diff mbox series

drm/dp_mst: Fix W=1 warnings

Message ID 20191112123938.2346-1-benjamin.gaignard@st.com (mailing list archive)
State New, archived
Headers show
Series drm/dp_mst: Fix W=1 warnings | expand

Commit Message

Benjamin GAIGNARD Nov. 12, 2019, 12:39 p.m. UTC
Fix the warnings that show up with W=1.
They are all about unused but set variables.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
---
 drivers/gpu/drm/drm_dp_mst_topology.c | 50 +++++++++++++----------------------
 1 file changed, 19 insertions(+), 31 deletions(-)

Comments

Benjamin Gaignard Nov. 27, 2019, 10:23 a.m. UTC | #1
Le mer. 13 nov. 2019 à 08:55, Benjamin Gaignard
<benjamin.gaignard@st.com> a écrit :
>
> Fix the warnings that show up with W=1.
> They are all about unused but set variables.

gentle ping to reviewers,

Thanks,
Benjamin
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> ---
>  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);
>                 /* 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)
>  {
> -       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);
>                 } 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);
>
>         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);
>
>         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);
>
>         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);
>         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);
>         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);
>         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]);
> --
> 2.15.0
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
Jani Nikula Nov. 28, 2019, 10:03 a.m. UTC | #2
On Tue, 12 Nov 2019, Benjamin Gaignard <benjamin.gaignard@st.com> wrote:
> Fix the warnings that show up with W=1.
> They are all about unused but set variables.
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
> ---
>  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]);
diff mbox series

Patch

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);
 		/* 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)
 {
-	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);
 		} 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);
 
 	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);
 
 	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);
 
 	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);
 	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);
 	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);
 	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]);