From: Rusty Russell <rusty@rustcorp.com.au>
Date: Mon, 7 Apr 2008 04:30:28 +0000 (+1000)
Subject: virtio: remove overzealous BUG_ON.
X-Git-Tag: v2.6.25-rc9~52
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2557a933b795c1988c721ebb871cd735128bb9cb;p=pandora-kernel.git

virtio: remove overzealous BUG_ON.

The 'disable_cb' callback is designed as an optimization to tell the host
we don't need callbacks now.  As it is not reliable, the debug check is
overzealous: it can happen on two CPUs at the same time.  Document this.

Even if it were reliable, the virtio_net driver doesn't disable
callbacks on transmit so the START_USE/END_USE debugging reentrance
protection can be easily tripped even on UP.

Thanks to Balaji Rao for the bug report and testing.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
CC: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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