IB/mlx4: Fix MTT leakage in resize CQ

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When resizing a CQ, MTTs associated with the old CQE buffer were not
freed.  As a result, if any app used resize CQ repeatedly, all MTTs
were eventually exhausted, which led to all memory registration
operations failing until the driver is reloaded.

Once the RESIZE_CQ command returns successfully from FW, FW no longer
accesses the old CQ buffer, so it is safe to deallocate the MTT
entries used by the old CQ buffer.

Finally, if the RESIZE_CQ command fails, the MTTs allocated for the
new CQEs buffer also need to be de-allocated.

This fixes <https://bugs.openfabrics.org/show_bug.cgi?id=1416>.

Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

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Jack Morgenstein 2008-12-01 10:09:37 -08:00 • committed by Roland Dreier

parent 9a5aa622dd

commit 42ab01c315

1 changed files with 5 additions and 0 deletions

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drivers/infiniband/hw/mlx4/cq.c

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