linux-kernel - Re: [PATCH] 2.4: Back-port of pl2303.c from 2.6.24.1

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Message-ID: <20080221213345.GB24191@kroah.com>
Date:	Thu, 21 Feb 2008 13:33:45 -0800
From:	Greg KH <greg@...ah.com>
To:	Willy Tarreau <w@....eu>
Cc:	David Newall <davidn@...idnewall.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] 2.4: Back-port of pl2303.c from 2.6.24.1

On Thu, Feb 21, 2008 at 10:00:58PM +0100, Willy Tarreau wrote:
> Hi Greg, Hi David,
> 
> On Thu, Feb 21, 2008 at 12:36:40PM -0800, Greg KH wrote:
> > On Fri, Feb 22, 2008 at 06:51:34AM +1030, David Newall wrote:
> > > Hi Willy,
> > > 
> > > Lacking hardware for a week, I've had a bit of a hiatus from PL2303, but
> > > I've got it back again now, and finished my work back-porting the 2.6
> > > driver to 2.4.  Here's a new patch, which is more complete than my
> > > previous one.  It's based on the 2.6.24.1.
> > > 
> > > There's a lot of trivial white-space changes and some things that have
> > > been moved, which make the patch rather larger than it could be.  I
> > > didn't include those changes before, but have now in order that the
> > > driver be closer to the 2.6 driver.  It'll never be identical, of course.
> > > 
> > > Note, too, that the 2.6 driver (and thus the patched 2.4) includes a 1k
> > > circular buffer which rather duplicates a buffer in the 2.4 usbserial.c;
> > > 2.6's usb-serial has had that buffer removed.  As the buffer resolves
> > > loss of the occasional putchar (e.g. from n_tty's opost), it is
> > > important and correct, even in 2.4.
> > > 
> > > Speaking as a user, I no longer see any problems with PL2303, and I
> > > think this is okay to release.
> > 
> > If this works for you, I have no objection to it, but I can't test it as
> > I don't run 2.4 on anything anymore :)
> 
> I too agree to merge, it especially since it fixed several problems
> for David. However, I would like to know first if the same problems
> also happen with the 2.6 driver or if it is OK. The risk is getting
> 2.4 fixed and not 2.6, which could cause regressions for people upgrading
> from 2.4 to 2.6. Of course, a regression on a USB-serial adapter is
> not dramatic, but it's a general principle to keep in mind that 2.6
> should be safe (or at least actively being fixed) when merging driver
> changes in 2.4.

As far as I can tell, this was a backport of the current 2.6 driver, so
it should not have fixes that are not already in 2.6.

David, is that true?

thanks,

greg k-h
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