From: Felipe Balbi <felipe.balbi@linux.intel.com>
Date: Wed, 13 Apr 2016 13:44:39 +0000 (+0300)
Subject: usb: dwc3: gadget: add a per-endpoint request queue lock
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=74674cbf858ff6a83c3f06f4ab0ffa5d3c91bf0b;p=linux-beck.git

usb: dwc3: gadget: add a per-endpoint request queue lock

This will allow us to process several endpoints at a
time by making sure that we lock only shared
resources.

Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
---

diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 94b9fd2d583e..484bb5d8261c 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -482,6 +482,7 @@ struct dwc3_event_buffer {
  * @endpoint: usb endpoint
  * @pending_list: list of pending requests for this endpoint
  * @started_list: list of started requests on this endpoint
+ * @lock: spinlock for endpoint request queue traversal
  * @regs: pointer to first endpoint register
  * @trb_pool: array of transaction buffers
  * @trb_pool_dma: dma address of @trb_pool
@@ -504,6 +505,7 @@ struct dwc3_ep {
 	struct list_head	pending_list;
 	struct list_head	started_list;
 
+	spinlock_t		lock;
 	void __iomem		*regs;
 
 	struct dwc3_trb		*trb_pool;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 194775184a58..8b932033d29b 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1845,6 +1845,7 @@ static int dwc3_gadget_init_hw_endpoints(struct dwc3 *dwc,
 				(epnum & 1) ? "in" : "out");
 
 		dep->endpoint.name = dep->name;
+		spin_lock_init(&dep->lock);
 
 		dwc3_trace(trace_dwc3_gadget, "initializing %s", dep->name);