netdev - Re: [PATCH 7/9 net-next] sunrpc: replace if/BUG by BUG

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Date:	Tue, 31 Mar 2015 21:00:41 +0200 (CEST)
From:	Fabian Frederick <fabf@...net.be>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Trond Myklebust <trond.myklebust@...marydata.com>,
	linux-nfs@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Anna Schumaker <anna.schumaker@...app.com>,
	Julia Lawall <Julia.Lawall@...6.fr>
Subject: Re: [PATCH 7/9 net-next] sunrpc: replace if/BUG by BUG_ON



> On 30 March 2015 at 23:25 "J. Bruce Fields" <bfields@...ldses.org> wrote:
>
>
> Huh, I thought this wasn't recommended:
>
>       http://lkml.kernel.org/r/20040828125816.206ef7fa.akpm@osdl.org
>
>       "I'd prefer that we not move code which has side-effects into
>       BUG_ONs"

Thanks for the link, I wasn't aware of that problem. Maybe we should add some
documentation and fix coccinelle detection then ?

Regards,
Fabian

>
> --b.
>
> On Mon, Mar 30, 2015 at 11:13:15PM +0200, Fabian Frederick wrote:
> > Signed-off-by: Fabian Frederick <fabf@...net.be>
> > ---
> >  net/sunrpc/auth_gss/svcauth_gss.c | 9 +++------
> >  net/sunrpc/svc_xprt.c             | 3 +--
> >  2 files changed, 4 insertions(+), 8 deletions(-)
> >
> > diff --git a/net/sunrpc/auth_gss/svcauth_gss.c
> > b/net/sunrpc/auth_gss/svcauth_gss.c
> > index 1095be9..09f8a1c6 100644
> > --- a/net/sunrpc/auth_gss/svcauth_gss.c
> > +++ b/net/sunrpc/auth_gss/svcauth_gss.c
> > @@ -840,11 +840,9 @@ unwrap_integ_data(struct svc_rqst *rqstp, struct
> > xdr_buf *buf, u32 seq, struct g
> >             return stat;
> >     if (integ_len > buf->len)
> >             return stat;
> > -   if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
> > -           BUG();
> > +   BUG_ON(xdr_buf_subsegment(buf, &integ_buf, 0, integ_len));
> >     /* copy out mic... */
> > -   if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
> > -           BUG();
> > +   BUG_ON(read_u32_from_xdr_buf(buf, integ_len, &mic.len));
> >     if (mic.len > RPC_MAX_AUTH_SIZE)
> >             return stat;
> >     mic.data = kmalloc(mic.len, GFP_KERNEL);
> > @@ -1595,8 +1593,7 @@ svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
> >     BUG_ON(integ_len % 4);
> >     *p++ = htonl(integ_len);
> >     *p++ = htonl(gc->gc_seq);
> > -   if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len))
> > -           BUG();
> > +   BUG_ON(xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len));
> >     if (resbuf->tail[0].iov_base == NULL) {
> >             if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
> >                     goto out_err;
> > diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
> > index 163ac45..2f82e8b 100644
> > --- a/net/sunrpc/svc_xprt.c
> > +++ b/net/sunrpc/svc_xprt.c
> > @@ -960,8 +960,7 @@ static void svc_delete_xprt(struct svc_xprt *xprt)
> >     struct svc_deferred_req *dr;
> > 
> >     /* Only do this once */
> > -   if (test_and_set_bit(XPT_DEAD, &xprt->xpt_flags))
> > -           BUG();
> > +   BUG_ON(test_and_set_bit(XPT_DEAD, &xprt->xpt_flags));
> > 
> >     dprintk("svc: svc_delete_xprt(%p)\n", xprt);
> >     xprt->xpt_ops->xpo_detach(xprt);
> > --
> > 1.9.1
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