Re: [PATCH v2 2/2] drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP bridge driver
From: Dan Carpenter
Date: Tue Oct 15 2019 - 05:20:11 EST
[ These are automated text from the 0-day bot -dan ]
Hi Xin,
Thank you for the patch! Perhaps something to improve:
url: https://github.com/0day-ci/linux/commits/Xin-Ji/dt-bindings-drm-bridge-anx7625-MIPI-to-DP-transmitter-binding/20191014-043019
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
New smatch warnings:
drivers/gpu/drm/bridge/analogix/anx7625.c:1274 anx7625_start_dp_work() error: uninitialized symbol 'sp_tx_lane_count'.
# https://github.com/0day-ci/linux/commit/152a82b6747f10d6c13c7a422173947c2f2e1aa2
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 152a82b6747f10d6c13c7a422173947c2f2e1aa2
vim +/sp_tx_lane_count +1274 drivers/gpu/drm/bridge/analogix/anx7625.c
152a82b6747f10 Xin Ji 2019-10-11 1253 static void anx7625_start_dp_work(struct anx7625_data *ctx)
152a82b6747f10 Xin Ji 2019-10-11 1254 {
152a82b6747f10 Xin Ji 2019-10-11 1255 int ret;
152a82b6747f10 Xin Ji 2019-10-11 1256 u8 buf[MAX_DPCD_BUFFER_SIZE];
152a82b6747f10 Xin Ji 2019-10-11 1257 u8 hdcp_cap;
152a82b6747f10 Xin Ji 2019-10-11 1258 struct device *dev = &ctx->client->dev;
152a82b6747f10 Xin Ji 2019-10-11 1259 u8 sp_tx_bw; /* linktraining banwidth */
152a82b6747f10 Xin Ji 2019-10-11 1260 u8 sp_tx_lane_count; /* link training lane count */
152a82b6747f10 Xin Ji 2019-10-11 1261
152a82b6747f10 Xin Ji 2019-10-11 1262 if (ctx->hpd_high_cnt >= 2) {
152a82b6747f10 Xin Ji 2019-10-11 1263 DRM_DEV_DEBUG_DRIVER(dev, "anx7625 filter useless HPD\n");
152a82b6747f10 Xin Ji 2019-10-11 1264 return;
152a82b6747f10 Xin Ji 2019-10-11 1265 }
152a82b6747f10 Xin Ji 2019-10-11 1266
152a82b6747f10 Xin Ji 2019-10-11 1267 ctx->hpd_high_cnt++;
152a82b6747f10 Xin Ji 2019-10-11 1268
152a82b6747f10 Xin Ji 2019-10-11 1269 sp_tx_get_rx_bw(ctx, &sp_tx_bw);
152a82b6747f10 Xin Ji 2019-10-11 1270
152a82b6747f10 Xin Ji 2019-10-11 1271 sp_tx_aux_dpcdread_bytes(ctx, 0x00, 0x00, DPCD_MAX_LANE_COUNT,
152a82b6747f10 Xin Ji 2019-10-11 1272 1, &sp_tx_lane_count);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Smatch thinks sp_tx_aux_dpcdread_bytes() can fail and we don't check
for errors.
152a82b6747f10 Xin Ji 2019-10-11 1273
152a82b6747f10 Xin Ji 2019-10-11 @1274 sp_tx_lane_count = sp_tx_lane_count & 0x1f;
152a82b6747f10 Xin Ji 2019-10-11 1275 sp_tx_aux_dpcdread_bytes(ctx, 0x06, 0x80, 0x28, 1, buf);/* read Bcap */
152a82b6747f10 Xin Ji 2019-10-11 1276
152a82b6747f10 Xin Ji 2019-10-11 1277 hdcp_cap = buf[0] & 0x01;
152a82b6747f10 Xin Ji 2019-10-11 1278
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