From: Stefan Richter <stefanr@s5r6.in-berlin.de>
Date: Sun, 21 Feb 2010 16:58:52 +0000 (+0100)
Subject: firewire: ohci: fix IR/IT context mask mixup
X-Git-Tag: v2.6.34-rc1~219^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4802f16d512d6e3b36177709d50c05df0ef52a6c;p=pandora-kernel.git

firewire: ohci: fix IR/IT context mask mixup

This bug was present in firewire-ohci since day one:  The number of
available isochronous receive DMA contexts was mixed up with that of
available isochronous transmit DMA contexts.

This is harmless on a few chips which offer the same number of contexts
in both directions, but most chips nowadays implement only the standard
minimum of 4 IR contexts, but 8 IT contexts.  If a user attempted to run
a lot of IR contexts at once, results with more than four were therefore
unpredictable.  I suppose the controller would simply refuse to start
DMA of any unimplemented context.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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