linux-kernel - Re: USB transfer_buffer allocations on 64bit systems

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Message-ID: <20100407153551.GK30801@buzzloop.caiaq.de>
Date:	Wed, 7 Apr 2010 17:35:51 +0200
From:	Daniel Mack <daniel@...aq.de>
To:	Greg KH <greg@...ah.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, Pedro Ribeiro <pedrib@...il.com>,
	akpm@...ux-foundation.org, Greg KH <gregkh@...e.de>,
	alsa-devel@...a-project.org, linux-usb@...r.kernel.org
Subject: Re: USB transfer_buffer allocations on 64bit systems

On Wed, Apr 07, 2010 at 08:31:54AM -0700, Greg KH wrote:
> On Wed, Apr 07, 2010 at 05:11:25PM +0200, Daniel Mack wrote:
> > I vote for a clean solution, a fixup of existing implementations and
> > a clear note about how to allocate buffers for USB drivers. I believe
> > faulty allocations of this kind can explain quite a lot of problems on
> > x86_64 machines.
> 
> Yeah, I really don't want to have to change every driver in different
> ways just depending on if someone thinks it is going to need to run on
> this wierd hardware.
> 
> Alan, any objection to just using usb_buffer_alloc() for every driver?
> Or is that too much overhead?

FWIW, most drivers I've seen in the past hours use a wild mix of
kmalloc(), kzalloc(), kcalloc() and usb_buffer_alloc(). That should
really be unified.

Daniel

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