USB: xhci: Endpoint representation refactoring.

The xhci_ring structure contained information that is really related to an
endpoint, not a ring.  This will cause problems later when endpoint
streams are supported and there are multiple rings per endpoint.

Move the endpoint state and cancellation information into a new virtual
endpoint structure, xhci_virt_ep.  The list of TRBs to be cancelled should
be per endpoint, not per ring, for easy access.  There can be only one TRB
that the endpoint stopped on after a stop endpoint command (even with
streams enabled); move the stopped TRB information into the new virtual
endpoint structure.  Also move the 31 endpoint rings and temporary ring
storage from the virtual device structure (xhci_virt_device) into the
virtual endpoint structure (xhci_virt_ep).

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 15 insertions, 10 deletions

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 55920b39d106..75458ecc8eab 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -144,7 +144,6 @@ static struct xhci_ring *xhci_ring_alloc(struct xhci_hcd *xhci,
                 return 0;
 
         INIT_LIST_HEAD(&ring->td_list);
-        INIT_LIST_HEAD(&ring->cancelled_td_list);
         if (num_segs == 0)
                 return ring;
 
@@ -265,8 +264,8 @@ void xhci_free_virt_device(struct xhci_hcd *xhci, int slot_id)
                 return;
 
         for (i = 0; i < 31; ++i)
-                if (dev->ep_rings[i])
-                        xhci_ring_free(xhci, dev->ep_rings[i]);
+                if (dev->eps[i].ring)
+                        xhci_ring_free(xhci, dev->eps[i].ring);
 
         if (dev->in_ctx)
                 xhci_free_container_ctx(xhci, dev->in_ctx);
@@ -281,6 +280,7 @@ int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
                 struct usb_device *udev, gfp_t flags)
 {
         struct xhci_virt_device *dev;
+        int i;
 
         /* Slot ID 0 is reserved */
         if (slot_id == 0 || xhci->devs[slot_id]) {
@@ -309,9 +309,13 @@ int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
         xhci_dbg(xhci, "Slot %d input ctx = 0x%llx (dma)\n", slot_id,
                         (unsigned long long)dev->in_ctx->dma);
 
+        /* Initialize the cancellation list for each endpoint */
+        for (i = 0; i < 31; i++)
+                INIT_LIST_HEAD(&dev->eps[i].cancelled_td_list);
+
         /* Allocate endpoint 0 ring */
-        dev->ep_rings[0] = xhci_ring_alloc(xhci, 1, true, flags);
-        if (!dev->ep_rings[0])
+        dev->eps[0].ring = xhci_ring_alloc(xhci, 1, true, flags);
+        if (!dev->eps[0].ring)
                 goto fail;
 
         init_completion(&dev->cmd_completion);
@@ -428,8 +432,8 @@ int xhci_setup_addressable_virt_dev(struct xhci_hcd *xhci, struct usb_device *ud
         ep0_ctx->ep_info2 |= ERROR_COUNT(3);
 
         ep0_ctx->deq =
-                dev->ep_rings[0]->first_seg->dma;
-        ep0_ctx->deq |= dev->ep_rings[0]->cycle_state;
+                dev->eps[0].ring->first_seg->dma;
+        ep0_ctx->deq |= dev->eps[0].ring->cycle_state;
 
         /* Steps 7 and 8 were done in xhci_alloc_virt_device() */
 
@@ -539,10 +543,11 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
         ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, ep_index);
 
         /* Set up the endpoint ring */
-        virt_dev->new_ep_rings[ep_index] = xhci_ring_alloc(xhci, 1, true, mem_flags);
-        if (!virt_dev->new_ep_rings[ep_index])
+        virt_dev->eps[ep_index].new_ring =
+                xhci_ring_alloc(xhci, 1, true, mem_flags);
+        if (!virt_dev->eps[ep_index].new_ring)
                 return -ENOMEM;
-        ep_ring = virt_dev->new_ep_rings[ep_index];
+        ep_ring = virt_dev->eps[ep_index].new_ring;
         ep_ctx->deq = ep_ring->first_seg->dma | ep_ring->cycle_state;
 
         ep_ctx->ep_info = xhci_get_endpoint_interval(udev, ep);