linux-kernel - Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi

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Message-ID: <20100203223737.GA2578@srcf.ucam.org>
Date:	Wed, 3 Feb 2010 22:37:37 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	dvomlehn@...co.com, gregkh@...e.de, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial
	writes" causes gobi_loader to hang

On Wed, Feb 03, 2010 at 06:21:39PM +0100, Oliver Neukum wrote:
> Am Mittwoch, 3. Februar 2010 17:46:59 schrieb Matthew Garrett:
> > > If the FIFO is full we can do nothing. Please try the attached patch.
> > 
> > Doesn't help, I'm afraid. Does anyone have any idea why the change to 
> > use kfifo would cause this?
> 
> The logic seems sound. That is unless the kfifo code is acting up.
> Could you printk the value kfifo_len returns in usb_serial_generic_write_start()?

kfifo_len is 4096 when it gets into the fifo_full situation.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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