Commit 7bf11585 authored by Kuen-Han Tsai's avatar Kuen-Han Tsai Committed by Greg Kroah-Hartman
Browse files

usb: udc: Add trace event for usb_gadget_set_state 



While the userspace program can be notified of gadget state changes,
timing issue can lead to missed transitions when reading the state
value.

Introduce a trace event for usb_gadget_set_state to reliably track state
transitions.

Signed-off-by: default avatarKuen-Han Tsai <khtsai@google.com>
Link: https://lore.kernel.org/r/20250818082722.2952867-1-khtsai@google.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e77ee1d2

drivers/usb/gadget/udc/core.c

+1 −0
Original line number Diff line number Diff line
@@ -1125,6 +1125,7 @@ void usb_gadget_set_state(struct usb_gadget *gadget, 
{

	gadget->state = state;

	schedule_work(&gadget->work);

	trace_usb_gadget_set_state(gadget, 0);

}

EXPORT_SYMBOL_GPL(usb_gadget_set_state);

drivers/usb/gadget/udc/trace.h

+5 −0
Original line number Diff line number Diff line
@@ -81,6 +81,11 @@ DECLARE_EVENT_CLASS(udc_log_gadget, 
		__entry->ret)

);



DEFINE_EVENT(udc_log_gadget, usb_gadget_set_state,

	TP_PROTO(struct usb_gadget *g, int ret),

	TP_ARGS(g, ret)

);



DEFINE_EVENT(udc_log_gadget, usb_gadget_frame_number,

	TP_PROTO(struct usb_gadget *g, int ret),

	TP_ARGS(g, ret)