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[209.132.180.67]) by mx.google.com with ESMTP id l7si5477230edv.89.2019.11.28.02.07.05; Thu, 28 Nov 2019 02:07:29 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726622AbfK1KDk (ORCPT + 99 others); Thu, 28 Nov 2019 05:03:40 -0500 Received: from mga03.intel.com ([134.134.136.65]:9956 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726133AbfK1KDk (ORCPT ); Thu, 28 Nov 2019 05:03:40 -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 orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 28 Nov 2019 02:03:38 -0800 X-IronPort-AV: E=Sophos;i="5.69,253,1571727600"; d="scan'208";a="203389544" Received: from jnikula-mobl3.fi.intel.com (HELO localhost) ([10.237.66.161]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 28 Nov 2019 02:03:34 -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: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Benjamin Gaignard Subject: Re: [PATCH] drm/dp_mst: Fix W=1 warnings In-Reply-To: <20191112123938.2346-1-benjamin.gaignard@st.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20191112123938.2346-1-benjamin.gaignard@st.com> Date: Thu, 28 Nov 2019 12:03:32 +0200 Message-ID: <877e3knwqz.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 Tue, 12 Nov 2019, Benjamin Gaignard wrote: > Fix the warnings that show up with W=1. > They are all about unused but set variables. > > Signed-off-by: Benjamin Gaignard > --- > drivers/gpu/drm/drm_dp_mst_topology.c | 50 +++++++++++++---------------------- > 1 file changed, 19 insertions(+), 31 deletions(-) > > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index b854a422a523..6ff554be8000 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -672,7 +672,6 @@ 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; > @@ -714,8 +713,6 @@ 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); Someone who knows this code really needs to check if we should be using crc4 instead of just throwing this away as unused. > /* copy chunk into bigger msg */ > memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1); > msg->curlen += msg->curchunk_len - 1; > @@ -1744,14 +1741,13 @@ 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) The function changed in c485e2c97dae ("drm/dp_mst: Refactor pdt setup/teardown, add more locking"). > { > - 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); > @@ -1821,21 +1817,18 @@ 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( > + drm_dp_send_dpcd_write( > mstb->mgr, > mstb->port_parent, > DP_GUID, > 16, > mstb->guid); Indentation could be fixed while at it. > } else { > - > - ret = drm_dp_dpcd_write( > + drm_dp_dpcd_write( > mstb->mgr->aux, > DP_GUID, > mstb->guid, > @@ -2427,14 +2420,14 @@ 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); Maybe you should make the function void while at it? > > mstb->link_address_sent = true; > drm_dp_queue_down_tx(mgr, txmsg); > @@ -2476,7 +2469,6 @@ 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); > @@ -2484,7 +2476,7 @@ 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); Maybe you should make the function void while at it? > drm_dp_queue_down_tx(mgr, txmsg); > > @@ -2567,7 +2559,7 @@ 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; > > @@ -2592,9 +2584,9 @@ 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); Maybe you should make the function void while at it? > > drm_dp_queue_down_tx(mgr, txmsg); > > @@ -2623,7 +2615,7 @@ 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) > @@ -2636,7 +2628,7 @@ 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); Maybe you should make the function void while at it? > drm_dp_queue_down_tx(mgr, txmsg); > > ret = drm_dp_mst_wait_tx_reply(port->parent, txmsg); > @@ -2856,7 +2848,6 @@ 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; > @@ -2871,7 +2862,7 @@ 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); Maybe you should make the function void while at it? > txmsg->dst = port->parent; > > drm_dp_queue_down_tx(mgr, txmsg); > @@ -2909,7 +2900,6 @@ 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; > @@ -2924,7 +2914,7 @@ 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); Maybe you should make the function void while at it? > txmsg->dst = mstb; > > drm_dp_queue_down_tx(mgr, txmsg); > @@ -3147,7 +3137,7 @@ 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; > @@ -3167,7 +3157,6 @@ 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) { > @@ -3959,17 +3948,16 @@ 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