Hello Mikko Perttunen,
The patch 46f226c93d35: "drm/tegra: Add NVDEC driver" from Sep 16,
2021, leads to the following Smatch static checker warning:
drivers/gpu/drm/tegra/nvdec.c:282 nvdec_load_falcon_firmware()
error: uninitialized symbol 'iova'.
drivers/gpu/drm/tegra/nvdec.c
253 static int nvdec_load_falcon_firmware(struct nvdec *nvdec)
254 {
255 struct host1x_client *client = &nvdec->client.base;
256 struct tegra_drm *tegra = nvdec->client.drm;
257 dma_addr_t iova;
258 size_t size;
259 void *virt;
260 int err;
261
262 if (nvdec->falcon.firmware.virt)
263 return 0;
264
265 err = falcon_read_firmware(&nvdec->falcon, nvdec->config->firmware);
266 if (err < 0)
267 return err;
268
269 size = nvdec->falcon.firmware.size;
270
271 if (!client->group) {
272 virt = dma_alloc_coherent(nvdec->dev, size, &iova, GFP_KERNEL);
273
274 err = dma_mapping_error(nvdec->dev, iova);
275 if (err < 0)
276 return err;
277 } else {
278 virt = tegra_drm_alloc(tegra, size, &iova);
^^^^
Needs an if (IS_ERR(virt)) {
No idea why this warning is only just showing up now after two years...
279 }
280
281 nvdec->falcon.firmware.virt = virt;
--> 282 nvdec->falcon.firmware.iova = iova;
283
regards,
dan carpenter
