xprtrdma: Prevent dereferencing r_xprt->rx_ep after it is freed

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r_xprt->rx_ep is known to be good while the transport's send lock is
held.  Otherwise additional references on rx_ep must be held when it
is used outside of that lock's critical sections.

For now, bump the rx_ep reference count once whenever there is at
least one outstanding Receive WR. This avoids the memory bandwidth
overhead of taking and releasing the reference count for every
ib_post_recv() and Receive completion.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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Chuck Lever 2020-06-15 09:20:52 -04:00 • committed by Anna Schumaker

parent 48778464bb

commit 2acc5cae29

1 changed files with 23 additions and 10 deletions

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33

net/sunrpc/xprtrdma/verbs.c

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