From: Roland Dreier <rolandd@cisco.com>
Date: Thu, 31 Aug 2006 23:43:06 +0000 (-0700)
Subject: IB/mthca: Use IRQ safe locks to protect allocation bitmaps
X-Git-Tag: v2.6.18-rc6~27^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5a4e6dccbc0cd1b726820b782daebf887dcb95e9;p=pandora-kernel.git

IB/mthca: Use IRQ safe locks to protect allocation bitmaps

It is supposed to be OK to call mthca_create_ah() and mthca_destroy_ah()
from any context.  However, for mem-full HCAs, these functions use the
mthca_alloc() and mthca_free() bitmap helpers, and those helpers use
non-IRQ-safe spin_lock() internally.  Lockdep correctly warns that
this could lead to a deadlock.  Fix this by changing mthca_alloc() and
mthca_free() to use spin_lock_irqsave().

Signed-off-by: Roland Dreier <rolandd@cisco.com>
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