Merge tag 'media/v6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media fix from Mauro Carvalho Chehab:
 "A revert for a regression in the uvcvideo driver"

* tag 'media/v6.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media:
  Revert "media: uvcvideo: Require entities to have a non-zero unique ID"

1 files changed, 27 insertions, 43 deletions

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index a10d4f4d9f95..deadbcea5e22 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -790,27 +790,14 @@ static const u8 uvc_media_transport_input_guid[16] =
 	UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
 static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
 
-static struct uvc_entity *uvc_alloc_new_entity(struct uvc_device *dev, u16 type,
-					       u16 id, unsigned int num_pads,
-					       unsigned int extra_size)
+static struct uvc_entity *uvc_alloc_entity(u16 type, u16 id,
+		unsigned int num_pads, unsigned int extra_size)
 {
 	struct uvc_entity *entity;
 	unsigned int num_inputs;
 	unsigned int size;
 	unsigned int i;
 
-	/* Per UVC 1.1+ spec 3.7.2, the ID should be non-zero. */
-	if (id == 0) {
-		dev_err(&dev->udev->dev, "Found Unit with invalid ID 0.\n");
-		return ERR_PTR(-EINVAL);
-	}
-
-	/* Per UVC 1.1+ spec 3.7.2, the ID is unique. */
-	if (uvc_entity_by_id(dev, id)) {
-		dev_err(&dev->udev->dev, "Found multiple Units with ID %u\n", id);
-		return ERR_PTR(-EINVAL);
-	}
-
 	extra_size = roundup(extra_size, sizeof(*entity->pads));
 	if (num_pads)
 		num_inputs = type & UVC_TERM_OUTPUT ? num_pads : num_pads - 1;
@@ -820,7 +807,7 @@ static struct uvc_entity *uvc_alloc_new_entity(struct uvc_device *dev, u16 type,
 	     + num_inputs;
 	entity = kzalloc(size, GFP_KERNEL);
 	if (entity == NULL)
-		return ERR_PTR(-ENOMEM);
+		return NULL;
 
 	entity->id = id;
 	entity->type = type;
@@ -932,10 +919,10 @@ static int uvc_parse_vendor_control(struct uvc_device *dev,
 			break;
 		}
 
-		unit = uvc_alloc_new_entity(dev, UVC_VC_EXTENSION_UNIT,
-					    buffer[3], p + 1, 2 * n);
-		if (IS_ERR(unit))
-			return PTR_ERR(unit);
+		unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3],
+					p + 1, 2*n);
+		if (unit == NULL)
+			return -ENOMEM;
 
 		memcpy(unit->guid, &buffer[4], 16);
 		unit->extension.bNumControls = buffer[20];
@@ -1044,10 +1031,10 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
 			return -EINVAL;
 		}
 
-		term = uvc_alloc_new_entity(dev, type | UVC_TERM_INPUT,
-					    buffer[3], 1, n + p);
-		if (IS_ERR(term))
-			return PTR_ERR(term);
+		term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3],
+					1, n + p);
+		if (term == NULL)
+			return -ENOMEM;
 
 		if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) {
 			term->camera.bControlSize = n;
@@ -1103,10 +1090,10 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
 			return 0;
 		}
 
-		term = uvc_alloc_new_entity(dev, type | UVC_TERM_OUTPUT,
-					    buffer[3], 1, 0);
-		if (IS_ERR(term))
-			return PTR_ERR(term);
+		term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3],
+					1, 0);
+		if (term == NULL)
+			return -ENOMEM;
 
 		memcpy(term->baSourceID, &buffer[7], 1);
 
@@ -1125,10 +1112,9 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
 			return -EINVAL;
 		}
 
-		unit = uvc_alloc_new_entity(dev, buffer[2], buffer[3],
-					    p + 1, 0);
-		if (IS_ERR(unit))
-			return PTR_ERR(unit);
+		unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0);
+		if (unit == NULL)
+			return -ENOMEM;
 
 		memcpy(unit->baSourceID, &buffer[5], p);
 
@@ -1148,9 +1134,9 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
 			return -EINVAL;
 		}
 
-		unit = uvc_alloc_new_entity(dev, buffer[2], buffer[3], 2, n);
-		if (IS_ERR(unit))
-			return PTR_ERR(unit);
+		unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n);
+		if (unit == NULL)
+			return -ENOMEM;
 
 		memcpy(unit->baSourceID, &buffer[4], 1);
 		unit->processing.wMaxMultiplier =
@@ -1177,10 +1163,9 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
 			return -EINVAL;
 		}
 
-		unit = uvc_alloc_new_entity(dev, buffer[2], buffer[3],
-					    p + 1, n);
-		if (IS_ERR(unit))
-			return PTR_ERR(unit);
+		unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n);
+		if (unit == NULL)
+			return -ENOMEM;
 
 		memcpy(unit->guid, &buffer[4], 16);
 		unit->extension.bNumControls = buffer[20];
@@ -1320,10 +1305,9 @@ static int uvc_gpio_parse(struct uvc_device *dev)
 		return dev_err_probe(&dev->intf->dev, irq,
 				     "No IRQ for privacy GPIO\n");
 
-	unit = uvc_alloc_new_entity(dev, UVC_EXT_GPIO_UNIT,
-				    UVC_EXT_GPIO_UNIT_ID, 0, 1);
-	if (IS_ERR(unit))
-		return PTR_ERR(unit);
+	unit = uvc_alloc_entity(UVC_EXT_GPIO_UNIT, UVC_EXT_GPIO_UNIT_ID, 0, 1);
+	if (!unit)
+		return -ENOMEM;
 
 	unit->gpio.gpio_privacy = gpio_privacy;
 	unit->gpio.irq = irq;