[PATCH v2 3/5] usb: uvc: make uvc_format_desc table const

[Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>]

Since the uvc_fmts array can not be modified we declare it const and
change every user of the uvc_format_by_guid function aswell.

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Reviewed-by: Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>
Tested-by: Daniel Scally <dan.scally@xxxxxxxxxxxxxxxx>
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>

---
v1 -> v2: - added reviewed and tested tags
---
 drivers/media/common/uvc.c             | 4 ++--
 drivers/media/usb/uvc/uvc_driver.c     | 2 +-
 drivers/usb/gadget/function/uvc_v4l2.c | 8 ++++----
 include/linux/usb/uvc.h                | 2 +-
 4 files changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/media/common/uvc.c b/drivers/media/common/uvc.c
index 7472ef42a5ac6d..a9d587490de8d5 100644
--- a/drivers/media/common/uvc.c
+++ b/drivers/media/common/uvc.c
@@ -11,7 +11,7 @@
  * Video formats
  */
 
-static struct uvc_format_desc uvc_fmts[] = {
+static const struct uvc_format_desc uvc_fmts[] = {
 	{
 		.name		= "YUV 4:2:2 (YUYV)",
 		.guid		= UVC_GUID_FORMAT_YUY2,
@@ -199,7 +199,7 @@ static struct uvc_format_desc uvc_fmts[] = {
 	},
 };
 
-struct uvc_format_desc *uvc_format_by_guid(const u8 guid[16])
+const struct uvc_format_desc *uvc_format_by_guid(const u8 guid[16])
 {
 	unsigned int len = ARRAY_SIZE(uvc_fmts);
 	unsigned int i;
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 13023cdd37e50b..12b6ad0966d94a 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -224,7 +224,7 @@ static int uvc_parse_format(struct uvc_device *dev,
 {
 	struct usb_interface *intf = streaming->intf;
 	struct usb_host_interface *alts = intf->cur_altsetting;
-	struct uvc_format_desc *fmtdesc;
+	const struct uvc_format_desc *fmtdesc;
 	struct uvc_frame *frame;
 	const unsigned char *start = buffer;
 	unsigned int width_multiplier = 1;
diff --git a/drivers/usb/gadget/function/uvc_v4l2.c b/drivers/usb/gadget/function/uvc_v4l2.c
index 7435df0cf2a847..21e573e628f4e7 100644
--- a/drivers/usb/gadget/function/uvc_v4l2.c
+++ b/drivers/usb/gadget/function/uvc_v4l2.c
@@ -27,10 +27,10 @@
 #include "uvc_v4l2.h"
 #include "uvc_configfs.h"
 
-static struct uvc_format_desc *to_uvc_format(struct uvcg_format *uformat)
+static const struct uvc_format_desc *to_uvc_format(struct uvcg_format *uformat)
 {
 	char guid[16] = UVC_GUID_FORMAT_MJPEG;
-	struct uvc_format_desc *format;
+	const struct uvc_format_desc *format;
 	struct uvcg_uncompressed *unc;
 
 	if (uformat->type == UVCG_UNCOMPRESSED) {
@@ -119,7 +119,7 @@ static struct uvcg_format *find_format_by_pix(struct uvc_device *uvc,
 	struct uvcg_format *uformat = NULL;
 
 	list_for_each_entry(format, &uvc->header->formats, entry) {
-		struct uvc_format_desc *fmtdesc = to_uvc_format(format->fmt);
+		const struct uvc_format_desc *fmtdesc = to_uvc_format(format->fmt);
 
 		if (fmtdesc->fcc == pixelformat) {
 			uformat = format->fmt;
@@ -364,7 +364,7 @@ uvc_v4l2_enum_format(struct file *file, void *fh, struct v4l2_fmtdesc *f)
 {
 	struct video_device *vdev = video_devdata(file);
 	struct uvc_device *uvc = video_get_drvdata(vdev);
-	struct uvc_format_desc *fmtdesc;
+	const struct uvc_format_desc *fmtdesc;
 	struct uvcg_format *uformat;
 
 	if (f->index >= uvc->header->num_fmt)
diff --git a/include/linux/usb/uvc.h b/include/linux/usb/uvc.h
index a2dae2b40a2318..227a03f252a5c0 100644
--- a/include/linux/usb/uvc.h
+++ b/include/linux/usb/uvc.h
@@ -151,6 +151,6 @@ struct uvc_format_desc {
 	u32 fcc;
 };
 
-struct uvc_format_desc *uvc_format_by_guid(const u8 guid[16]);
+const struct uvc_format_desc *uvc_format_by_guid(const u8 guid[16]);
 
 #endif /* __LINUX_V4L2_UVC_H */
-- 
2.30.2