[PATCH v1 07/19] uvcvideo: Unify error reporting during format descriptor parsing.

Pawel Osciak
2013-08-30T02:17:40Z

Add common error handling paths for format parsing failures.

Signed-off-by: Pawel Osciak <posciak@chromium.org>
---
drivers/media/usb/uvc/uvc_driver.c | 35 ++++++++++++++---------------------
1 file changed, 14 insertions(+), 21 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index d950b40..936ddc7 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -322,13 +322,8 @@ static int uvc_parse_format(struct uvc_device *dev,
case UVC_VS_FORMAT_UNCOMPRESSED:
case UVC_VS_FORMAT_FRAME_BASED:
n = buffer[2] == UVC_VS_FORMAT_UNCOMPRESSED ? 27 : 28;
- if (buflen < n) {
- uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
- "interface %d FORMAT error\n",
- dev->udev->devnum,
- alts->desc.bInterfaceNumber);
- return -EINVAL;
- }
+ if (buflen < n)
+ goto format_error;

/* Find the format descriptor from its GUID. */
fmtdesc = uvc_format_by_guid(&buffer[5]);
@@ -356,13 +351,8 @@ static int uvc_parse_format(struct uvc_device *dev,
break;

case UVC_VS_FORMAT_MJPEG:
- if (buflen < 11) {
- uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
- "interface %d FORMAT error\n",
- dev->udev->devnum,
- alts->desc.bInterfaceNumber);
- return -EINVAL;
- }
+ if (buflen < 11)
+ goto format_error;

strlcpy(format->name, "MJPEG", sizeof format->name);
format->fcc = V4L2_PIX_FMT_MJPEG;
@@ -372,13 +362,8 @@ static int uvc_parse_format(struct uvc_device *dev,
break;

case UVC_VS_FORMAT_DV:
- if (buflen < 9) {
- uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
- "interface %d FORMAT error\n",
- dev->udev->devnum,
- alts->desc.bInterfaceNumber);
- return -EINVAL;
- }
+ if (buflen < 9)
+ goto format_error;

switch (buffer[8] & 0x7f) {
case 0:
@@ -542,6 +527,14 @@ static int uvc_parse_format(struct uvc_device *dev,
}

return buffer - start;
+
+format_error:
+ uvc_trace(UVC_TRACE_DESCR, "device %d videostreaming "
+ "interface %d FORMAT error\n",
+ dev->udev->devnum,
+ alts->desc.bInterfaceNumber);
+ return -EINVAL;
+
}

static int uvc_parse_streaming(struct uvc_device *dev,
--
1.8.4