usb: dwc3: gadget: remove DWC3_EP_BUSY flag

It has no use anymore.
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>

Documentation/driver-api/usb/dwc3.rst

@@ -674,7 +674,7 @@ operations, both of which can be traced. Format is::
   	__entry->flags & DWC3_EP_ENABLED ? 'E' : 'e',
   	__entry->flags & DWC3_EP_STALL ? 'S' : 's',
   	__entry->flags & DWC3_EP_WEDGE ? 'W' : 'w',
-  	__entry->flags & DWC3_EP_BUSY ? 'B' : 'b',
+  	__entry->flags & DWC3_EP_TRANSFER_STARTED ? 'B' : 'b',
   	__entry->flags & DWC3_EP_PENDING_REQUEST ? 'P' : 'p',
   	__entry->flags & DWC3_EP_MISSED_ISOC ? 'M' : 'm',
   	__entry->flags & DWC3_EP_END_TRANSFER_PENDING ? 'E' : 'e',

drivers/usb/dwc3/core.h

@@ -662,11 +662,10 @@ struct dwc3_ep {
 #define DWC3_EP_ENABLED		BIT(0)
 #define DWC3_EP_STALL		BIT(1)
 #define DWC3_EP_WEDGE		BIT(2)
-#define DWC3_EP_BUSY		BIT(4)
+#define DWC3_EP_TRANSFER_STARTED BIT(3)
 #define DWC3_EP_PENDING_REQUEST	BIT(5)
 #define DWC3_EP_MISSED_ISOC	BIT(6)
 #define DWC3_EP_END_TRANSFER_PENDING	BIT(7)
-#define DWC3_EP_TRANSFER_STARTED BIT(8)
 
 	/* This last one is specific to EP0 */
 #define DWC3_EP0_DIR_IN		BIT(31)

drivers/usb/dwc3/ep0.c

@@ -66,7 +66,7 @@ static int dwc3_ep0_start_trans(struct dwc3_ep *dep)
 	struct dwc3			*dwc;
 	int				ret;
 
-	if (dep->flags & DWC3_EP_BUSY)
+	if (dep->flags & DWC3_EP_TRANSFER_STARTED)
 		return 0;
 
 	dwc = dep->dwc;
@@ -79,7 +79,6 @@ static int dwc3_ep0_start_trans(struct dwc3_ep *dep)
 	if (ret < 0)
 		return ret;
 
-	dep->flags |= DWC3_EP_BUSY;
 	dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
 	dwc->ep0_next_event = DWC3_EP0_COMPLETE;
 
@@ -913,7 +912,7 @@ static void dwc3_ep0_xfer_complete(struct dwc3 *dwc,
 {
 	struct dwc3_ep		*dep = dwc->eps[event->endpoint_number];
 
-	dep->flags &= ~DWC3_EP_BUSY;
+	dep->flags &= ~DWC3_EP_TRANSFER_STARTED;
 	dep->resource_index = 0;
 	dwc->setup_packet_pending = false;
 

drivers/usb/dwc3/gadget.c

@@ -691,8 +691,6 @@ static int __dwc3_gadget_ep_enable(struct dwc3_ep *dep,
 		if (ret < 0)
 			return ret;
 
-		dep->flags |= DWC3_EP_BUSY;
-
 		dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
 		WARN_ON_ONCE(!dep->resource_index);
 	}
@@ -1257,8 +1255,6 @@ static int __dwc3_gadget_kick_transfer(struct dwc3_ep *dep)
 		return ret;
 	}
 
-	dep->flags |= DWC3_EP_BUSY;
-
 	if (starting) {
 		dep->resource_index = dwc3_gadget_ep_get_transfer_index(dep);
 		WARN_ON_ONCE(!dep->resource_index);
@@ -2389,7 +2385,7 @@ static int dwc3_gadget_ep_cleanup_completed_requests(struct dwc3_ep *dep,
 	/*
 	 * Our endpoint might get disabled by another thread during
 	 * dwc3_gadget_giveback(). If that happens, we're just gonna return 1
-	 * early on so DWC3_EP_BUSY flag gets cleared
+	 * early.
 	 */
 	if (!dep->endpoint.desc)
 		return 1;
@@ -2432,18 +2428,13 @@ static void dwc3_gadget_endpoint_transfer_in_progress(struct dwc3_ep *dep,
 {
 	struct dwc3		*dwc = dep->dwc;
 	unsigned		status = 0;
-	int			clean_busy;
 
 	dwc3_gadget_endpoint_frame_from_event(dep, event);
 
 	if (event->status & DEPEVT_STATUS_BUSERR)
 		status = -ECONNRESET;
 
-	clean_busy = dwc3_gadget_ep_cleanup_completed_requests(dep, event,
-			status);
-	if (clean_busy && (!dep->endpoint.desc ||
-				usb_endpoint_xfer_isoc(dep->endpoint.desc)))
-		dep->flags &= ~DWC3_EP_BUSY;
+	dwc3_gadget_ep_cleanup_completed_requests(dep, event, status);
 
 	/*
 	 * WORKAROUND: This is the 2nd half of U1/U2 -> U0 workaround.
@@ -2612,7 +2603,6 @@ static void dwc3_stop_active_transfer(struct dwc3_ep *dep, bool force)
 	ret = dwc3_send_gadget_ep_cmd(dep, cmd, &params);
 	WARN_ON_ONCE(ret);
 	dep->resource_index = 0;
-	dep->flags &= ~DWC3_EP_BUSY;
 
 	if (dwc3_is_usb31(dwc) || dwc->revision < DWC3_REVISION_310A) {
 		dep->flags |= DWC3_EP_END_TRANSFER_PENDING;

drivers/usb/dwc3/trace.h

@@ -311,7 +311,7 @@ DECLARE_EVENT_CLASS(dwc3_log_ep,
 		__entry->flags & DWC3_EP_ENABLED ? 'E' : 'e',
 		__entry->flags & DWC3_EP_STALL ? 'S' : 's',
 		__entry->flags & DWC3_EP_WEDGE ? 'W' : 'w',
-		__entry->flags & DWC3_EP_BUSY ? 'B' : 'b',
+		__entry->flags & DWC3_EP_TRANSFER_STARTED ? 'B' : 'b',
 		__entry->flags & DWC3_EP_PENDING_REQUEST ? 'P' : 'p',
 		__entry->flags & DWC3_EP_MISSED_ISOC ? 'M' : 'm',
 		__entry->flags & DWC3_EP_END_TRANSFER_PENDING ? 'E' : 'e',