From: Matthew Wilcox <matthew@wil.cx>
Date: Thu, 20 Nov 2008 21:09:33 +0000 (-0700)
Subject: x86: Fix interrupt leak due to migration
X-Git-Tag: v2.6.28-rc6~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0ca4b6b00113b064c080d26d803d0d7c80fb5dc8;p=pandora-kernel.git

x86: Fix interrupt leak due to migration

When we migrate an interrupt from one CPU to another, we set the
move_in_progress flag and clean up the vectors later once they're not
being used.  If you're unlucky and call destroy_irq() before the vectors
become un-used, the move_in_progress flag is never cleared, which causes
the interrupt to become unusable.

This was discovered by Jesse Brandeburg for whom it manifested as an
MSI-X device refusing to use MSI-X mode when the driver was unloaded
and reloaded repeatedly.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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