Merge branch 'for-6.5/core' into for-linus

- more bullet-proof handling of devres-managed resources in HID core
  (Dmitry Torokhov)
- kunit test Kconfig dependency fix (Geert Uytterhoeven)

3 files changed, 73 insertions, 48 deletions

diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 4ce012f83253..b977450cac75 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -1285,7 +1285,7 @@ config HID_MCP2221
 
 config HID_KUNIT_TEST
 	tristate "KUnit tests for HID" if !KUNIT_ALL_TESTS
-	depends on KUNIT=y
+	depends on KUNIT
 	depends on HID_BATTERY_STRENGTH
 	depends on HID_UCLOGIC
 	default KUNIT_ALL_TESTS
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index 22623eb4f72f..8992e3c1e769 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -2587,64 +2587,84 @@ bool hid_compare_device_paths(struct hid_device *hdev_a,
 }
 EXPORT_SYMBOL_GPL(hid_compare_device_paths);
 
+static bool hid_check_device_match(struct hid_device *hdev,
+				   struct hid_driver *hdrv,
+				   const struct hid_device_id **id)
+{
+	*id = hid_match_device(hdev, hdrv);
+	if (!*id)
+		return false;
+
+	if (hdrv->match)
+		return hdrv->match(hdev, hid_ignore_special_drivers);
+
+	/*
+	 * hid-generic implements .match(), so we must be dealing with a
+	 * different HID driver here, and can simply check if
+	 * hid_ignore_special_drivers is set or not.
+	 */
+	return !hid_ignore_special_drivers;
+}
+
+static int __hid_device_probe(struct hid_device *hdev, struct hid_driver *hdrv)
+{
+	const struct hid_device_id *id;
+	int ret;
+
+	if (!hid_check_device_match(hdev, hdrv, &id))
+		return -ENODEV;
+
+	hdev->devres_group_id = devres_open_group(&hdev->dev, NULL, GFP_KERNEL);
+	if (!hdev->devres_group_id)
+		return -ENOMEM;
+
+	/* reset the quirks that has been previously set */
+	hdev->quirks = hid_lookup_quirk(hdev);
+	hdev->driver = hdrv;
+
+	if (hdrv->probe) {
+		ret = hdrv->probe(hdev, id);
+	} else { /* default probe */
+		ret = hid_open_report(hdev);
+		if (!ret)
+			ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
+	}
+
+	/*
+	 * Note that we are not closing the devres group opened above so
+	 * even resources that were attached to the device after probe is
+	 * run are released when hid_device_remove() is executed. This is
+	 * needed as some drivers would allocate additional resources,
+	 * for example when updating firmware.
+	 */
+
+	if (ret) {
+		devres_release_group(&hdev->dev, hdev->devres_group_id);
+		hid_close_report(hdev);
+		hdev->driver = NULL;
+	}
+
+	return ret;
+}
+
 static int hid_device_probe(struct device *dev)
 {
-	struct hid_driver *hdrv = to_hid_driver(dev->driver);
 	struct hid_device *hdev = to_hid_device(dev);
-	const struct hid_device_id *id;
+	struct hid_driver *hdrv = to_hid_driver(dev->driver);
 	int ret = 0;
 
-	if (down_interruptible(&hdev->driver_input_lock)) {
-		ret = -EINTR;
-		goto end;
-	}
-	hdev->io_started = false;
+	if (down_interruptible(&hdev->driver_input_lock))
+		return -EINTR;
 
+	hdev->io_started = false;
 	clear_bit(ffs(HID_STAT_REPROBED), &hdev->status);
 
-	if (!hdev->driver) {
-		id = hid_match_device(hdev, hdrv);
-		if (id == NULL) {
-			ret = -ENODEV;
-			goto unlock;
-		}
-
-		if (hdrv->match) {
-			if (!hdrv->match(hdev, hid_ignore_special_drivers)) {
-				ret = -ENODEV;
-				goto unlock;
-			}
-		} else {
-			/*
-			 * hid-generic implements .match(), so if
-			 * hid_ignore_special_drivers is set, we can safely
-			 * return.
-			 */
-			if (hid_ignore_special_drivers) {
-				ret = -ENODEV;
-				goto unlock;
-			}
-		}
+	if (!hdev->driver)
+		ret = __hid_device_probe(hdev, hdrv);
 
-		/* reset the quirks that has been previously set */
-		hdev->quirks = hid_lookup_quirk(hdev);
-		hdev->driver = hdrv;
-		if (hdrv->probe) {
-			ret = hdrv->probe(hdev, id);
-		} else { /* default probe */
-			ret = hid_open_report(hdev);
-			if (!ret)
-				ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
-		}
-		if (ret) {
-			hid_close_report(hdev);
-			hdev->driver = NULL;
-		}
-	}
-unlock:
 	if (!hdev->io_started)
 		up(&hdev->driver_input_lock);
-end:
+
 	return ret;
 }
 
@@ -2662,6 +2682,10 @@ static void hid_device_remove(struct device *dev)
 			hdrv->remove(hdev);
 		else /* default remove */
 			hid_hw_stop(hdev);
+
+		/* Release all devres resources allocated by the driver */
+		devres_release_group(&hdev->dev, hdev->devres_group_id);
+
 		hid_close_report(hdev);
 		hdev->driver = NULL;
 	}
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 4e4c4fe36911..39e21e3815ad 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -597,6 +597,7 @@ struct hid_device {							/* device report descriptor */
 	struct semaphore driver_input_lock;				/* protects the current driver */
 	struct device dev;						/* device */
 	struct hid_driver *driver;
+	void *devres_group_id;						/* ID of probe devres group	*/
 
 	const struct hid_ll_driver *ll_driver;
 	struct mutex ll_open_lock;