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cifs: add a warning when the in-flight count goes negative

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[ Upstream commit e4645cc2f1e2d6f268bb8dcfac40997c52432aed ]

We've seen the in-flight count go into negative with some
internal stress testing in Microsoft.

Adding a WARN when this happens, in hope of understanding
why this happens when it happens.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shyam Prasad N 2023-06-09 17:46:56 +00:00 committed by Greg Kroah-Hartman
parent e410dfaaac
commit b6c4a44e89
1 changed files with 1 additions and 0 deletions
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fs/cifs/smb2ops.c
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@ -82,6 +82,7 @@ smb2_add_credits(struct TCP_Server_Info *server,
*val = 65000; /* Don't get near 64K credits, avoid srv bugs */
pr_warn_once("server overflowed SMB3 credits\n");
}
WARN_ON_ONCE(server->in_flight == 0);
server->in_flight--;
if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
rc = change_conf(server);