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  1. 31 Jan, 2006 2 commits
    • Roland Dreier's avatar
      IB/mthca: Semaphore to mutex conversions · fd9cfdd1
      Roland Dreier authored 
      Convert semaphores to mutexes in mthca.  Leave firmware command
interface poll_sem and event_sem as semaphores.
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      fd9cfdd1
    • Michael S. Tsirkin's avatar
      IB/mthca: Don't cancel commands on a signal · e3aa31c5
      Michael S. Tsirkin authored 
      We have run into the following problem: if a task receives a signal
while in the process of e.g. destroying a resource (which could be
because the relevant file was closed) mthca could bail out from trying
to take a command interface semaphore without performing the
appropriate command to tell hardware that the resource is being
destroyed.

As a result we see messages like
 ib_mthca 0000:04:00.0: HW2SW_CQ failed (-4)

In this case, hardware could access the resource after the memory has
been freed, possibly causing memory corruption.

A simple solution is to replace down_interruptible() by down() in
command interface activation.
Signed-off-by: default avatarMichael S. Tsirkin <mst@mellanox.co.il>
[ It's also not safe to bail out on multicast table operations, since
  they may be invoked on the cleanup path too.  So use down() for
  mcg_table.sem too. ]
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      e3aa31c5
  3. 30 Jan, 2006 2 commits
  5. 21 Jan, 2006 1 commit
  7. 17 Jan, 2006 35 commits