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| author |  Chuck Lever <chuck.lever@oracle.com>
| 2017-06-08 11:51:56 -0400 |
|---|---|---|
| committer |  Anna Schumaker <Anna.Schumaker@Netapp.com>
| 2017-07-13 16:00:10 -0400 |
| commit | 4b196dc6fee9ba838ebabf824e294a429c79b27d (patch) | |
| tree | 075fb31c1d415171267a652574eea3b139c96253 /net/sunrpc/xprtrdma/verbs.c | |
| parent | xprtrdma: On invalidation failure, remove MWs from rl_registered (diff) | |
| download | linux-4b196dc6fee9ba838ebabf824e294a429c79b27d.tar.gz linux-4b196dc6fee9ba838ebabf824e294a429c79b27d.tar.bz2 linux-4b196dc6fee9ba838ebabf824e294a429c79b27d.zip | |
xprtrdma: Pre-mark remotely invalidated MRs
There are rare cases where an rpcrdma_req and its matched
rpcrdma_rep can be re-used, via rpcrdma_buffer_put, while the RPC
reply handler is still using that req. This is typically due to a
signal firing at just the wrong instant.
As part of closing this race window, avoid using the wrong
rpcrdma_rep to detect remotely invalidated MRs. Mark MRs as
invalidated while we are sure the rep is still OK to use.
BugLink: https://bugzilla.linux-nfs.org/show_bug.cgi?id=305
Fixes: 68791649a725 ('xprtrdma: Invalidate in the RPC reply ... ')
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'net/sunrpc/xprtrdma/verbs.c')
| -rw-r--r-- | net/sunrpc/xprtrdma/verbs.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c index 3dbce9ac4327..a8be66d806dc 100644 --- a/net/sunrpc/xprtrdma/verbs.c +++ b/net/sunrpc/xprtrdma/verbs.c @@ -1187,6 +1187,7 @@ rpcrdma_get_mw(struct rpcrdma_xprt *r_xprt) if (!mw) goto out_nomws; + mw->mw_flags = 0; return mw; out_nomws: |