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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/dax/bus.c
..
..
@@ -398,23 +398,39 @@
398
398
 	dev_dbg(dev, "%s\n", __func__);
399
399
 
400
400
 	kill_dev_dax(dev_dax);
401
-	free_dev_dax_ranges(dev_dax);
402
401
 	device_del(dev);
402
+	free_dev_dax_ranges(dev_dax);
403
403
 	put_device(dev);
404
404
 }
405
+
406
+static void dax_region_free(struct kref *kref)
407
+{
408
+	struct dax_region *dax_region;
409
+
410
+	dax_region = container_of(kref, struct dax_region, kref);
411
+	kfree(dax_region);
412
+}
413
+
414
+void dax_region_put(struct dax_region *dax_region)
415
+{
416
+	kref_put(&dax_region->kref, dax_region_free);
417
+}
418
+EXPORT_SYMBOL_GPL(dax_region_put);
405
419
 
406
420
 /* a return value >= 0 indicates this invocation invalidated the id */
407
421
 static int __free_dev_dax_id(struct dev_dax *dev_dax)
408
422
 {
409
-	struct dax_region *dax_region = dev_dax->region;
410
423
 	struct device *dev = &dev_dax->dev;
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+	struct dax_region *dax_region;
411
425
 	int rc = dev_dax->id;
412
426
 
413
427
 	device_lock_assert(dev);
414
428
 
415
-	if (is_static(dax_region) || dev_dax->id < 0)
429
+	if (!dev_dax->dyn_id || dev_dax->id < 0)
416
430
 		return -1;
431
+	dax_region = dev_dax->region;
417
432
 	ida_free(&dax_region->ida, dev_dax->id);
433
+	dax_region_put(dax_region);
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434
 	dev_dax->id = -1;
419
435
 	return rc;
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436
 }
..
..
@@ -428,6 +444,20 @@
428
444
 	rc = __free_dev_dax_id(dev_dax);
429
445
 	device_unlock(dev);
430
446
 	return rc;
447
+}
448
+
449
+static int alloc_dev_dax_id(struct dev_dax *dev_dax)
450
+{
451
+	struct dax_region *dax_region = dev_dax->region;
452
+	int id;
453
+
454
+	id = ida_alloc(&dax_region->ida, GFP_KERNEL);
455
+	if (id < 0)
456
+		return id;
457
+	kref_get(&dax_region->kref);
458
+	dev_dax->dyn_id = true;
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+	dev_dax->id = id;
460
+	return id;
431
461
 }
432
462
 
433
463
 static ssize_t delete_store(struct device *dev, struct device_attribute *attr,
..
..
@@ -517,20 +547,6 @@
517
547
 	NULL,
518
548
 };
519
549
 
520
-static void dax_region_free(struct kref *kref)
521
-{
522
-	struct dax_region *dax_region;
523
-
524
-	dax_region = container_of(kref, struct dax_region, kref);
525
-	kfree(dax_region);
526
-}
527
-
528
-void dax_region_put(struct dax_region *dax_region)
529
-{
530
-	kref_put(&dax_region->kref, dax_region_free);
531
-}
532
-EXPORT_SYMBOL_GPL(dax_region_put);
533
-
534
550
 static void dax_region_unregister(void *region)
535
551
 {
536
552
 	struct dax_region *dax_region = region;
..
..
@@ -592,10 +608,12 @@
592
608
 static void dax_mapping_release(struct device *dev)
593
609
 {
594
610
 	struct dax_mapping *mapping = to_dax_mapping(dev);
595
-	struct dev_dax *dev_dax = to_dev_dax(dev->parent);
611
+	struct device *parent = dev->parent;
612
+	struct dev_dax *dev_dax = to_dev_dax(parent);
596
613
 
597
614
 	ida_free(&dev_dax->ida, mapping->id);
598
615
 	kfree(mapping);
616
+	put_device(parent);
599
617
 }
600
618
 
601
619
 static void unregister_dax_mapping(void *data)
..
..
@@ -735,6 +753,7 @@
735
753
 	dev = &mapping->dev;
736
754
 	device_initialize(dev);
737
755
 	dev->parent = &dev_dax->dev;
756
+	get_device(dev->parent);
738
757
 	dev->type = &dax_mapping_type;
739
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 	dev_set_name(dev, "mapping%d", mapping->id);
740
759
 	rc = device_add(dev);
..
..
@@ -1267,12 +1286,10 @@
1267
1286
 static void dev_dax_release(struct device *dev)
1268
1287
 {
1269
1288
 	struct dev_dax *dev_dax = to_dev_dax(dev);
1270
-	struct dax_region *dax_region = dev_dax->region;
1271
1289
 	struct dax_device *dax_dev = dev_dax->dax_dev;
1272
1290
 
1273
1291
 	put_dax(dax_dev);
1274
1292
 	free_dev_dax_id(dev_dax);
1275
-	dax_region_put(dax_region);
1276
1293
 	kfree(dev_dax->pgmap);
1277
1294
 	kfree(dev_dax);
1278
1295
 }
..
..
@@ -1296,6 +1313,7 @@
1296
1313
 	if (!dev_dax)
1297
1314
 		return ERR_PTR(-ENOMEM);
1298
1315
 
1316
+	dev_dax->region = dax_region;
1299
1317
 	if (is_static(dax_region)) {
1300
1318
 		if (dev_WARN_ONCE(parent, data->id < 0,
1301
1319
 				"dynamic id specified to static region\n")) {
..
..
@@ -1311,13 +1329,11 @@
1311
1329
 			goto err_id;
1312
1330
 		}
1313
1331
 
1314
-		rc = ida_alloc(&dax_region->ida, GFP_KERNEL);
1332
+		rc = alloc_dev_dax_id(dev_dax);
1315
1333
 		if (rc < 0)
1316
1334
 			goto err_id;
1317
-		dev_dax->id = rc;
1318
1335
 	}
1319
1336
 
1320
-	dev_dax->region = dax_region;
1321
1337
 	dev = &dev_dax->dev;
1322
1338
 	device_initialize(dev);
1323
1339
 	dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id);
..
..
@@ -1355,7 +1371,6 @@
1355
1371
 	dev_dax->target_node = dax_region->target_node;
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1372
 	dev_dax->align = dax_region->align;
1357
1373
 	ida_init(&dev_dax->ida);
1358
-	kref_get(&dax_region->kref);
1359
1374
 
1360
1375
 	inode = dax_inode(dax_dev);
1361
1376
 	dev->devt = inode->i_rdev;