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2024-01-04 1543e317f1da31b75942316931e8f491a8920811 
 kernel/drivers/media/dvb-core/dvb_frontend.c
....@@ -1,6 +1,6 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * dvb_frontend.c: DVB frontend tuning interface/thread
3
- *
44  *
55  * Copyright (C) 1999-2001 Ralph  Metzler
66  *			   Marcus Metzler
....@@ -8,18 +8,6 @@
88  *				      for convergence integrated media GmbH
99  *
1010  * Copyright (C) 2004 Andrew de Quincey (tuning thread cleanup)
11
- *
12
- * This program is free software; you can redistribute it and/or
13
- * modify it under the terms of the GNU General Public License
14
- * as published by the Free Software Foundation; either version 2
15
- * of the License, or (at your option) any later version.
16
- *
17
- * This program is distributed in the hope that it will be useful,
18
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
19
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
20
- * GNU General Public License for more details.
21
- * To obtain the license, point your browser to
22
- * http://www.gnu.org/copyleft/gpl.html
2311  */
2412 
2513 /* Enables DVBv3 compatibility bits at the headers */
....@@ -147,7 +135,7 @@
147135 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
148136 
149137 	if (fepriv)
150
-		dvb_free_device(fepriv->dvbdev);
138
+		dvb_device_put(fepriv->dvbdev);
151139 
152140 	dvb_frontend_invoke_release(fe, fe->ops.release);
153141 
....@@ -304,14 +292,22 @@
304292 	}
305293 
306294 	if (events->eventw == events->eventr) {
307
-		int ret;
295
+		struct wait_queue_entry wait;
296
+		int ret = 0;
308297 
309298 		if (flags & O_NONBLOCK)
310299 			return -EWOULDBLOCK;
311300 
312
-		ret = wait_event_interruptible(events->wait_queue,
313
-					       dvb_frontend_test_event(fepriv, events));
314
-
301
+		init_waitqueue_entry(&wait, current);
302
+		add_wait_queue(&events->wait_queue, &wait);
303
+		while (!dvb_frontend_test_event(fepriv, events)) {
304
+			wait_woken(&wait, TASK_INTERRUPTIBLE, 0);
305
+			if (signal_pending(current)) {
306
+				ret = -ERESTARTSYS;
307
+				break;
308
+			}
309
+		}
310
+		remove_wait_queue(&events->wait_queue, &wait);
315311 		if (ret < 0)
316312 			return ret;
317313 	}
....@@ -919,6 +915,9 @@
919915 		dev_warn(fe->dvb->device,
920916 			 "DVB: adapter %i frontend %u frequency limits undefined - fix the driver\n",
921917 			 fe->dvb->num, fe->id);
918
+
919
+	dev_dbg(fe->dvb->device, "frequency interval: tuner: %u...%u, frontend: %u...%u",
920
+		tuner_min, tuner_max, frontend_min, frontend_max);
922921 
923922 	/* If the standard is for satellite, convert frequencies to kHz */
924923 	switch (c->delivery_system) {
....@@ -1596,7 +1595,7 @@
15961595  *
15971596  * Provides emulation for delivery systems that are compatible with the old
15981597  * DVBv3 call. Among its usages, it provices support for ISDB-T, and allows
1599
- * using a DVB-S2 only frontend just like it were a DVB-S, if the frontent
1598
+ * using a DVB-S2 only frontend just like it were a DVB-S, if the frontend
16001599  * parameters are compatible with DVB-S spec.
16011600  */
16021601 static int emulate_delivery_system(struct dvb_frontend *fe, u32 delsys)
....@@ -2323,6 +2322,78 @@
23232322 	return 0;
23242323 }
23252324 
2325
+static int dvb_get_property(struct dvb_frontend *fe, struct file *file,
2326
+			    struct dtv_properties *tvps)
2327
+{
2328
+	struct dvb_frontend_private *fepriv = fe->frontend_priv;
2329
+	struct dtv_property *tvp = NULL;
2330
+	struct dtv_frontend_properties getp;
2331
+	int i, err;
2332
+
2333
+	memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2334
+
2335
+	dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2336
+		__func__, tvps->num);
2337
+	dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2338
+		__func__, tvps->props);
2339
+
2340
+	/*
2341
+	 * Put an arbitrary limit on the number of messages that can
2342
+	 * be sent at once
2343
+	 */
2344
+	if (!tvps->num || tvps->num > DTV_IOCTL_MAX_MSGS)
2345
+		return -EINVAL;
2346
+
2347
+	tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2348
+	if (IS_ERR(tvp))
2349
+		return PTR_ERR(tvp);
2350
+
2351
+	/*
2352
+	 * Let's use our own copy of property cache, in order to
2353
+	 * avoid mangling with DTV zigzag logic, as drivers might
2354
+	 * return crap, if they don't check if the data is available
2355
+	 * before updating the properties cache.
2356
+	 */
2357
+	if (fepriv->state != FESTATE_IDLE) {
2358
+		err = dtv_get_frontend(fe, &getp, NULL);
2359
+		if (err < 0)
2360
+			goto out;
2361
+	}
2362
+	for (i = 0; i < tvps->num; i++) {
2363
+		err = dtv_property_process_get(fe, &getp,
2364
+					       tvp + i, file);
2365
+		if (err < 0)
2366
+			goto out;
2367
+	}
2368
+
2369
+	if (copy_to_user((void __user *)tvps->props, tvp,
2370
+			 tvps->num * sizeof(struct dtv_property))) {
2371
+		err = -EFAULT;
2372
+		goto out;
2373
+	}
2374
+
2375
+	err = 0;
2376
+out:
2377
+	kfree(tvp);
2378
+	return err;
2379
+}
2380
+
2381
+static int dvb_get_frontend(struct dvb_frontend *fe,
2382
+			    struct dvb_frontend_parameters *p_out)
2383
+{
2384
+	struct dtv_frontend_properties getp;
2385
+
2386
+	/*
2387
+	 * Let's use our own copy of property cache, in order to
2388
+	 * avoid mangling with DTV zigzag logic, as drivers might
2389
+	 * return crap, if they don't check if the data is available
2390
+	 * before updating the properties cache.
2391
+	 */
2392
+	memcpy(&getp, &fe->dtv_property_cache, sizeof(getp));
2393
+
2394
+	return dtv_get_frontend(fe, &getp, p_out);
2395
+}
2396
+
23262397 static int dvb_frontend_handle_ioctl(struct file *file,
23272398 				     unsigned int cmd, void *parg)
23282399 {
....@@ -2368,64 +2439,15 @@
23682439 		err = 0;
23692440 		break;
23702441 	}
2371
-	case FE_GET_PROPERTY: {
2372
-		struct dtv_properties *tvps = parg;
2373
-		struct dtv_property *tvp = NULL;
2374
-		struct dtv_frontend_properties getp = fe->dtv_property_cache;
2375
-
2376
-		dev_dbg(fe->dvb->device, "%s: properties.num = %d\n",
2377
-			__func__, tvps->num);
2378
-		dev_dbg(fe->dvb->device, "%s: properties.props = %p\n",
2379
-			__func__, tvps->props);
2380
-
2381
-		/*
2382
-		 * Put an arbitrary limit on the number of messages that can
2383
-		 * be sent at once
2384
-		 */
2385
-		if (!tvps->num || (tvps->num > DTV_IOCTL_MAX_MSGS))
2386
-			return -EINVAL;
2387
-
2388
-		tvp = memdup_user((void __user *)tvps->props, tvps->num * sizeof(*tvp));
2389
-		if (IS_ERR(tvp))
2390
-			return PTR_ERR(tvp);
2391
-
2392
-		/*
2393
-		 * Let's use our own copy of property cache, in order to
2394
-		 * avoid mangling with DTV zigzag logic, as drivers might
2395
-		 * return crap, if they don't check if the data is available
2396
-		 * before updating the properties cache.
2397
-		 */
2398
-		if (fepriv->state != FESTATE_IDLE) {
2399
-			err = dtv_get_frontend(fe, &getp, NULL);
2400
-			if (err < 0) {
2401
-				kfree(tvp);
2402
-				return err;
2403
-			}
2404
-		}
2405
-		for (i = 0; i < tvps->num; i++) {
2406
-			err = dtv_property_process_get(fe, &getp,
2407
-						       tvp + i, file);
2408
-			if (err < 0) {
2409
-				kfree(tvp);
2410
-				return err;
2411
-			}
2412
-		}
2413
-
2414
-		if (copy_to_user((void __user *)tvps->props, tvp,
2415
-				 tvps->num * sizeof(struct dtv_property))) {
2416
-			kfree(tvp);
2417
-			return -EFAULT;
2418
-		}
2419
-		kfree(tvp);
2420
-		err = 0;
2442
+	case FE_GET_PROPERTY:
2443
+		err = dvb_get_property(fe, file, parg);
24212444 		break;
2422
-	}
24232445 
24242446 	case FE_GET_INFO: {
24252447 		struct dvb_frontend_info *info = parg;
24262448 		memset(info, 0, sizeof(*info));
24272449 
2428
-		strcpy(info->name, fe->ops.info.name);
2450
+		strscpy(info->name, fe->ops.info.name, sizeof(info->name));
24292451 		info->symbol_rate_min = fe->ops.info.symbol_rate_min;
24302452 		info->symbol_rate_max = fe->ops.info.symbol_rate_max;
24312453 		info->symbol_rate_tolerance = fe->ops.info.symbol_rate_tolerance;
....@@ -2557,7 +2579,6 @@
25572579 		fepriv->tune_mode_flags = (unsigned long)parg;
25582580 		err = 0;
25592581 		break;
2560
-
25612582 	/* DEPRECATED dish control ioctls */
25622583 
25632584 	case FE_DISHNETWORK_SEND_LEGACY_CMD:
....@@ -2590,8 +2611,8 @@
25902611 			u8 last = 1;
25912612 
25922613 			if (dvb_frontend_debug)
2593
-				dprintk("%s switch command: 0x%04lx\n",
2594
-					__func__, swcmd);
2614
+				dprintk("switch command: 0x%04lx\n",
2615
+					swcmd);
25952616 			nexttime = ktime_get_boottime();
25962617 			if (dvb_frontend_debug)
25972618 				tv[0] = nexttime;
....@@ -2614,8 +2635,8 @@
26142635 					dvb_frontend_sleep_until(&nexttime, 8000);
26152636 			}
26162637 			if (dvb_frontend_debug) {
2617
-				dprintk("%s(%d): switch delay (should be 32k followed by all 8k)\n",
2618
-					__func__, fe->dvb->num);
2638
+				dprintk("(adapter %d): switch delay (should be 32k followed by all 8k)\n",
2639
+					fe->dvb->num);
26192640 				for (i = 1; i < 10; i++)
26202641 					pr_info("%d: %d\n", i,
26212642 						(int)ktime_us_delta(tv[i], tv[i - 1]));
....@@ -2676,22 +2697,14 @@
26762697 			break;
26772698 		err = dtv_set_frontend(fe);
26782699 		break;
2700
+
26792701 	case FE_GET_EVENT:
26802702 		err = dvb_frontend_get_event(fe, parg, file->f_flags);
26812703 		break;
26822704 
2683
-	case FE_GET_FRONTEND: {
2684
-		struct dtv_frontend_properties getp = fe->dtv_property_cache;
2685
-
2686
-		/*
2687
-		 * Let's use our own copy of property cache, in order to
2688
-		 * avoid mangling with DTV zigzag logic, as drivers might
2689
-		 * return crap, if they don't check if the data is available
2690
-		 * before updating the properties cache.
2691
-		 */
2692
-		err = dtv_get_frontend(fe, &getp, parg);
2705
+	case FE_GET_FRONTEND:
2706
+		err = dvb_get_frontend(fe, parg);
26932707 		break;
2694
-	}
26952708 
26962709 	default:
26972710 		return -ENOTSUPP;
....@@ -2956,6 +2969,7 @@
29562969 		.name = fe->ops.info.name,
29572970 #endif
29582971 	};
2972
+	int ret;
29592973 
29602974 	dev_dbg(dvb->device, "%s:\n", __func__);
29612975 
....@@ -2989,8 +3003,13 @@
29893003 		 "DVB: registering adapter %i frontend %i (%s)...\n",
29903004 		 fe->dvb->num, fe->id, fe->ops.info.name);
29913005 
2992
-	dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
3006
+	ret = dvb_register_device(fe->dvb, &fepriv->dvbdev, &dvbdev_template,
29933007 			    fe, DVB_DEVICE_FRONTEND, 0);
3008
+	if (ret) {
3009
+		dvb_frontend_put(fe);
3010
+		mutex_unlock(&frontend_mutex);
3011
+		return ret;
3012
+	}
29943013 
29953014 	/*
29963015 	 * Initialize the cache to the proper values according with the