USB: xhci - also free streams when resetting devices

Currently, when resetting a device, xHCI driver disables all but one
endpoints and frees their rings, but leaves alone any streams that
might have been allocated. Later, when users try to free allocated
streams, we oops in xhci_setup_no_streams_ep_input_ctx() because
ep->ring is NULL.

Let's free not only rings but also stream data as well, so that
calling free_streams() on a device that was reset will be safe.

This should be queued for stable trees back to 2.6.35.

Reviewed-by: Micah Elizabeth Scott <micah@vmware.com>
Signed-off-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: stable@kernel.org

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 196e0181b2ed6e5f56c0a8ea2330a3399c8f739b..48706c0d6577b074bdbef4a5cd69a671cad9e7a7 100644 (file)
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2386,10 +2386,18 @@ int xhci_discover_or_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
        /* Everything but endpoint 0 is disabled, so free or cache the rings. */
        last_freed_endpoint = 1;
        for (i = 1; i < 31; ++i) {
-               if (!virt_dev->eps[i].ring)
-                       continue;
-               xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
-               last_freed_endpoint = i;
+               struct xhci_virt_ep *ep = &virt_dev->eps[i];
+
+               if (ep->ep_state & EP_HAS_STREAMS) {
+                       xhci_free_stream_info(xhci, ep->stream_info);
+                       ep->stream_info = NULL;
+                       ep->ep_state &= ~EP_HAS_STREAMS;
+               }
+
+               if (ep->ring) {
+                       xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
+                       last_freed_endpoint = i;
+               }
        }
        xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
        xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);