linux-kernel - [PATCH AUTOSEL 5.9 113/147] nfsd4: remove check_conflicting

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Date:   Mon, 26 Oct 2020 19:48:31 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "J. Bruce Fields" <bfields@...hat.com>,
        Sasha Levin <sashal@...nel.org>, linux-nfs@...r.kernel.org
Subject: [PATCH AUTOSEL 5.9 113/147] nfsd4: remove check_conflicting_opens warning

From: "J. Bruce Fields" <bfields@...hat.com>

[ 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@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/nfsd/nfs4state.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 0525acfe31314..1f646a27481fb 100644
--- 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);
-- 
2.25.1