Re: [PATCH 3/6] cifs: add a warning when the in-flight count goes negative

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On Sun, Jun 11, 2023 at 1:19 AM Steve French <smfrench@xxxxxxxxx> wrote:
>
> should this be a warn once? Could it get very noisy?
>
> On Fri, Jun 9, 2023 at 12:47 PM Shyam Prasad N <nspmangalore@xxxxxxxxx> wrote:
> >
> > 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@xxxxxxxxxxxxx>
> > ---
> >  fs/smb/client/smb2ops.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c
> > index 6e3be58cfe49..43162915e03c 100644
> > --- a/fs/smb/client/smb2ops.c
> > +++ b/fs/smb/client/smb2ops.c
> > @@ -91,6 +91,7 @@ smb2_add_credits(struct TCP_Server_Info *server,
> >                                             server->conn_id, server->hostname, *val,
> >                                             add, server->in_flight);
> >         }
> > +       WARN_ON(server->in_flight == 0);
> >         server->in_flight--;
> >         if (server->in_flight == 0 &&
> >            ((optype & CIFS_OP_MASK) != CIFS_NEG_OP) &&
> > --
> > 2.34.1
> >
>
>
> --
> Thanks,
>
> Steve

Makes sense. We can have a warn once.

-- 
Regards,
Shyam




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