From 863981e96738983919de841ec669e157e6bdaeb0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Sun, 11 Sep 2016 04:34:46 -0300
Subject: Linux-libre 4.7.1-gnu

---
 drivers/usb/dwc2/gadget.c    | 32 +++++++++++++++++++++++++++-----
 drivers/usb/dwc2/hcd.c       |  1 +
 drivers/usb/dwc2/hcd.h       |  1 +
 drivers/usb/dwc2/hcd_queue.c |  3 ++-
 drivers/usb/dwc2/platform.c  |  2 +-
 5 files changed, 32 insertions(+), 7 deletions(-)

(limited to 'drivers/usb/dwc2')

diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
index 818f15823..26cf09d0f 100644
--- a/drivers/usb/dwc2/gadget.c
+++ b/drivers/usb/dwc2/gadget.c
@@ -1018,7 +1018,7 @@ static int dwc2_hsotg_process_req_status(struct dwc2_hsotg *hsotg,
 	return 1;
 }
 
-static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value);
+static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now);
 
 /**
  * get_ep_head - return the first request on the endpoint
@@ -1094,7 +1094,7 @@ static int dwc2_hsotg_process_req_feature(struct dwc2_hsotg *hsotg,
 		case USB_ENDPOINT_HALT:
 			halted = ep->halted;
 
-			dwc2_hsotg_ep_sethalt(&ep->ep, set);
+			dwc2_hsotg_ep_sethalt(&ep->ep, set, true);
 
 			ret = dwc2_hsotg_send_reply(hsotg, ep0, NULL, 0);
 			if (ret) {
@@ -2425,6 +2425,9 @@ static irqreturn_t dwc2_hsotg_irq(int irq, void *pw)
 	u32 gintsts;
 	u32 gintmsk;
 
+	if (!dwc2_is_device_mode(hsotg))
+		return IRQ_NONE;
+
 	spin_lock(&hsotg->lock);
 irq_retry:
 	gintsts = dwc2_readl(hsotg->regs + GINTSTS);
@@ -2631,7 +2634,10 @@ static int dwc2_hsotg_ep_enable(struct usb_ep *ep,
 		desc->wMaxPacketSize, desc->bInterval);
 
 	/* not to be called for EP0 */
-	WARN_ON(index == 0);
+	if (index == 0) {
+		dev_err(hsotg->dev, "%s: called for EP 0\n", __func__);
+		return -EINVAL;
+	}
 
 	dir_in = (desc->bEndpointAddress & USB_ENDPOINT_DIR_MASK) ? 1 : 0;
 	if (dir_in != hs_ep->dir_in) {
@@ -2942,8 +2948,13 @@ static int dwc2_hsotg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
  * dwc2_hsotg_ep_sethalt - set halt on a given endpoint
  * @ep: The endpoint to set halt.
  * @value: Set or unset the halt.
+ * @now: If true, stall the endpoint now. Otherwise return -EAGAIN if
+ *       the endpoint is busy processing requests.
+ *
+ * We need to stall the endpoint immediately if request comes from set_feature
+ * protocol command handler.
  */
-static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value)
+static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value, bool now)
 {
 	struct dwc2_hsotg_ep *hs_ep = our_ep(ep);
 	struct dwc2_hsotg *hs = hs_ep->parent;
@@ -2963,6 +2974,17 @@ static int dwc2_hsotg_ep_sethalt(struct usb_ep *ep, int value)
 		return 0;
 	}
 
+	if (hs_ep->isochronous) {
+		dev_err(hs->dev, "%s is Isochronous Endpoint\n", ep->name);
+		return -EINVAL;
+	}
+
+	if (!now && value && !list_empty(&hs_ep->queue)) {
+		dev_dbg(hs->dev, "%s request is pending, cannot halt\n",
+			ep->name);
+		return -EAGAIN;
+	}
+
 	if (hs_ep->dir_in) {
 		epreg = DIEPCTL(index);
 		epctl = dwc2_readl(hs->regs + epreg);
@@ -3014,7 +3036,7 @@ static int dwc2_hsotg_ep_sethalt_lock(struct usb_ep *ep, int value)
 	int ret = 0;
 
 	spin_lock_irqsave(&hs->lock, flags);
-	ret = dwc2_hsotg_ep_sethalt(ep, value);
+	ret = dwc2_hsotg_ep_sethalt(ep, value, false);
 	spin_unlock_irqrestore(&hs->lock, flags);
 
 	return ret;
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 1f6255131..2df3d04d2 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4703,6 +4703,7 @@ fail2:
 	spin_unlock_irqrestore(&hsotg->lock, flags);
 	urb->hcpriv = NULL;
 	kfree(qtd);
+	qtd = NULL;
 fail1:
 	if (qh_allocated) {
 		struct dwc2_qtd *qtd2, *qtd2_tmp;
diff --git a/drivers/usb/dwc2/hcd.h b/drivers/usb/dwc2/hcd.h
index 89fa26cb2..7758bfb64 100644
--- a/drivers/usb/dwc2/hcd.h
+++ b/drivers/usb/dwc2/hcd.h
@@ -552,6 +552,7 @@ static inline void dwc2_hcd_qtd_unlink_and_free(struct dwc2_hsotg *hsotg,
 {
 	list_del(&qtd->qtd_list_entry);
 	kfree(qtd);
+	qtd = NULL;
 }
 
 /* Descriptor DMA support functions */
diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c
index 7f634fd77..b5c7793a2 100644
--- a/drivers/usb/dwc2/hcd_queue.c
+++ b/drivers/usb/dwc2/hcd_queue.c
@@ -1709,7 +1709,8 @@ void dwc2_hcd_qh_unlink(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh)
 
 	dwc2_deschedule_periodic(hsotg, qh);
 	hsotg->periodic_qh_count--;
-	if (!hsotg->periodic_qh_count) {
+	if (!hsotg->periodic_qh_count &&
+	    hsotg->core_params->dma_desc_enable <= 0) {
 		intr_mask = dwc2_readl(hsotg->regs + GINTMSK);
 		intr_mask &= ~GINTSTS_SOF;
 		dwc2_writel(intr_mask, hsotg->regs + GINTMSK);
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 88629bed6..fc6f5251d 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -562,7 +562,7 @@ static int dwc2_driver_probe(struct platform_device *dev)
 
 	retval = dwc2_get_dr_mode(hsotg);
 	if (retval)
-		return retval;
+		goto error;
 
 	/*
 	 * Reset before dwc2_get_hwparams() then it could get power-on real
-- 
cgit v1.2.3-54-g00ecf