tree 58c15fe0987ae06873f2fe8a1b188db73fbaf796
parent 2df4f7579d212e8e0df7c8a24f57bf90f23fd516
author Ram Vepa <ram.vepa@qlogic.com> 1306503715 +0000
committer Roland Dreier <roland@purestorage.com> 1311016163 -0700

IB/qib: Fix potential deadlock with link down interrupt

There is a possibility of a deadlock due to the way locks are
acquired and released in qib_set_uevent_bits(). The function
qib_set_uevent_bits() is called in process context and it uses
spin_lock() and spin_unlock().  This same lock is acquired/released
in interrupt context which can lead to a deadlock when running on
the same cpu.

The fix is to replace spin_lock() and spin_unlock() with
spin_lock_irqsave() and spin_unlock_irqrestore() respectively in
qib_set_uevent_bits().

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>