usb: dwc2: gadget: kill ep0 requests before reinitializing core

Make sure there are no requests pending on ep0 before reinitializing
core. Otherwise, dwc2_hsotg_enqueue_setup will fail afterwards.

Also, take hsotg->lock before calling
dwc2_hsotg_core_init_disconnected() from dwc2_conn_id_status_change()
as dwc2_hsotg_complete_request() expect lock to be held.

Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@intel.com>
Tested-by: Robert Baldyga <r.baldyga@samsung.com>
Tested-by: Dinh Nguyen <dinguyen@opensource.altera.com>
Tested-by: John Youn <johnyoun@synopsys.com>
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc2/gadget.c

@@ -2287,6 +2287,9 @@ void dwc2_hsotg_core_init_disconnected(struct dwc2_hsotg *hsotg,
 {
 	u32 val;
 
+	/* Kill any ep0 requests as controller will be reinitialized */
+	kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET);
+
 	if (!is_usb_reset)
 		if (dwc2_hsotg_corereset(hsotg))
 			return;
@@ -2515,9 +2518,6 @@ irq_retry:
 			if (time_after(jiffies, hsotg->last_rst +
 				       msecs_to_jiffies(200))) {
 
-				kill_all_requests(hsotg, hsotg->eps_out[0],
-							  -ECONNRESET);
-
 				dwc2_hsotg_core_init_disconnected(hsotg, true);
 			}
 		}
@@ -3296,8 +3296,6 @@ static int dwc2_hsotg_vbus_session(struct usb_gadget *gadget, int is_active)
 		if (hsotg->lx_state == DWC2_L2)
 			dwc2_exit_hibernation(hsotg, false);
 
-		/* Kill any ep0 requests as controller will be reinitialized */
-		kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET);
 		dwc2_hsotg_core_init_disconnected(hsotg, false);
 		if (hsotg->enabled)
 			dwc2_hsotg_core_connect(hsotg);

drivers/usb/dwc2/hcd.c

@@ -1355,6 +1355,7 @@ static void dwc2_conn_id_status_change(struct work_struct *work)
 						wf_otg);
 	u32 count = 0;
 	u32 gotgctl;
+	unsigned long flags;
 
 	dev_dbg(hsotg->dev, "%s()\n", __func__);
 
@@ -1382,7 +1383,9 @@ static void dwc2_conn_id_status_change(struct work_struct *work)
 		hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 		dwc2_core_init(hsotg, false, -1);
 		dwc2_enable_global_interrupts(hsotg);
+		spin_lock_irqsave(&hsotg->lock, flags);
 		dwc2_hsotg_core_init_disconnected(hsotg, false);
+		spin_unlock_irqrestore(&hsotg->lock, flags);
 		dwc2_hsotg_core_connect(hsotg);
 	} else {
 		/* A-Device connector (Host Mode) */