[Cluster-devel] [PATCH] dlm: don't overwrite castparam if it's NULL

[Patrick Caulfield]

If the castaddr passed to the userland API is NULL then don't overwrite the
existing castparam. This allows a different thread to cancel a lock request and
the CANCEL AST gets delivered to the original thread.

bz#306391 (for RHEL4) refers.

Signed-Off-By: Patrick Caulfield <pcaulfie at redhat.com>

Patrick
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