tree 28750ce9e633081f8e814d69a3f3d21fd71359f8
parent 22db37ec5fd51b0c77b1dd5751b1cdc2672c08d6
author Roland Dreier <rolandd@cisco.com> 1157067786 -0700
committer Roland Dreier <rolandd@cisco.com> 1157070356 -0700

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>