From 1624ae1c19e227096ba85bfc389d9b99cb6f7dde Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Thu, 6 May 2010 13:40:08 -0700 Subject: [PATCH] USB: xhci: Fix issue with set interface after stall. When the USB core installs a new interface, it unconditionally clears the halts on all the endpoints on the new interface. Usually the xHCI host needs to know when an endpoint is reset, so it can change its internal endpoint state. In this case, it doesn't care, because the endpoints were never halted in the first place. To avoid issuing a redundant Reset Endpoint command, the xHCI driver looks at xhci_virt_ep->stopped_td to determine if the endpoint was actually halted. However, the functions that handle the stall never set that variable to NULL after it dealt with the stall. So if an endpoint stalled and a Reset Endpoint command completed, and then the class driver tried to install a new alternate setting, the xHCI driver would access the old xhci_virt_ep->stopped_td pointer. A similar problem occurs if the endpoint has been stopped to cancel a transfer. Signed-off-by: Sarah Sharp Cc: stable Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 7 +++++++ drivers/usb/host/xhci.c | 2 ++ 2 files changed, 9 insertions(+) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 85d7e8f2085e..b520b37c0f36 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -578,6 +578,8 @@ static void handle_stopped_endpoint(struct xhci_hcd *xhci, /* Otherwise just ring the doorbell to restart the ring */ ring_ep_doorbell(xhci, slot_id, ep_index); } + ep->stopped_td = NULL; + ep->stopped_trb = NULL; /* * Drop the lock and complete the URBs in the cancelled TD list. @@ -1061,8 +1063,13 @@ static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci, ep->ep_state |= EP_HALTED; ep->stopped_td = td; ep->stopped_trb = event_trb; + xhci_queue_reset_ep(xhci, slot_id, ep_index); xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index); + + ep->stopped_td = NULL; + ep->stopped_trb = NULL; + xhci_ring_cmd_db(xhci); } diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 7e4277273908..077dfcd57dc9 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1438,6 +1438,8 @@ void xhci_endpoint_reset(struct usb_hcd *hcd, kfree(virt_ep->stopped_td); xhci_ring_cmd_db(xhci); } + virt_ep->stopped_td = NULL; + virt_ep->stopped_trb = NULL; spin_unlock_irqrestore(&xhci->lock, flags); if (ret) -- 2.20.1