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FROMGIT: usb: gadget: uvc: prevent use of disabled endpoint

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Currently the set_alt callback immediately disables the endpoint and queues
the v4l2 streamoff event. However, as the streamoff event is processed
asynchronously, it is possible that the video_pump thread attempts to queue
requests to an already disabled endpoint.

This change moves disabling usb endpoint to the end of streamoff event
callback. As the endpoint's state can no longer be used, video_pump is
now guarded by uvc->state as well. To be consistent with the actual
streaming state, uvc->state is now toggled between CONNECTED and STREAMING
from the v4l2 event callback only.

Link: https://lore.kernel.org/20230615171558.GK741@pendragon.ideasonboard.com/
Link: https://lore.kernel.org/20230531085544.253363-1-dan.scally@ideasonboard.com/
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>
Reviewed-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Tested-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: Avichal Rakesh <arakesh@google.com>
Link: https://lore.kernel.org/r/20231109004104.3467968-1-arakesh@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 296925310
(cherry picked from commit 991544dc579b636e69defa3eec486fd6f6191e59
 https://kernel.googlesource.com/pub/scm/linux/kernel/git/gregkh/usb usb-next)
Change-Id: Ic5631a526e72cbcf299dcb8167bb3d34468d37e9
Signed-off-by: Avichal Rakesh <arakesh@google.com>
This commit is contained in:
Avichal Rakesh 2023-11-08 16:41:01 -08:00 • committed by Treehugger Robot
parent 9673df54cd
commit 5f3550218b
5 changed files with 26 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

11
drivers/usb/gadget/function/f_uvc.c
View file

@ -263,10 +263,13 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
return 0;
}
void uvc_function_setup_continue(struct uvc_device *uvc)
void uvc_function_setup_continue(struct uvc_device *uvc, int disable_ep)
{
struct usb_composite_dev *cdev = uvc->func.config->cdev;
if (disable_ep && uvc->video.ep)
usb_ep_disable(uvc->video.ep);
usb_composite_setup_continue(cdev);
}
@ -334,15 +337,11 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
if (uvc->state != UVC_STATE_STREAMING)
return 0;
if (uvc->video.ep)
usb_ep_disable(uvc->video.ep);
memset(&v4l2_event, 0, sizeof(v4l2_event));
v4l2_event.type = UVC_EVENT_STREAMOFF;
v4l2_event_queue(&uvc->vdev, &v4l2_event);
uvc->state = UVC_STATE_CONNECTED;
return 0;
return USB_GADGET_DELAYED_STATUS;
case 1:
if (uvc->state != UVC_STATE_CONNECTED)

2
drivers/usb/gadget/function/f_uvc.h
View file

@ -11,7 +11,7 @@
struct uvc_device;
void uvc_function_setup_continue(struct uvc_device *uvc);
void uvc_function_setup_continue(struct uvc_device *uvc, int disable_ep);
void uvc_function_connect(struct uvc_device *uvc);

2
drivers/usb/gadget/function/uvc.h
View file

@ -175,7 +175,7 @@ struct uvc_file_handle {
* Functions
*/
extern void uvc_function_setup_continue(struct uvc_device *uvc);
extern void uvc_function_setup_continue(struct uvc_device *uvc, int disable_ep);
extern void uvc_function_connect(struct uvc_device *uvc);
extern void uvc_function_disconnect(struct uvc_device *uvc);

20
drivers/usb/gadget/function/uvc_v4l2.c
View file

@ -457,7 +457,7 @@ uvc_v4l2_streamon(struct file *file, void *fh, enum v4l2_buf_type type)
* Complete the alternate setting selection setup phase now that
* userspace is ready to provide video frames.
*/
uvc_function_setup_continue(uvc);
uvc_function_setup_continue(uvc, 0);
uvc->state = UVC_STATE_STREAMING;
return 0;
@ -469,11 +469,18 @@ uvc_v4l2_streamoff(struct file *file, void *fh, enum v4l2_buf_type type)
struct video_device *vdev = video_devdata(file);
struct uvc_device *uvc = video_get_drvdata(vdev);
struct uvc_video *video = &uvc->video;
int ret = 0;
if (type != video->queue.queue.type)
return -EINVAL;
return uvcg_video_enable(video, 0);
uvc->state = UVC_STATE_CONNECTED;
ret = uvcg_video_enable(video, 0);
if (ret < 0)
return ret;
uvc_function_setup_continue(uvc, 1);
return 0;
}
static int
@ -506,6 +513,14 @@ uvc_v4l2_subscribe_event(struct v4l2_fh *fh,
static void uvc_v4l2_disable(struct uvc_device *uvc)
{
uvc_function_disconnect(uvc);
/*
* Drop uvc->state to CONNECTED if it was streaming before.
* This ensures that the usb_requests are no longer queued
* to the controller.
*/
if (uvc->state == UVC_STATE_STREAMING)
uvc->state = UVC_STATE_CONNECTED;
uvcg_video_enable(&uvc->video, 0);
uvcg_free_buffers(&uvc->video.queue);
uvc->func_connected = false;
@ -653,4 +668,3 @@ const struct v4l2_file_operations uvc_v4l2_fops = {
.get_unmapped_area = uvcg_v4l2_get_unmapped_area,
#endif
};

3
drivers/usb/gadget/function/uvc_video.c
View file

@ -384,13 +384,14 @@ static void uvcg_video_pump(struct work_struct *work)
struct uvc_video_queue *queue = &video->queue;
/* video->max_payload_size is only set when using bulk transfer */
bool is_bulk = video->max_payload_size;
struct uvc_device *uvc = video->uvc;
struct usb_request *req = NULL;
struct uvc_buffer *buf;
unsigned long flags;
bool buf_done;
int ret;
while (video->ep->enabled) {
while (uvc->state == UVC_STATE_STREAMING && video->ep->enabled) {
/*
* Retrieve the first available USB request, protected by the
* request lock.