Re: [PATCH v2] drm/dp_mst: Fix W=1 warnings

From: Benjamin GAIGNARD
Date: Thu Nov 28 2019 - 08:27:10 EST

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In reply to: Jani Nikula: "Re: [PATCH v2] drm/dp_mst: Fix W=1 warnings"
Next in thread: Jani Nikula: "Re: [PATCH v2] drm/dp_mst: Fix W=1 warnings"
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On 11/28/19 12:21 PM, Jani Nikula wrote:
> On Thu, 28 Nov 2019, Benjamin Gaignard <benjamin.gaignard@xxxxxx> 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 <benjamin.gaignard@xxxxxx>
>> CC: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
>> ---
>> changes in version 2:
>> - fix indentations
>> - when possible change functions prototype to void
>>
>> Note: this patch may conflict with c485e2c97dae ("drm/dp_mst: Refactor pdt
>> setup/teardown, add more locking") when it will hit drm-misc-next
> Well, why create an unnecessary conflict when the referenced commit also
> fixes the same warnings as a side-effect?

Because this commit is not merged (yet ?) in drm-misc-next which where I
start.

Benjamin

> BR,
> Jani.
>
>
>> 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 b854a422a523..ff2d81db0778 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);
>> /* copy chunk into bigger msg */
>> memcpy(&msg->msg[msg->curlen], msg->chunk, msg->curchunk_len - 1);
>> msg->curlen += msg->curchunk_len - 1;
>> @@ -1012,7 +1009,7 @@ 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;
>>
>> @@ -1022,17 +1019,14 @@ 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)
>> @@ -1046,7 +1040,7 @@ 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)
>> @@ -1062,10 +1056,9 @@ 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;
>> @@ -1078,7 +1071,6 @@ 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,
>> @@ -1744,14 +1736,13 @@ 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);
>> @@ -1821,25 +1812,20 @@ 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);
>> }
>> }
>> }
>> @@ -2195,7 +2181,7 @@ 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;
>>
>> @@ -2204,8 +2190,6 @@ 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,
>> @@ -2427,14 +2411,14 @@ 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);
>> @@ -2476,7 +2460,6 @@ 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 +2467,7 @@ 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);
>>
>> @@ -2567,7 +2550,7 @@ 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 +2575,9 @@ 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);
>>
>> @@ -2623,7 +2606,7 @@ 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 +2619,7 @@ 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);
>> @@ -2856,7 +2839,6 @@ 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 +2853,7 @@ 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);
>> @@ -2909,7 +2891,6 @@ 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 +2905,7 @@ 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);
>> @@ -3147,7 +3128,7 @@ 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 +3148,6 @@ 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 +3939,16 @@ 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]);

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In reply to: Jani Nikula: "Re: [PATCH v2] drm/dp_mst: Fix W=1 warnings"
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