linux-kernel - Re: [RFC] DMA mapping error check analysis

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Message-ID: <20120910212804.30342e41@stein>
Date:	Mon, 10 Sep 2012 21:28:04 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Clemens Ladisch <clemens@...isch.de>
Cc:	shuah.khan@...com, LKML <linux-kernel@...r.kernel.org>,
	linux1394-devel@...ts.sf.net, shuahkhan@...il.com
Subject: Re: [RFC] DMA mapping error check analysis

On Sep 10 Clemens Ladisch wrote:
> fw_iso_buffer_map_dma() maps as many pages as it can, and saves in
> ->page_count_mapped how many pages need unmapping.
> 
> When fw_iso_buffer_map_dma() fails, ioctl_create_iso_context() does _not_
> call fw_iso_buffer_destroy() but takes care to not change the cdev's
> state in any other way.  So ioctl_create_iso_context() can be called
> again and will then call fw_iso_buffer_map_dma(), which will happily
> map the pages a second time, overwriting the previous mapped addresses.

Indeed; thank you.  I make a note to fix this when I get some time.
-- 
Stefan Richter
-=====-===-- =--= -=-=-
http://arcgraph.de/sr/
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