linux-kernel - Re: [PATCH 03/10] usb: catch attempts to submit urbs with a vmalloc'd transfer buffer

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Message-ID: <CAPcyv4hzw4wQ2ju3uaaHNfO+pemgWhgVdkE1Faiu3nRk3q276A@mail.gmail.com>
Date:	Thu, 8 May 2014 09:21:51 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Mathias Nyman <mathias.nyman@...ux.intel.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [PATCH 03/10] usb: catch attempts to submit urbs with a vmalloc'd
 transfer buffer

On Thu, May 8, 2014 at 9:25 AM, Mathias Nyman
<mathias.nyman@...ux.intel.com> wrote:
> From: Dan Williams <dan.j.williams@...el.com>
>
> Save someone else the debug cycles of figuring out why a driver's
> transfer request is failing or causing undefined system behavior.
> Buffers submitted for dma must come from GFP allocated / DMA-able
> memory.
>
> Return -EAGAIN matching the return value for dma_mapping_error() cases.
>
> Cc: Alan Stern <stern@...land.harvard.edu>
> Cc: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
> Cc: Mathias Nyman <mathias.nyman@...ux.intel.com>
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>

Thanks Mathias.

One note, this was acked-by Alan here:

http://marc.info/?l=linux-usb&m=139327920501989&w=2
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