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 94b9fd2..484bb5d 100644 (file)
--- 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 1947751..8b93203 100644 (file)
--- 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);