linux-kernel - Re: [2.4 patch] Port of adutux driver from 2.6 kernel to 2.4.

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Date:	Tue, 16 Oct 2007 07:59:05 -0700
From:	Greg KH <gregkh@...e.de>
To:	Vitaliy Ivanov <vitalivanov@...il.com>
Cc:	Pete Zaitcev <zaitcev@...hat.com>, Willy Tarreau <w@....eu>,
	linux-usb-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [2.4 patch] Port of adutux driver from 2.6 kernel to 2.4.

On Tue, Oct 16, 2007 at 04:48:54PM +0300, Vitaliy Ivanov wrote:
> Pete,
> 
> On Mon, 2007-10-15 at 20:30, Pete Zaitcev wrote:
> 
> > > +	in_end_size = le16_to_cpu(dev->interrupt_in_endpoint->wMaxPacketSize);
> > > +	out_end_size = le16_to_cpu(dev->interrupt_out_endpoint->wMaxPacketSize);
> > 
> > Did you verify if this works? We use pre-swapped descriptors in 2.4.
> > I suspect you allocate 256 times more memory than necessary.
> 
> Just checked. Seems to be OK. At least printk shows shows it.

That's probably because you tested this on a little-endian machine :)

Pete is right, this code is incorrect for 2.4, drop the le16_to_cpu
function, the wMaxPacketSize variable is in native-endian form in 2.4
and early 2.6 versions.

thanks,

greg k-h
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