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Message-ID: <201708130619.vuq0fThc%fengguang.wu@intel.com>
Date: Sun, 13 Aug 2017 06:32:09 +0800
From: kbuild test robot <lkp@...el.com>
To: "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>
Cc: kbuild-all@...org, Michael Krufky <mkrufky@...uxtv.org>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Andy Walls <awalls@...metrocast.net>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-media@...r.kernel.org
Subject: Re: [PATCH 5/5] [media] cxusb: add analog mode support for Medion
MD95700
Hi Maciej,
[auto build test WARNING on linuxtv-media/master]
[also build test WARNING on v4.13-rc4 next-20170811]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Maciej-S-Szmigiero/Add-analog-mode-support-for-Medion-MD95700/20170813-041742
base: git://linuxtv.org/media_tree.git master
reproduce:
# apt-get install sparse
make ARCH=x86_64 allmodconfig
make C=1 CF=-D__CHECK_ENDIAN__
sparse warnings: (new ones prefixed by >>)
vim +359 drivers/media/usb/dvb-usb/cxusb-analog.c
198
199 static bool cxusb_medion_copy_field(struct dvb_usb_device *dvbdev,
200 struct cxusb_medion_auxbuf *auxbuf,
201 struct cxusb_bt656_params *bt656,
202 bool firstfield,
203 unsigned int maxlines,
204 unsigned int maxlinesamples)
205 {
206 while (bt656->line < maxlines &&
207 !cxusb_auxbuf_isend(auxbuf, bt656->pos)) {
208
209 unsigned char val;
210
211 if (!cxusb_auxbuf_copy(auxbuf, bt656->pos, &val, 1))
212 return false;
213
214 if ((char)val == CXUSB_BT656_COMMON[0]) {
215 char buf[3];
216
217 if (!cxusb_auxbuf_copy(auxbuf, bt656->pos + 1,
218 buf, 3))
219 return false;
220
221 if (buf[0] != (CXUSB_BT656_COMMON)[1] ||
222 buf[1] != (CXUSB_BT656_COMMON)[2])
223 goto normal_sample;
224
225 if (bt656->line != 0 && (!!firstfield !=
226 ((buf[2] & CXUSB_FIELD_MASK)
227 == CXUSB_FIELD_1))) {
228 if (bt656->fmode == LINE_SAMPLES) {
229 cxusb_vprintk(dvbdev, BT656,
230 "field %c after line %u field change\n",
231 firstfield ? '1' : '2',
232 bt656->line);
233
234 if (bt656->buf != NULL &&
235 maxlinesamples -
236 bt656->linesamples > 0) {
237
238 memset(bt656->buf, 0,
239 maxlinesamples -
240 bt656->linesamples);
241
242 bt656->buf +=
243 maxlinesamples -
244 bt656->linesamples;
245
246 cxusb_vprintk(dvbdev, BT656,
247 "field %c line %u %u samples still remaining (of %u)\n",
248 firstfield ?
249 '1' : '2',
250 bt656->line,
251 maxlinesamples -
252 bt656->
253 linesamples,
254 maxlinesamples);
255 }
256
257 bt656->line++;
258 }
259
260 if (maxlines - bt656->line > 0 &&
261 bt656->buf != NULL) {
262 memset(bt656->buf, 0,
263 (maxlines - bt656->line)
264 * maxlinesamples);
265
266 bt656->buf +=
267 (maxlines - bt656->line)
268 * maxlinesamples;
269
270 cxusb_vprintk(dvbdev, BT656,
271 "field %c %u lines still remaining (of %u)\n",
272 firstfield ? '1' : '2',
273 maxlines - bt656->line,
274 maxlines);
275 }
276
277 return true;
278 }
279
280 if (bt656->fmode == START_SEARCH) {
281 if ((buf[2] & CXUSB_SEAV_MASK) ==
282 CXUSB_SEAV_SAV &&
283 (!!firstfield == ((buf[2] &
284 CXUSB_FIELD_MASK)
285 == CXUSB_FIELD_1))) {
286
287 if ((buf[2] & CXUSB_VBI_MASK) ==
288 CXUSB_VBI_OFF) {
289 cxusb_vprintk(dvbdev,
290 BT656,
291 "line start @ pos %x\n",
292 bt656->pos);
293
294 bt656->linesamples = 0;
295 bt656->fmode = LINE_SAMPLES;
296 } else {
297 cxusb_vprintk(dvbdev,
298 BT656,
299 "VBI start @ pos %x\n",
300 bt656->pos);
301
302 bt656->fmode = VBI_SAMPLES;
303 }
304 }
305
306 bt656->pos =
307 cxusb_auxbuf_advance(auxbuf,
308 bt656->pos, 4);
309 continue;
310 } else if (bt656->fmode == LINE_SAMPLES) {
311 if ((buf[2] & CXUSB_SEAV_MASK) ==
312 CXUSB_SEAV_SAV)
313 cxusb_vprintk(dvbdev, BT656,
314 "SAV in line samples @ line %u, pos %x\n",
315 bt656->line, bt656->pos);
316
317 if (bt656->buf != NULL && maxlinesamples -
318 bt656->linesamples > 0) {
319
320 memset(bt656->buf, 0,
321 maxlinesamples -
322 bt656->linesamples);
323 bt656->buf += maxlinesamples -
324 bt656->linesamples;
325
326 cxusb_vprintk(dvbdev, BT656,
327 "field %c line %u %u samples still remaining (of %u)\n",
328 firstfield ? '1' : '2',
329 bt656->line,
330 maxlinesamples -
331 bt656->linesamples,
332 maxlinesamples);
333 }
334
335
336 bt656->fmode = START_SEARCH;
337 bt656->line++;
338 continue;
339 } else if (bt656->fmode == VBI_SAMPLES) {
340 if ((buf[2] & CXUSB_SEAV_MASK) ==
341 CXUSB_SEAV_SAV)
342 cxusb_vprintk(dvbdev, BT656,
343 "SAV in VBI samples @ pos %x\n",
344 bt656->pos);
345
346 bt656->fmode = START_SEARCH;
347 continue;
348 }
349
350 bt656->pos =
351 cxusb_auxbuf_advance(auxbuf, bt656->pos, 4);
352 continue;
353 }
354
355 normal_sample:
356 if (bt656->fmode == START_SEARCH && bt656->line != 0) {
357 unsigned char buf[64];
358 unsigned int idx;
> 359 unsigned int tocheck = min(sizeof(buf),
360 max(sizeof(buf),
361 maxlinesamples / 4));
362
363 if (!cxusb_auxbuf_copy(auxbuf, bt656->pos + 1,
364 buf, tocheck)) {
365 bt656->pos =
366 cxusb_auxbuf_advance(auxbuf,
367 bt656->pos, 1);
368 continue;
369 }
370
371 for (idx = 0; idx <= tocheck - 3; idx++)
372 if (memcmp(buf + idx, CXUSB_BT656_COMMON, 3)
373 == 0)
374 break;
375
376 if (idx <= tocheck - 3) {
377 bt656->pos =
378 cxusb_auxbuf_advance(auxbuf,
379 bt656->pos, 1);
380 continue;
381 }
382
383 cxusb_vprintk(dvbdev, BT656,
384 "line %u early start, pos %x\n",
385 bt656->line, bt656->pos);
386
387 bt656->linesamples = 0;
388 bt656->fmode = LINE_SAMPLES;
389 continue;
390 } else if (bt656->fmode == LINE_SAMPLES) {
391 if (bt656->buf != NULL)
392 *(bt656->buf++) = val;
393
394 bt656->linesamples++;
395 bt656->pos =
396 cxusb_auxbuf_advance(auxbuf,
397 bt656->pos, 1);
398
399 if (bt656->linesamples >= maxlinesamples) {
400 bt656->fmode = START_SEARCH;
401 bt656->line++;
402 }
403
404 continue;
405 }
406 /* TODO: copy VBI samples */
407
408 bt656->pos =
409 cxusb_auxbuf_advance(auxbuf,
410 bt656->pos, 1);
411 }
412
413 if (bt656->line < maxlines) {
414 cxusb_vprintk(dvbdev, BT656, "end of buffer, pos = %u\n",
415 bt656->pos);
416 return false;
417 }
418
419 return true;
420 }
421
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