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Message-ID: <20200622113757.GB4151@kadam>
Date: Mon, 22 Jun 2020 14:37:57 +0300
From: Dan Carpenter <dan.carpenter@...cle.com>
To: kbuild@...ts.01.org,
Amireddy Mallikarjuna reddy
<mallikarjunax.reddy@...ux.intel.com>, dmaengine@...r.kernel.org,
vkoul@...nel.org, devicetree@...r.kernel.org, robh+dt@...nel.org
Cc: lkp@...el.com, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org, andriy.shevchenko@...el.com,
chuanhua.lei@...ux.intel.com, cheol.yong.kim@...el.com,
qi-ming.wu@...el.com, malliamireddy009@...il.com
Subject: Re: [PATCH 2/2] Add Intel LGM soc DMA support.
Hi Amireddy,
url: https://github.com/0day-ci/linux/commits/Amireddy-Mallikarjuna-reddy/Add-Intel-LGM-soc-DMA-support/20200610-202116
base: https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: i386-randconfig-m021-20200621 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
smatch warnings:
drivers/dma/lgm/lgm-dma.c:1306 ldma_cfg_init() error: uninitialized symbol 'ret'.
# https://github.com/0day-ci/linux/commit/23493bf02c8f7255c8ff22b02f42f0adccb8e8ad
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout 23493bf02c8f7255c8ff22b02f42f0adccb8e8ad
vim +/ret +1306 drivers/dma/lgm/lgm-dma.c
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1198 static int ldma_cfg_init(struct ldma_dev *d)
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1199 {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1200 struct fwnode_handle *fwnode = dev_fwnode(d->dev);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1201 struct fwnode_handle *fw_chans, *fw_chan;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1202 struct fwnode_handle *fw_ports, *fw_port;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1203 struct ldma_chan *c;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1204 struct ldma_port *p;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1205 u32 txendi, rxendi;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1206 u32 prop, val;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1207 int ret, i;
^^^^^^^
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1208
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1209 if (fwnode_property_read_bool(fwnode, "intel,dma-chan-fc"))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1210 d->flags |= DMA_CHAN_FLOW_CTL;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1211
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1212 if (fwnode_property_read_bool(fwnode, "intel,dma-desc-fod"))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1213 d->flags |= DMA_DESC_FTOD;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1214
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1215 if (fwnode_property_read_bool(fwnode, "intel,dma-desc-in-sram"))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1216 d->flags |= DMA_DESC_IN_SRAM;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1217
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1218 if (fwnode_property_read_bool(fwnode, "intel,dma-byte-en"))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1219 d->flags |= DMA_EN_BYTE_EN;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1220
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1221 if (fwnode_property_read_bool(fwnode, "intel,dma-dfetch-ack"))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1222 d->flags |= DMA_VLD_FETCH_ACK;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1223
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1224 if (fwnode_property_read_bool(fwnode, "intel,dma-dburst-wr"))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1225 d->flags |= DMA_DBURST_WR;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1226
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1227 if (fwnode_property_read_bool(fwnode, "intel,dma-drb"))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1228 d->flags |= DMA_DFT_DRB;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1229
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1230 if (fwnode_property_read_u32(fwnode, "intel,dma-polling-cnt",
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1231 &d->pollcnt))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1232 d->pollcnt = DMA_DFT_POLL_CNT;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1233
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1234 if (!fwnode_property_read_u32(fwnode, "intel,dma-orrc", &val)) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1235 if (val > DMA_ORRC_MAX_CNT)
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1236 return -EINVAL;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1237 d->orrc = val;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1238 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1239
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1240 if (d->ver > DMA_VER22) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1241 if (fwnode_property_read_u32(fwnode, "intel,dma-txendi",
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1242 &txendi))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1243 txendi = DMA_DFT_ENDIAN;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1244
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1245 if (fwnode_property_read_u32(fwnode, "intel,dma-rxendi",
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1246 &rxendi))
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1247 rxendi = DMA_DFT_ENDIAN;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1248
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1249 if (!d->port_nrs)
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1250 return -EINVAL;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1251
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1252 for (i = 0; i < d->port_nrs; i++) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1253 p = &d->ports[i];
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1254 p->rxendi = rxendi;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1255 p->txendi = txendi;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1256
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1257 if (!fwnode_property_read_u32(fwnode, "intel,dma-burst",
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1258 &prop)) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1259 p->rxbl = prop;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1260 p->txbl = prop;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1261 } else {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1262 p->rxbl = DMA_DFT_BURST;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1263 p->txbl = DMA_DFT_BURST;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1264 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1265
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1266 p->pkt_drop = DMA_PKT_DROP_DIS;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1267 p->flush_memcpy = 0;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1268 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1269 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1270
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1271 /* Port specific, required for dma0 */
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1272 fw_ports = fwnode_get_named_child_node(fwnode, "dma,ports");
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1273 if (!fw_ports && d->ver == DMA_VER22) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1274 dev_err(d->dev, "Failed to get ports settings\n");
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1275 return -ENODEV;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1276 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1277 if (fw_ports) {
^^^^^^^
"ret" is not initialized if fw_ports is false.
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1278 fwnode_for_each_child_node(fw_ports, fw_port) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1279 ret = dma_parse_port_dt(fw_port, d);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1280 if (ret) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1281 fwnode_handle_put(fw_port);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1282 fwnode_handle_put(fw_ports);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1283 return -EINVAL;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1284 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1285 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1286 fwnode_handle_put(fw_ports);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1287 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1288
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1289 d->chans = devm_kcalloc(d->dev, d->chan_nrs, sizeof(*c), GFP_KERNEL);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1290 if (!d->chans)
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1291 return -ENOMEM;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1292
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1293 /* Channel based configuration if available, optional */
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1294 fw_chans = fwnode_get_named_child_node(fwnode, "dma,channels");
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1295 if (fw_chans) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1296 fwnode_for_each_child_node(fw_chans, fw_chan) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1297 if (dma_parse_chan_dt(fw_chan, d)) {
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1298 fwnode_handle_put(fw_chan);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1299 fwnode_handle_put(fw_chans);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1300 return -EINVAL;
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1301 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1302 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1303 fwnode_handle_put(fw_chans);
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1304 }
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1305
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 @1306 return ret;
^^^^^^^^^^
It's more readable to return a literal. "return 0;".
23493bf02c8f72 Amireddy Mallikarjuna reddy 2020-06-10 1307 }
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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