tree 4ced0a83b6f8adcea83e478bfba004780ba71901
parent 30a366a9dabd05a0d218288b7d732649886b6a53
author Bryan Tan <bryantan@vmware.com> 1513792300 -0800
committer Jason Gunthorpe <jgg@mellanox.com> 1513897567 -0700

RDMA/vmw_pvrdma: Avoid use after free due to QP/CQ/SRQ destroy

The use of wait queues in vmw_pvrdma for handling concurrent
access to a resource leaves a race condition which can cause a use
after free bug.

Fix this by using the pattern from other drivers, complete() protected by
dec_and_test to ensure complete() is called only once.

Fixes: 29c8d9eba550 ("IB: Add vmw_pvrdma driver")
Signed-off-by: Bryan Tan <bryantan@vmware.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>