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media: uvcvideo: Constify formats, frames and intervals 

The formats, frames and intervals stored in the uvc_streaming structure
are not meant to change after being parsed at probe time. Make them
const to prevent unintended modifications, and adapt the probe code
accordingly to use non-const pointers during parsing.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Laurent Pinchart 2023-04-20 06:47:57 +03:00 committed by Mauro Carvalho Chehab
parent 7691d900b9
commit af621ba2ed
4 changed files with 34 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/media/usb/uvc/uvc_driver.c
View File

@ -221,7 +221,8 @@ static struct uvc_streaming *uvc_stream_new(struct uvc_device *dev,
static int uvc_parse_format(struct uvc_device *dev,
struct uvc_streaming *streaming, struct uvc_format *format,
u32 **intervals, unsigned char *buffer, int buflen)
struct uvc_frame *frames, u32 **intervals, unsigned char *buffer,
int buflen)
{
struct usb_interface *intf = streaming->intf;
struct usb_host_interface *alts = intf->cur_altsetting;
@ -235,6 +236,7 @@ static int uvc_parse_format(struct uvc_device *dev,
format->type = buffer[2];
format->index = buffer[3];
format->frames = frames;
switch (buffer[2]) {
case UVC_VS_FORMAT_UNCOMPRESSED:
@ -339,8 +341,8 @@ static int uvc_parse_format(struct uvc_device *dev,
ftype = 0;
/* Create a dummy frame descriptor. */
frame = &format->frames[0];
memset(&format->frames[0], 0, sizeof(format->frames[0]));
frame = &frames[0];
memset(frame, 0, sizeof(*frame));
frame->bFrameIntervalType = 1;
frame->dwDefaultFrameInterval = 1;
frame->dwFrameInterval = *intervals;
@ -372,7 +374,7 @@ static int uvc_parse_format(struct uvc_device *dev,
buffer[2] == ftype) {
unsigned int maxIntervalIndex;
frame = &format->frames[format->nframes];
frame = &frames[format->nframes];
if (ftype != UVC_VS_FRAME_FRAME_BASED)
n = buflen > 25 ? buffer[25] : 0;
else
@ -460,8 +462,7 @@ static int uvc_parse_format(struct uvc_device *dev,
*/
if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
frame->bFrameIntervalType = 1;
frame->dwFrameInterval[0] =
frame->dwDefaultFrameInterval;
(*intervals)[0] = frame->dwDefaultFrameInterval;
}
uvc_dbg(dev, DESCR, "- %ux%u (%u.%u fps)\n",
@ -706,8 +707,7 @@ static int uvc_parse_streaming(struct uvc_device *dev,
case UVC_VS_FORMAT_MJPEG:
case UVC_VS_FORMAT_DV:
case UVC_VS_FORMAT_FRAME_BASED:
format->frames = frame;
ret = uvc_parse_format(dev, streaming, format,
ret = uvc_parse_format(dev, streaming, format, frame,
&interval, buffer, buflen);
if (ret < 0)
goto error;

31
drivers/media/usb/uvc/uvc_v4l2.c
View File

@ -161,7 +161,7 @@ free_map:
* the Video Probe and Commit negotiation, but some hardware don't implement
* that feature.
*/
static u32 uvc_try_frame_interval(struct uvc_frame *frame, u32 interval)
static u32 uvc_try_frame_interval(const struct uvc_frame *frame, u32 interval)
{
unsigned int i;
@ -210,10 +210,11 @@ static u32 uvc_v4l2_get_bytesperline(const struct uvc_format *format,
static int uvc_v4l2_try_format(struct uvc_streaming *stream,
struct v4l2_format *fmt, struct uvc_streaming_control *probe,
struct uvc_format **uvc_format, struct uvc_frame **uvc_frame)
const struct uvc_format **uvc_format,
const struct uvc_frame **uvc_frame)
{
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
const struct uvc_format *format = NULL;
const struct uvc_frame *frame = NULL;
u16 rw, rh;
unsigned int d, maxd;
unsigned int i;
@ -363,8 +364,8 @@ static int uvc_v4l2_try_format(struct uvc_streaming *stream,
static int uvc_v4l2_get_format(struct uvc_streaming *stream,
struct v4l2_format *fmt)
{
struct uvc_format *format;
struct uvc_frame *frame;
const struct uvc_format *format;
const struct uvc_frame *frame;
int ret = 0;
if (fmt->type != stream->type)
@ -398,8 +399,8 @@ static int uvc_v4l2_set_format(struct uvc_streaming *stream,
struct v4l2_format *fmt)
{
struct uvc_streaming_control probe;
struct uvc_format *format;
struct uvc_frame *frame;
const struct uvc_format *format;
const struct uvc_frame *frame;
int ret;
if (fmt->type != stream->type)
@ -465,8 +466,8 @@ static int uvc_v4l2_set_streamparm(struct uvc_streaming *stream,
{
struct uvc_streaming_control probe;
struct v4l2_fract timeperframe;
struct uvc_format *format;
struct uvc_frame *frame;
const struct uvc_format *format;
const struct uvc_frame *frame;
u32 interval, maxd;
unsigned int i;
int ret;
@ -697,7 +698,7 @@ static int uvc_ioctl_querycap(struct file *file, void *fh,
static int uvc_ioctl_enum_fmt(struct uvc_streaming *stream,
struct v4l2_fmtdesc *fmt)
{
struct uvc_format *format;
const struct uvc_format *format;
enum v4l2_buf_type type = fmt->type;
u32 index = fmt->index;
@ -1249,8 +1250,8 @@ static int uvc_ioctl_enum_framesizes(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
const struct uvc_format *format = NULL;
const struct uvc_frame *frame = NULL;
unsigned int index;
unsigned int i;
@ -1289,8 +1290,8 @@ static int uvc_ioctl_enum_frameintervals(struct file *file, void *fh,
{
struct uvc_fh *handle = fh;
struct uvc_streaming *stream = handle->stream;
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
const struct uvc_format *format = NULL;
const struct uvc_frame *frame = NULL;
unsigned int nintervals;
unsigned int index;
unsigned int i;

8
drivers/media/usb/uvc/uvc_video.c
View File

@ -137,8 +137,8 @@ static const struct usb_device_id elgato_cam_link_4k = {
static void uvc_fixup_video_ctrl(struct uvc_streaming *stream,
struct uvc_streaming_control *ctrl)
{
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
const struct uvc_format *format = NULL;
const struct uvc_frame *frame = NULL;
unsigned int i;
/*
@ -2100,8 +2100,8 @@ int uvc_video_resume(struct uvc_streaming *stream, int reset)
int uvc_video_init(struct uvc_streaming *stream)
{
struct uvc_streaming_control *probe = &stream->ctrl;
struct uvc_format *format = NULL;
struct uvc_frame *frame = NULL;
const struct uvc_format *format = NULL;
const struct uvc_frame *frame = NULL;
struct uvc_urb *uvc_urb;
unsigned int i;
int ret;

12
drivers/media/usb/uvc/uvcvideo.h
View File

@ -251,7 +251,7 @@ struct uvc_frame {
u32 dwMaxVideoFrameBufferSize;
u8 bFrameIntervalType;
u32 dwDefaultFrameInterval;
u32 *dwFrameInterval;
const u32 *dwFrameInterval;
};
struct uvc_format {
@ -265,7 +265,7 @@ struct uvc_format {
u32 flags;
unsigned int nframes;
struct uvc_frame *frames;
const struct uvc_frame *frames;
};
struct uvc_streaming_header {
@ -438,12 +438,12 @@ struct uvc_streaming {
enum v4l2_buf_type type;
unsigned int nformats;
struct uvc_format *formats;
const struct uvc_format *formats;
struct uvc_streaming_control ctrl;
struct uvc_format *def_format;
struct uvc_format *cur_format;
struct uvc_frame *cur_frame;
const struct uvc_format *def_format;
const struct uvc_format *cur_format;
const struct uvc_frame *cur_frame;
/*
* Protect access to ctrl, cur_format, cur_frame and hardware video