IB/qib: Fix potential deadlock with link down interrupt

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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>

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Ram Vepa 2011-05-27 13:41:55 +00:00 • committed by Roland Dreier

parent 2df4f7579d

commit 4356d0b64b

1 changed files with 3 additions and 2 deletions

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5

drivers/infiniband/hw/qib/qib_file_ops.c

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