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media: uvcvideo: Handle errors from calls to usb_string

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On a Webcam from Quanta, we see the following error.

usb 3-5: New USB device found, idVendor=0408, idProduct=30d2, bcdDevice= 0.03
usb 3-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
usb 3-5: Product: USB2.0 HD UVC WebCam
usb 3-5: Manufacturer: Quanta
usb 3-5: SerialNumber: 0x0001
...
uvcvideo: Found UVC 1.10 device USB2.0 HD UVC WebCam (0408:30d2)
uvcvideo: Failed to initialize entity for entity 5
uvcvideo: Failed to register entities (-22).

The Webcam reports an entity of type UVC_VC_EXTENSION_UNIT. It reports a
string index of '7' associated with that entity. The attempt to read that
string from the camera fails with error -32 (-EPIPE). usb_string() returns
that error, but it is ignored. As result, the entity name is empty. This
later causes v4l2_device_register_subdev() to return -EINVAL, and no
entities are registered as result.

While this appears to be a firmware problem with the camera, the kernel
should still handle the situation gracefully. To do that, check the return
value from usb_string(). If it reports an error, assign the entity's
default name.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Guenter Roeck 2022-10-25 16:41:01 +02:00 committed by Laurent Pinchart
parent 3bc22dc66a
commit 4867bb590a
1 changed files with 19 additions and 29 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

48
drivers/media/usb/uvc/uvc_driver.c
View file

@ -859,10 +859,8 @@ static int uvc_parse_vendor_control(struct uvc_device *dev,
+ n;
memcpy(unit->extension.bmControls, &buffer[23+p], 2*n);
if (buffer[24+p+2*n] != 0)
usb_string(udev, buffer[24+p+2*n], unit->name,
sizeof(unit->name));
else
if (buffer[24+p+2*n] == 0 ||
usb_string(udev, buffer[24+p+2*n], unit->name, sizeof(unit->name)) < 0)
sprintf(unit->name, "Extension %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);
@ -986,15 +984,15 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
memcpy(term->media.bmTransportModes, &buffer[10+n], p);
}
if (buffer[7] != 0)
usb_string(udev, buffer[7], term->name,
sizeof(term->name));
else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
sprintf(term->name, "Camera %u", buffer[3]);
else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
sprintf(term->name, "Media %u", buffer[3]);
else
sprintf(term->name, "Input %u", buffer[3]);
if (buffer[7] == 0 ||
usb_string(udev, buffer[7], term->name, sizeof(term->name)) < 0) {
if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA)
sprintf(term->name, "Camera %u", buffer[3]);
if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT)
sprintf(term->name, "Media %u", buffer[3]);
else
sprintf(term->name, "Input %u", buffer[3]);
}
list_add_tail(&term->list, &dev->entities);
break;
@ -1027,10 +1025,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
memcpy(term->baSourceID, &buffer[7], 1);
if (buffer[8] != 0)
usb_string(udev, buffer[8], term->name,
sizeof(term->name));
else
if (buffer[8] == 0 ||
usb_string(udev, buffer[8], term->name, sizeof(term->name)) < 0)
sprintf(term->name, "Output %u", buffer[3]);
list_add_tail(&term->list, &dev->entities);
@ -1052,10 +1048,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
memcpy(unit->baSourceID, &buffer[5], p);
if (buffer[5+p] != 0)
usb_string(udev, buffer[5+p], unit->name,
sizeof(unit->name));
else
if (buffer[5+p] == 0 ||
usb_string(udev, buffer[5+p], unit->name, sizeof(unit->name)) < 0)
sprintf(unit->name, "Selector %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);
@ -1085,10 +1079,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
if (dev->uvc_version >= 0x0110)
unit->processing.bmVideoStandards = buffer[9+n];
if (buffer[8+n] != 0)
usb_string(udev, buffer[8+n], unit->name,
sizeof(unit->name));
else
if (buffer[8+n] == 0 ||
usb_string(udev, buffer[8+n], unit->name, sizeof(unit->name)) < 0)
sprintf(unit->name, "Processing %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);
@ -1116,10 +1108,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
unit->extension.bmControls = (u8 *)unit + sizeof(*unit);
memcpy(unit->extension.bmControls, &buffer[23+p], n);
if (buffer[23+p+n] != 0)
usb_string(udev, buffer[23+p+n], unit->name,
sizeof(unit->name));
else
if (buffer[23+p+n] == 0 ||
usb_string(udev, buffer[23+p+n], unit->name, sizeof(unit->name)) < 0)
sprintf(unit->name, "Extension %u", buffer[3]);
list_add_tail(&unit->list, &dev->entities);