diff options
| author | Kuen-Han Tsai <khtsai@google.com> | 2025-08-18 16:27:19 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-09-12 14:03:14 +0200 |
| commit | 7bf1158514e410310aec975e630cec99d4e4092f (patch) | |
| tree | 6e8c3708c10d2144cdb4cad2b960d87b82736d76 | |
| parent | e77ee1d2a8fa0f3179d4ac7b7d35b555da6a8cea (diff) | |
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: Kuen-Han Tsai <khtsai@google.com>
Link: https://lore.kernel.org/r/20250818082722.2952867-1-khtsai@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/gadget/udc/core.c | 1 | ||||
| -rw-r--r-- | drivers/usb/gadget/udc/trace.h | 5 |
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index d709e24c1fd4..e28fea614496 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -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); diff --git a/drivers/usb/gadget/udc/trace.h b/drivers/usb/gadget/udc/trace.h index 4e334298b0e8..fa3e6ddf0a12 100644 --- a/drivers/usb/gadget/udc/trace.h +++ b/drivers/usb/gadget/udc/trace.h @@ -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) |