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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id y194sm38405468pfg.116.2019.07.30.09.59.03 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 30 Jul 2019 09:59:03 -0700 (PDT) Date: Tue, 30 Jul 2019 09:59:02 -0700 From: Kees Cook To: "Gustavo A. R. Silva" Cc: Julian Wiedmann , Ursula Braun , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] s390/net: Mark expected switch fall-throughs Message-ID: <201907300959.12D21B6F09@keescook> References: <20190730001715.GA20706@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20190730001715.GA20706@embeddedor> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 29, 2019 at 07:17:15PM -0500, Gustavo A. R. Silva wrote: > Mark switch cases where we are expecting to fall through. > > This patch fixes the following warnings (Building: s390): > > drivers/s390/net/ctcm_fsms.c: In function ‘ctcmpc_chx_attnbusy’: > drivers/s390/net/ctcm_fsms.c:1703:6: warning: this statement may fall through [-Wimplicit-fallthrough=] > if (grp->changed_side == 1) { > ^ > drivers/s390/net/ctcm_fsms.c:1707:2: note: here > case MPCG_STATE_XID0IOWAIX: > ^~~~ > > drivers/s390/net/ctcm_mpc.c: In function ‘ctc_mpc_alloc_channel’: > drivers/s390/net/ctcm_mpc.c:358:6: warning: this statement may fall through [-Wimplicit-fallthrough=] > if (callback) > ^ > drivers/s390/net/ctcm_mpc.c:360:2: note: here > case MPCG_STATE_XID0IOWAIT: > ^~~~ > > drivers/s390/net/ctcm_mpc.c: In function ‘mpc_action_timeout’: > drivers/s390/net/ctcm_mpc.c:1469:6: warning: this statement may fall through [-Wimplicit-fallthrough=] > if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && > ^ > drivers/s390/net/ctcm_mpc.c:1472:2: note: here > default: > ^~~~~~~ > drivers/s390/net/ctcm_mpc.c: In function ‘mpc_send_qllc_discontact’: > drivers/s390/net/ctcm_mpc.c:2087:6: warning: this statement may fall through [-Wimplicit-fallthrough=] > if (grp->estconnfunc) { > ^ > drivers/s390/net/ctcm_mpc.c:2092:2: note: here > case MPCG_STATE_FLOWC: > ^~~~ > > drivers/s390/net/qeth_l2_main.c: In function ‘qeth_l2_process_inbound_buffer’: > drivers/s390/net/qeth_l2_main.c:328:7: warning: this statement may fall through [-Wimplicit-fallthrough=] > if (IS_OSN(card)) { > ^ > drivers/s390/net/qeth_l2_main.c:337:3: note: here > default: > ^~~~~~~ > > Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook -Kees > --- > drivers/s390/net/ctcm_fsms.c | 1 + > drivers/s390/net/ctcm_mpc.c | 3 +++ > drivers/s390/net/qeth_l2_main.c | 2 +- > 3 files changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/s390/net/ctcm_fsms.c b/drivers/s390/net/ctcm_fsms.c > index 1b4ee570b712..4a8a5373cb35 100644 > --- a/drivers/s390/net/ctcm_fsms.c > +++ b/drivers/s390/net/ctcm_fsms.c > @@ -1704,6 +1704,7 @@ static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg) > grp->changed_side = 2; > break; > } > + /* Else, fall through */ > case MPCG_STATE_XID0IOWAIX: > case MPCG_STATE_XID7INITW: > case MPCG_STATE_XID7INITX: > diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c > index e02f295d38a9..1534420a0243 100644 > --- a/drivers/s390/net/ctcm_mpc.c > +++ b/drivers/s390/net/ctcm_mpc.c > @@ -357,6 +357,7 @@ int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) > /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ > if (callback) > grp->send_qllc_disc = 1; > + /* Else, fall through */ > case MPCG_STATE_XID0IOWAIT: > fsm_deltimer(&grp->timer); > grp->outstanding_xid2 = 0; > @@ -1469,6 +1470,7 @@ static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) > if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && > (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) > break; > + /* Else, fall through */ > default: > fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); > } > @@ -2089,6 +2091,7 @@ static int mpc_send_qllc_discontact(struct net_device *dev) > grp->estconnfunc = NULL; > break; > } > + /* Else, fall through */ > case MPCG_STATE_FLOWC: > case MPCG_STATE_READY: > grp->send_qllc_disc = 2; > diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c > index fd64bc3f4062..cbead3d1b2fd 100644 > --- a/drivers/s390/net/qeth_l2_main.c > +++ b/drivers/s390/net/qeth_l2_main.c > @@ -333,7 +333,7 @@ static int qeth_l2_process_inbound_buffer(struct qeth_card *card, > card->osn_info.data_cb(skb); > break; > } > - /* else unknown */ > + /* Else, fall through */ > default: > dev_kfree_skb_any(skb); > QETH_CARD_TEXT(card, 3, "inbunkno"); > -- > 2.22.0 > -- Kees Cook