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xHCI: Allocate 2 segments for transfer ring 

Allocate 2 segments for transfer ring by default, so we can expand the ring
when the enqueue pointer and dequeue pointer are in different segments.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Paul Zimmerman <Paul.Zimmerman@synopsys.com>
This commit is contained in:
Andiry Xu 2012-03-05 17:49:39 +08:00 committed by Sarah Sharp
parent 8dfec6140f
commit 2fdcd47b69
1 changed files with 3 additions and 3 deletions
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6
drivers/usb/host/xhci-mem.c
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@ -642,7 +642,7 @@ struct xhci_stream_info *xhci_alloc_stream_info(struct xhci_hcd *xhci,
*/
for (cur_stream = 1; cur_stream < num_streams; cur_stream++) {
stream_info->stream_rings[cur_stream] =
xhci_ring_alloc(xhci, 1, 1, TYPE_STREAM, mem_flags);
xhci_ring_alloc(xhci, 2, 1, TYPE_STREAM, mem_flags);
cur_ring = stream_info->stream_rings[cur_stream];
if (!cur_ring)
goto cleanup_rings;
@ -976,7 +976,7 @@ int xhci_alloc_virt_device(struct xhci_hcd *xhci, int slot_id,
}
/* Allocate endpoint 0 ring */
dev->eps[0].ring = xhci_ring_alloc(xhci, 1, 1, TYPE_CTRL, flags);
dev->eps[0].ring = xhci_ring_alloc(xhci, 2, 1, TYPE_CTRL, flags);
if (!dev->eps[0].ring)
goto fail;
@ -1423,7 +1423,7 @@ int xhci_endpoint_init(struct xhci_hcd *xhci,
type = usb_endpoint_type(&ep->desc);
/* Set up the endpoint ring */
virt_dev->eps[ep_index].new_ring =
xhci_ring_alloc(xhci, 1, 1, type, mem_flags);
xhci_ring_alloc(xhci, 2, 1, type, mem_flags);
if (!virt_dev->eps[ep_index].new_ring) {
/* Attempt to use the ring cache */
if (virt_dev->num_rings_cached == 0)