-01-28 17:45 ` Greg KH
2010-01-28 18:40 ` Oliver Neukum
2010-01-28 22:32 ` Greg KH
2010-02-03 16:46 ` Matthew Garrett
2010-02-03 17:21 ` Oliver Neukum
2010-02-03 22:37 ` Matthew Garrett
2010-02-03 22:58 ` Oliver Neukum
2010-02-05 19:58 ` Matthew Garrett
2010-02-05 21:35 ` Matthew Garrett
2010-02-08 19:00 ` Oliver Neukum
2010-02-05 21:59 ` Oliver Neukum
2010-02-13 2:09 ` Anssi Hannula
2010-02-13 2:50 ` Alan Stern
2010-02-13 7:11 ` Oliver Neukum
2010-02-13 13:35 ` Anssi Hannula
2010-02-13 19:01 ` Anssi Hannula
2010-02-15 13:08 ` Oliver Neukum
2010-02-20 16:03 ` Anssi Hannula
2010-02-20 18:19 ` Oliver Neukum
2010-02-21 21:28 ` Alan Stern
2010-02-21 21:42 ` Anssi Hannula
2010-02-21 22:12 ` Oliver Neukum
2010-02-21 23:06 ` Anssi Hannula
2010-02-21 23:13 ` Anssi Hannula
2010-02-21 23:21 ` Anssi Hannula
2010-02-22 15:28 ` Alan Stern
2010-02-22 18:35 ` Anssi Hannula
2010-02-22 19:10 ` Alan Stern
2010-02-22 19:14 ` Matthew Garrett
2010-02-22 20:12 ` Alan Stern
2010-02-24 2:33 ` Anssi Hannula
2010-02-22 19:24 ` Anssi Hannula [this message]
2010-02-22 20:10 ` Alan Stern
2010-02-22 21:24 ` Alan Cox
2010-02-22 21:23 ` Matthew Garrett
2010-02-22 23:26 ` Oliver Neukum
2010-02-23 1:55 ` Anssi Hannula
2010-02-21 22:09 ` Oliver Neukum
2010-02-21 21:37 ` Anssi Hannula
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