nfsd4: remove check_conflicting_opens warning

[ Upstream commit 50747dd5e47bde3b7d7f839c84d0d3b554090497 ]

There are actually rare races where this is possible (e.g. if a new open
intervenes between the read of i_writecount and the fi_fds).

Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 0525acfe3131404466553243334ce0865faf818d..1f646a27481fb995ab0944ad3f695f47a9bb6b81 100644 (file)
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4954,7 +4954,6 @@ static int nfsd4_check_conflicting_opens(struct nfs4_client *clp,
                writes--;
        if (fp->fi_fds[O_RDWR])
                writes--;
-       WARN_ON_ONCE(writes < 0);
        if (writes > 0)
                return -EAGAIN;
        spin_lock(&fp->fi_lock);