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authorSarah Sharp <sarah.a.sharp@linux.intel.com>2009-12-09 15:59:01 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2010-03-02 14:53:08 -0800
commit412566bd716397e28e81fc9b20804bc6a6daf14d (patch)
tree4013aaa1eda796f8dedea243167f3f4811d211b4 /drivers/usb/host/xhci-mem.c
parentc01591bd6ece72e1c099cbc25ed812e1add579dc (diff)
USB: xhci: Refactor code to free or cache endpoint rings.
Refactor out the code to cache or free endpoint rings from recently dropped or disabled endpoints. This code will be used by a new function to reset a device and disable all endpoints except control endpoint 0. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/xhci-mem.c')
-rw-r--r--drivers/usb/host/xhci-mem.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index bffcef7a554..1f1f8a0f2e6 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -198,6 +198,31 @@ fail:
return 0;
}
+void xhci_free_or_cache_endpoint_ring(struct xhci_hcd *xhci,
+ struct xhci_virt_device *virt_dev,
+ unsigned int ep_index)
+{
+ int rings_cached;
+
+ rings_cached = virt_dev->num_rings_cached;
+ if (rings_cached < XHCI_MAX_RINGS_CACHED) {
+ virt_dev->num_rings_cached++;
+ rings_cached = virt_dev->num_rings_cached;
+ virt_dev->ring_cache[rings_cached] =
+ virt_dev->eps[ep_index].ring;
+ xhci_dbg(xhci, "Cached old ring, "
+ "%d ring%s cached\n",
+ rings_cached,
+ (rings_cached > 1) ? "s" : "");
+ } else {
+ xhci_ring_free(xhci, virt_dev->eps[ep_index].ring);
+ xhci_dbg(xhci, "Ring cache full (%d rings), "
+ "freeing ring\n",
+ virt_dev->num_rings_cached);
+ }
+ virt_dev->eps[ep_index].ring = NULL;
+}
+
/* Zero an endpoint ring (except for link TRBs) and move the enqueue and dequeue
* pointers to the beginning of the ring.
*/