Re: [PATCH v3] drm/dp_mst: Fix W=1 warnings

From: Benjamin Gaignard
Date: Fri Dec 20 2019 - 09:03:53 EST

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In reply to: Benjamin Gaignard: "Re: [PATCH v3] drm/dp_mst: Fix W=1 warnings"
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Le lun. 16 dÃc. 2019 Ã 09:28, Benjamin Gaignard
<benjamin.gaignard@xxxxxxxxxx> a Ãcrit :
>
> Le mer. 4 dÃc. 2019 Ã 17:47, Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx> a Ãcrit :
> >
> > 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 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.
>
> Hi Dave,
>

+ Lyude who has been hacking in this code recently

> Your are the original writer of this code, could you tell us if we can drop crc4
> ao if there is something else that I have misunderstood ?
>
> Thanks,
> Benjamin
>
> >
> > 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
> > _______________________________________________
> > dri-devel mailing list
> > dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > https://lists.freedesktop.org/mailman/listinfo/dri-devel

Next message: Aleksa Sarai: "[PATCH v2 0/2] openat2: minor uapi cleanups"
Previous message: Ardelean, Alexandru: "Re: [PATCH] dmaengine: virt-dma: Fix access after free in vcna_complete()"
In reply to: Benjamin Gaignard: "Re: [PATCH v3] drm/dp_mst: Fix W=1 warnings"
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