On Mon, 2013-09-02 at 13:25 +0200, Gerd Hoffmann wrote:
> xhci maintains a radix tree for each stream endpoint because it must
> be able to map a trb address to the stream ring. Each ring segment
> must be added to the ring for this to work. Currently xhci sticks
> only the first segment of each stream ring into the radix tree.
[]
> This patch adds a helper function to update the radix tree. It can
> both insert and remove ring segments. It loops over the segment list
> and handles all segments instead of just the first. It is called
> whenever an update is needed: When allocating a ring, when expanding
> a ring and when releasing a ring.
[]
> diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
[]
> @@ -601,6 +609,33 @@ static int xhci_test_radix_tree(struct xhci_hcd *xhci,
> * extended systems (where the DMA address can be bigger than 32-bits),
> * if we allow the PCI dma mask to be bigger than 32-bits. So don't do that.
> */
> +
> +int xhci_update_stream_ring(struct xhci_ring *ring, bool insert)
> +{
> + struct xhci_segment *seg;
> + unsigned long key;
> + bool present;
> + int ret;
> +
> + BUG_ON(ring->trb_address_map == NULL);
BUG_ON is really not nice. Maybe:
if (WARN_ON_ONCE(ring->trb_address_map == NULL))
return 0;
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