xprtrdma: Reply buffer exhaustion can be catastrophic

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Not having an rpcrdma_rep at call_allocate time can be a problem.
It means that send_request can't post a receive buffer to catch
the RPC's reply. Possible consequences are RPC timeouts or even
transport deadlock.

Instead of allowing an RPC to proceed if an rpcrdma_rep is
not available, return NULL to force call_allocate to wait and
try again.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

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Chuck Lever 2016-06-29 13:53:35 -04:00 • committed by Anna Schumaker

parent b54054ca55

commit 3d4cf35bd4

1 changed files with 5 additions and 7 deletions

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net/sunrpc/xprtrdma/verbs.c

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