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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/regulator/core.c
....@@ -222,6 +222,78 @@
222222 	mutex_unlock(&regulator_nesting_mutex);
223223 }
224224 
225
+/**
226
+ * regulator_lock_two - lock two regulators
227
+ * @rdev1:		first regulator
228
+ * @rdev2:		second regulator
229
+ * @ww_ctx:		w/w mutex acquire context
230
+ *
231
+ * Locks both rdevs using the regulator_ww_class.
232
+ */
233
+static void regulator_lock_two(struct regulator_dev *rdev1,
234
+			       struct regulator_dev *rdev2,
235
+			       struct ww_acquire_ctx *ww_ctx)
236
+{
237
+	struct regulator_dev *tmp;
238
+	int ret;
239
+
240
+	ww_acquire_init(ww_ctx, &regulator_ww_class);
241
+
242
+	/* Try to just grab both of them */
243
+	ret = regulator_lock_nested(rdev1, ww_ctx);
244
+	WARN_ON(ret);
245
+	ret = regulator_lock_nested(rdev2, ww_ctx);
246
+	if (ret != -EDEADLOCK) {
247
+		WARN_ON(ret);
248
+		goto exit;
249
+	}
250
+
251
+	while (true) {
252
+		/*
253
+		 * Start of loop: rdev1 was locked and rdev2 was contended.
254
+		 * Need to unlock rdev1, slowly lock rdev2, then try rdev1
255
+		 * again.
256
+		 */
257
+		regulator_unlock(rdev1);
258
+
259
+		ww_mutex_lock_slow(&rdev2->mutex, ww_ctx);
260
+		rdev2->ref_cnt++;
261
+		rdev2->mutex_owner = current;
262
+		ret = regulator_lock_nested(rdev1, ww_ctx);
263
+
264
+		if (ret == -EDEADLOCK) {
265
+			/* More contention; swap which needs to be slow */
266
+			tmp = rdev1;
267
+			rdev1 = rdev2;
268
+			rdev2 = tmp;
269
+		} else {
270
+			WARN_ON(ret);
271
+			break;
272
+		}
273
+	}
274
+
275
+exit:
276
+	ww_acquire_done(ww_ctx);
277
+}
278
+
279
+/**
280
+ * regulator_unlock_two - unlock two regulators
281
+ * @rdev1:		first regulator
282
+ * @rdev2:		second regulator
283
+ * @ww_ctx:		w/w mutex acquire context
284
+ *
285
+ * The inverse of regulator_lock_two().
286
+ */
287
+
288
+static void regulator_unlock_two(struct regulator_dev *rdev1,
289
+				 struct regulator_dev *rdev2,
290
+				 struct ww_acquire_ctx *ww_ctx)
291
+{
292
+	regulator_unlock(rdev2);
293
+	regulator_unlock(rdev1);
294
+	ww_acquire_fini(ww_ctx);
295
+}
296
+
225297 static bool regulator_supply_is_couple(struct regulator_dev *rdev)
226298 {
227299 	struct regulator_dev *c_rdev;
....@@ -349,6 +421,7 @@
349421 			ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
350422 			old_contended_rdev = new_contended_rdev;
351423 			old_contended_rdev->ref_cnt++;
424
+			old_contended_rdev->mutex_owner = current;
352425 		}
353426 
354427 		err = regulator_lock_recursive(rdev,
....@@ -986,7 +1059,7 @@
9861059 		/* get input voltage */
9871060 		input_uV = 0;
9881061 		if (rdev->supply)
989
-			input_uV = regulator_get_voltage(rdev->supply);
1062
+			input_uV = regulator_get_voltage_rdev(rdev->supply->rdev);
9901063 		if (input_uV <= 0)
9911064 			input_uV = rdev->constraints->input_uV;
9921065 		if (input_uV <= 0) {
....@@ -1434,7 +1507,13 @@
14341507 		if (rdev->supply_name && !rdev->supply)
14351508 			return -EPROBE_DEFER;
14361509 
1437
-		if (rdev->supply) {
1510
+		/* If supplying regulator has already been enabled,
1511
+		 * it's not intended to have use_count increment
1512
+		 * when rdev is only boot-on.
1513
+		 */
1514
+		if (rdev->supply &&
1515
+		    (rdev->constraints->always_on ||
1516
+		     !regulator_is_enabled(rdev->supply))) {
14381517 			ret = regulator_enable(rdev->supply);
14391518 			if (ret < 0) {
14401519 				_regulator_put(rdev->supply);
....@@ -1459,8 +1538,8 @@
14591538 
14601539 /**
14611540  * set_supply - set regulator supply regulator
1462
- * @rdev: regulator name
1463
- * @supply_rdev: supply regulator name
1541
+ * @rdev: regulator (locked)
1542
+ * @supply_rdev: supply regulator (locked))
14641543  *
14651544  * Called by platform initialisation code to set the supply regulator for this
14661545  * regulator. This ensures that a regulators supply will also be enabled by the
....@@ -1478,6 +1557,7 @@
14781557 
14791558 	rdev->supply = create_regulator(supply_rdev, &rdev->dev, "SUPPLY");
14801559 	if (rdev->supply == NULL) {
1560
+		module_put(supply_rdev->owner);
14811561 		err = -ENOMEM;
14821562 		return err;
14831563 	}
....@@ -1631,6 +1711,8 @@
16311711 	struct regulator *regulator;
16321712 	int err = 0;
16331713 
1714
+	lockdep_assert_held_once(&rdev->mutex.base);
1715
+
16341716 	if (dev) {
16351717 		char buf[REG_STR_SIZE];
16361718 		int size;
....@@ -1651,16 +1733,14 @@
16511733 
16521734 	regulator = kzalloc(sizeof(*regulator), GFP_KERNEL);
16531735 	if (regulator == NULL) {
1654
-		kfree(supply_name);
1736
+		kfree_const(supply_name);
16551737 		return NULL;
16561738 	}
16571739 
16581740 	regulator->rdev = rdev;
16591741 	regulator->supply_name = supply_name;
16601742 
1661
-	regulator_lock(rdev);
16621743 	list_add(&regulator->list, &rdev->consumer_list);
1663
-	regulator_unlock(rdev);
16641744 
16651745 	if (dev) {
16661746 		regulator->dev = dev;
....@@ -1677,19 +1757,19 @@
16771757 
16781758 	if (err != -EEXIST)
16791759 		regulator->debugfs = debugfs_create_dir(supply_name, rdev->debugfs);
1680
-	if (!regulator->debugfs) {
1760
+	else
1761
+		regulator->debugfs = ERR_PTR(err);
1762
+	if (IS_ERR(regulator->debugfs))
16811763 		rdev_dbg(rdev, "Failed to create debugfs directory\n");
1682
-	} else {
1683
-		debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1684
-				   &regulator->uA_load);
1685
-		debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1686
-				   &regulator->voltage[PM_SUSPEND_ON].min_uV);
1687
-		debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1688
-				   &regulator->voltage[PM_SUSPEND_ON].max_uV);
1689
-		debugfs_create_file("constraint_flags", 0444,
1690
-				    regulator->debugfs, regulator,
1691
-				    &constraint_flags_fops);
1692
-	}
1764
+
1765
+	debugfs_create_u32("uA_load", 0444, regulator->debugfs,
1766
+			   &regulator->uA_load);
1767
+	debugfs_create_u32("min_uV", 0444, regulator->debugfs,
1768
+			   &regulator->voltage[PM_SUSPEND_ON].min_uV);
1769
+	debugfs_create_u32("max_uV", 0444, regulator->debugfs,
1770
+			   &regulator->voltage[PM_SUSPEND_ON].max_uV);
1771
+	debugfs_create_file("constraint_flags", 0444, regulator->debugfs,
1772
+			    regulator, &constraint_flags_fops);
16931773 
16941774 	/*
16951775 	 * Check now if the regulator is an always on regulator - if
....@@ -1781,6 +1861,7 @@
17811861 		node = of_get_regulator(dev, supply);
17821862 		if (node) {
17831863 			r = of_find_regulator_by_node(node);
1864
+			of_node_put(node);
17841865 			if (r)
17851866 				return r;
17861867 
....@@ -1825,6 +1906,7 @@
18251906 {
18261907 	struct regulator_dev *r;
18271908 	struct device *dev = rdev->dev.parent;
1909
+	struct ww_acquire_ctx ww_ctx;
18281910 	int ret = 0;
18291911 
18301912 	/* No supply to resolve? */
....@@ -1891,23 +1973,23 @@
18911973 	 * between rdev->supply null check and setting rdev->supply in
18921974 	 * set_supply() from concurrent tasks.
18931975 	 */
1894
-	regulator_lock(rdev);
1976
+	regulator_lock_two(rdev, r, &ww_ctx);
18951977 
18961978 	/* Supply just resolved by a concurrent task? */
18971979 	if (rdev->supply) {
1898
-		regulator_unlock(rdev);
1980
+		regulator_unlock_two(rdev, r, &ww_ctx);
18991981 		put_device(&r->dev);
19001982 		goto out;
19011983 	}
19021984 
19031985 	ret = set_supply(rdev, r);
19041986 	if (ret < 0) {
1905
-		regulator_unlock(rdev);
1987
+		regulator_unlock_two(rdev, r, &ww_ctx);
19061988 		put_device(&r->dev);
19071989 		goto out;
19081990 	}
19091991 
1910
-	regulator_unlock(rdev);
1992
+	regulator_unlock_two(rdev, r, &ww_ctx);
19111993 
19121994 	/*
19131995 	 * In set_machine_constraints() we may have turned this regulator on
....@@ -2020,7 +2102,9 @@
20202102 		return regulator;
20212103 	}
20222104 
2105
+	regulator_lock(rdev);
20232106 	regulator = create_regulator(rdev, dev, id);
2107
+	regulator_unlock(rdev);
20242108 	if (regulator == NULL) {
20252109 		regulator = ERR_PTR(-ENOMEM);
20262110 		module_put(rdev->owner);
....@@ -5216,10 +5300,8 @@
52165300 	}
52175301 
52185302 	rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
5219
-	if (!rdev->debugfs) {
5220
-		rdev_warn(rdev, "Failed to create debugfs directory\n");
5221
-		return;
5222
-	}
5303
+	if (IS_ERR(rdev->debugfs))
5304
+		rdev_dbg(rdev, "Failed to create debugfs directory\n");
52235305 
52245306 	debugfs_create_u32("use_count", 0444, rdev->debugfs,
52255307 			   &rdev->use_count);
....@@ -5742,6 +5824,7 @@
57425824 	regulator_remove_coupling(rdev);
57435825 	mutex_unlock(&regulator_list_mutex);
57445826 wash:
5827
+	regulator_put(rdev->supply);
57455828 	kfree(rdev->coupling_desc.coupled_rdevs);
57465829 	mutex_lock(&regulator_list_mutex);
57475830 	regulator_ena_gpio_free(rdev);
....@@ -6135,6 +6218,7 @@
61356218 			ww_mutex_lock_slow(&new_contended_rdev->mutex, ww_ctx);
61366219 			old_contended_rdev = new_contended_rdev;
61376220 			old_contended_rdev->ref_cnt++;
6221
+			old_contended_rdev->mutex_owner = current;
61386222 		}
61396223 
61406224 		err = regulator_summary_lock_all(ww_ctx,
....@@ -6195,8 +6279,8 @@
61956279 	ret = class_register(&regulator_class);
61966280 
61976281 	debugfs_root = debugfs_create_dir("regulator", NULL);
6198
-	if (!debugfs_root)
6199
-		pr_warn("regulator: Failed to create debugfs directory\n");
6282
+	if (IS_ERR(debugfs_root))
6283
+		pr_debug("regulator: Failed to create debugfs directory\n");
62006284 
62016285 #ifdef CONFIG_DEBUG_FS
62026286 	debugfs_create_file("supply_map", 0444, debugfs_root, NULL,