From: Felipe Contreras <felipe.contreras@nokia.com>
Date: Sat, 12 Mar 2011 00:29:06 +0000 (-0600)
Subject: staging: tidspbridge: protect dmm_map properly
X-Git-Tag: v2.6.37.5~42
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8274b24b773d6433c461d38944cacc8eb8e574af;p=pandora-kernel.git

staging: tidspbridge: protect dmm_map properly

commit ab42abf33a3efdf754710a0a513c00c40854cd61 upstream.

We need to protect not only the dmm_map list, but the individual
map_obj's, otherwise, we might be building the scatter-gather list with
garbage. So, use the existing proc_lock for that.

I observed race conditions which caused kernel panics while running
stress tests, also, Tuomas Kulve found it happening quite often in
Gumstix Over. This patch fixes those.

Cc: Tuomas Kulve <tuomas@kulve.fi>
Signed-off-by: Felipe Contreras <felipe.contreras@nokia.com>
Signed-off-by: Omar Ramirez Luna <omar.ramirez@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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