From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0253C43603 for ; Wed, 4 Dec 2019 16:47:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A733A2081B for ; Wed, 4 Dec 2019 16:47:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728894AbfLDQrd (ORCPT ); Wed, 4 Dec 2019 11:47:33 -0500 Received: from mga07.intel.com ([134.134.136.100]:34019 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726934AbfLDQrc (ORCPT ); Wed, 4 Dec 2019 11:47:32 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Dec 2019 08:47:32 -0800 X-IronPort-AV: E=Sophos;i="5.69,277,1571727600"; d="scan'208";a="205452139" Received: from huberth-mobl4.ger.corp.intel.com (HELO localhost) ([10.252.34.172]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Dec 2019 08:47:28 -0800 From: Jani Nikula To: Benjamin Gaignard , maarten.lankhorst@linux.intel.com, mripard@kernel.org, sean@poorly.run, airlied@linux.ie, daniel@ffwll.ch Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Benjamin Gaignard Subject: Re: [PATCH v3] drm/dp_mst: Fix W=1 warnings In-Reply-To: <20191128135057.20020-1-benjamin.gaignard@st.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20191128135057.20020-1-benjamin.gaignard@st.com> Date: Wed, 04 Dec 2019 18:47:33 +0200 Message-ID: <878snsvxzu.fsf@intel.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 28 Nov 2019, Benjamin Gaignard wrote: > Fix the warnings that show up with W=1. > They are all about unused but set variables. > If functions returns are not used anymore make them void. > > Signed-off-by: Benjamin Gaignard > --- > CC: Jani Nikula > > changes in version 3: > - remove the hunk that may conflict with c485e2c97dae > ("drm/dp_mst: Refactor pdt setup/teardown, add more locking") > > changes in version 2: > - fix indentations > - when possible change functions prototype to void > > drivers/gpu/drm/drm_dp_mst_topology.c | 83 +++++++++++++---------------------- > 1 file changed, 31 insertions(+), 52 deletions(-) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index 1437bc46368b..d5cb5688b5dd 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -674,7 +674,6 @@ static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, > u8 *replybuf, u8 replybuflen, bool hdr) > { > int ret; > - u8 crc4; > > if (hdr) { > u8 hdrlen; > @@ -716,8 +715,6 @@ static bool drm_dp_sideband_msg_build(struct drm_dp_sideband_msg_rx *msg, > } > > if (msg->curchunk_idx >= msg->curchunk_len) { > - /* do CRC */ > - crc4 = drm_dp_msg_data_crc4(msg->chunk, msg->curchunk_len - 1); Again, someone needs to check if crc4 should be *used* instead of thrown away. Blindly throwing stuff out is not the way to go. BR, Jani. > /* copy chunk into bigger msg */ > memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); > msg->curlen += msg->curchunk_len - 1; > @@ -1014,7 +1011,7 @@ static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw, > } > } > > -static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) > +static void build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes, u8 *bytes) > { > struct drm_dp_sideband_msg_req_body req; > > @@ -1024,17 +1021,14 @@ static int build_dpcd_write(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 > req.u.dpcd_write.num_bytes = num_bytes; > req.u.dpcd_write.bytes = bytes; > drm_dp_encode_sideband_req(&req, msg); > - > - return 0; > } > > -static int build_link_address(struct drm_dp_sideband_msg_tx *msg) > +static void build_link_address(struct drm_dp_sideband_msg_tx *msg) > { > struct drm_dp_sideband_msg_req_body req; > > req.req_type = DP_LINK_ADDRESS; > drm_dp_encode_sideband_req(&req, msg); > - return 0; > } > > static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int port_num) > @@ -1048,7 +1042,7 @@ static int build_enum_path_resources(struct drm_dp_sideband_msg_tx *msg, int por > return 0; > } > > -static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, > +static void build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_num, > u8 vcpi, uint16_t pbn, > u8 number_sdp_streams, > u8 *sdp_stream_sink) > @@ -1064,10 +1058,9 @@ static int build_allocate_payload(struct drm_dp_sideband_msg_tx *msg, int port_n > number_sdp_streams); > drm_dp_encode_sideband_req(&req, msg); > msg->path_msg = true; > - return 0; > } > > -static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, > +static void build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, > int port_num, bool power_up) > { > struct drm_dp_sideband_msg_req_body req; > @@ -1080,7 +1073,6 @@ static int build_power_updown_phy(struct drm_dp_sideband_msg_tx *msg, > req.u.port_num.port_number = port_num; > drm_dp_encode_sideband_req(&req, msg); > msg->path_msg = true; > - return 0; > } > > static int drm_dp_mst_assign_payload_id(struct drm_dp_mst_topology_mgr *mgr, > @@ -1746,14 +1738,13 @@ static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port, > */ > static bool drm_dp_port_setup_pdt(struct drm_dp_mst_port *port) > { > - int ret; > u8 rad[6], lct; > bool send_link = false; > switch (port->pdt) { > case DP_PEER_DEVICE_DP_LEGACY_CONV: > case DP_PEER_DEVICE_SST_SINK: > /* add i2c over sideband */ > - ret = drm_dp_mst_register_i2c_bus(&port->aux); > + drm_dp_mst_register_i2c_bus(&port->aux); > break; > case DP_PEER_DEVICE_MST_BRANCHING: > lct = drm_dp_calculate_rad(port, rad); > @@ -1823,25 +1814,20 @@ ssize_t drm_dp_mst_dpcd_write(struct drm_dp_aux *aux, > > static void drm_dp_check_mstb_guid(struct drm_dp_mst_branch *mstb, u8 *guid) > { > - int ret; > - > memcpy(mstb->guid, guid, 16); > > if (!drm_dp_validate_guid(mstb->mgr, mstb->guid)) { > if (mstb->port_parent) { > - ret = drm_dp_send_dpcd_write( > - mstb->mgr, > - mstb->port_parent, > - DP_GUID, > - 16, > - mstb->guid); > + drm_dp_send_dpcd_write(mstb->mgr, > + mstb->port_parent, > + DP_GUID, > + 16, > + mstb->guid); > } else { > - > - ret = drm_dp_dpcd_write( > - mstb->mgr->aux, > - DP_GUID, > - mstb->guid, > - 16); > + drm_dp_dpcd_write(mstb->mgr->aux, > + DP_GUID, > + mstb->guid, > + 16); > } > } > } > @@ -2197,7 +2183,7 @@ static bool drm_dp_validate_guid(struct drm_dp_mst_topology_mgr *mgr, > return false; > } > > -static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) > +static void build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 offset, u8 num_bytes) > { > struct drm_dp_sideband_msg_req_body req; > > @@ -2206,8 +2192,6 @@ static int build_dpcd_read(struct drm_dp_sideband_msg_tx *msg, u8 port_num, u32 > req.u.dpcd_read.dpcd_address = offset; > req.u.dpcd_read.num_bytes = num_bytes; > drm_dp_encode_sideband_req(&req, msg); > - > - return 0; > } > > static int drm_dp_send_sideband_msg(struct drm_dp_mst_topology_mgr *mgr, > @@ -2429,14 +2413,14 @@ static void drm_dp_send_link_address(struct drm_dp_mst_topology_mgr *mgr, > { > struct drm_dp_sideband_msg_tx *txmsg; > struct drm_dp_link_address_ack_reply *reply; > - int i, len, ret; > + int i, ret; > > txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > if (!txmsg) > return; > > txmsg->dst = mstb; > - len = build_link_address(txmsg); > + build_link_address(txmsg); > > mstb->link_address_sent = true; > drm_dp_queue_down_tx(mgr, txmsg); > @@ -2478,7 +2462,6 @@ drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, > { > struct drm_dp_enum_path_resources_ack_reply *path_res; > struct drm_dp_sideband_msg_tx *txmsg; > - int len; > int ret; > > txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL); > @@ -2486,7 +2469,7 @@ drm_dp_send_enum_path_resources(struct drm_dp_mst_topology_mgr *mgr, > return -ENOMEM; > > txmsg->dst = mstb; > - len = build_enum_path_resources(txmsg, port->port_num); > + build_enum_path_resources(txmsg, port->port_num); > > drm_dp_queue_down_tx(mgr, txmsg); > > @@ -2569,7 +2552,7 @@ static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, > { > struct drm_dp_sideband_msg_tx *txmsg; > struct drm_dp_mst_branch *mstb; > - int len, ret, port_num; > + int ret, port_num; > u8 sinks[DRM_DP_MAX_SDP_STREAMS]; > int i; > > @@ -2594,9 +2577,9 @@ static int drm_dp_payload_send_msg(struct drm_dp_mst_topology_mgr *mgr, > sinks[i] = i; > > txmsg->dst = mstb; > - len = build_allocate_payload(txmsg, port_num, > - id, > - pbn, port->num_sdp_streams, sinks); > + build_allocate_payload(txmsg, port_num, > + id, > + pbn, port->num_sdp_streams, sinks); > > drm_dp_queue_down_tx(mgr, txmsg); > > @@ -2625,7 +2608,7 @@ int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port, bool power_up) > { > struct drm_dp_sideband_msg_tx *txmsg; > - int len, ret; > + int ret; > > port = drm_dp_mst_topology_get_port_validated(mgr, port); > if (!port) > @@ -2638,7 +2621,7 @@ int drm_dp_send_power_updown_phy(struct drm_dp_mst_topology_mgr *mgr, > } > > txmsg->dst = port->parent; > - len = build_power_updown_phy(txmsg, port->port_num, power_up); > + build_power_updown_phy(txmsg, port->port_num, power_up); > drm_dp_queue_down_tx(mgr, txmsg); > > ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); > @@ -2858,7 +2841,6 @@ static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port, > int offset, int size, u8 *bytes) > { > - int len; > int ret = 0; > struct drm_dp_sideband_msg_tx *txmsg; > struct drm_dp_mst_branch *mstb; > @@ -2873,7 +2855,7 @@ static int drm_dp_send_dpcd_read(struct drm_dp_mst_topology_mgr *mgr, > goto fail_put; > } > > - len = build_dpcd_read(txmsg, port->port_num, offset, size); > + build_dpcd_read(txmsg, port->port_num, offset, size); > txmsg->dst = port->parent; > > drm_dp_queue_down_tx(mgr, txmsg); > @@ -2911,7 +2893,6 @@ static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, > struct drm_dp_mst_port *port, > int offset, int size, u8 *bytes) > { > - int len; > int ret; > struct drm_dp_sideband_msg_tx *txmsg; > struct drm_dp_mst_branch *mstb; > @@ -2926,7 +2907,7 @@ static int drm_dp_send_dpcd_write(struct drm_dp_mst_topology_mgr *mgr, > goto fail_put; > } > > - len = build_dpcd_write(txmsg, port->port_num, offset, size, bytes); > + build_dpcd_write(txmsg, port->port_num, offset, size, bytes); > txmsg->dst = mstb; > > drm_dp_queue_down_tx(mgr, txmsg); > @@ -3149,7 +3130,7 @@ static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) > { > int len; > u8 replyblock[32]; > - int replylen, origlen, curreply; > + int replylen, curreply; > int ret; > struct drm_dp_sideband_msg_rx *msg; > int basereg = up ? DP_SIDEBAND_MSG_UP_REQ_BASE : DP_SIDEBAND_MSG_DOWN_REP_BASE; > @@ -3169,7 +3150,6 @@ static bool drm_dp_get_one_sb_msg(struct drm_dp_mst_topology_mgr *mgr, bool up) > } > replylen = msg->curchunk_len + msg->curchunk_hdrlen; > > - origlen = replylen; > replylen -= len; > curreply = len; > while (replylen > 0) { > @@ -3961,17 +3941,16 @@ void drm_dp_mst_dump_topology(struct seq_file *m, > mutex_lock(&mgr->lock); > if (mgr->mst_primary) { > u8 buf[DP_PAYLOAD_TABLE_SIZE]; > - int ret; > > - ret = drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); > + drm_dp_dpcd_read(mgr->aux, DP_DPCD_REV, buf, DP_RECEIVER_CAP_SIZE); > seq_printf(m, "dpcd: %*ph\n", DP_RECEIVER_CAP_SIZE, buf); > - ret = drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); > + drm_dp_dpcd_read(mgr->aux, DP_FAUX_CAP, buf, 2); > seq_printf(m, "faux/mst: %*ph\n", 2, buf); > - ret = drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); > + drm_dp_dpcd_read(mgr->aux, DP_MSTM_CTRL, buf, 1); > seq_printf(m, "mst ctrl: %*ph\n", 1, buf); > > /* dump the standard OUI branch header */ > - ret = drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); > + drm_dp_dpcd_read(mgr->aux, DP_BRANCH_OUI, buf, DP_BRANCH_OUI_HEADER_SIZE); > seq_printf(m, "branch oui: %*phN devid: ", 3, buf); > for (i = 0x3; i < 0x8 && buf[i]; i++) > seq_printf(m, "%c", buf[i]); -- Jani Nikula, Intel Open Source Graphics Center