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xhci: don't use the same variable for stopped and halted rings current TD

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Endpoints halted on errors, and endpoints stopped manually both used
the same ep->stopped_td to store the halted or stopped td. this causes
confusion and possible races.

There is no longer a need to use the ep->stopped_td variable to store
the halted TD. A halted endpoint is handled immediately and we can pass
it to the handling function directly.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2014-11-27 18:19:16 +02:00 committed by Greg Kroah-Hartman
parent 4801d4ea55
commit d97b4f8d69
3 changed files with 6 additions and 10 deletions
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6
drivers/usb/host/xhci-ring.c
View File

@ -716,8 +716,6 @@ remove_finished_td:
ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
}
/* Clear stopped_td if endpoint is not halted */
if (!(ep->ep_state & EP_HALTED))
ep->stopped_td = NULL;
/*
@ -1732,13 +1730,11 @@ static void xhci_cleanup_halted_endpoint(struct xhci_hcd *xhci,
return;
ep->ep_state |= EP_HALTED;
ep->stopped_td = td;
ep->stopped_stream = stream_id;
xhci_queue_reset_ep(xhci, command, slot_id, ep_index);
xhci_cleanup_stalled_ring(xhci, td->urb->dev, ep_index);
xhci_cleanup_stalled_ring(xhci, ep_index, td);
ep->stopped_td = NULL;
ep->stopped_stream = 0;
xhci_ring_cmd_db(xhci);

6
drivers/usb/host/xhci.c
View File

@ -2912,10 +2912,11 @@ static void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
}
void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
struct usb_device *udev, unsigned int ep_index)
unsigned int ep_index, struct xhci_td *td)
{
struct xhci_dequeue_state deq_state;
struct xhci_virt_ep *ep;
struct usb_device *udev = td->urb->dev;
xhci_dbg_trace(xhci, trace_xhci_dbg_reset_ep,
"Cleaning up stalled endpoint ring");
@ -2924,8 +2925,7 @@ void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
* or it will attempt to resend it on the next doorbell ring.
*/
xhci_find_new_dequeue_state(xhci, udev->slot_id,
ep_index, ep->stopped_stream, ep->stopped_td,
&deq_state);
ep_index, ep->stopped_stream, td, &deq_state);
if (!deq_state.new_deq_ptr || !deq_state.new_deq_seg)
return;

2
drivers/usb/host/xhci.h
View File

@ -1825,7 +1825,7 @@ void xhci_queue_new_dequeue_state(struct xhci_hcd *xhci,
unsigned int stream_id,
struct xhci_dequeue_state *deq_state);
void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
struct usb_device *udev, unsigned int ep_index);
unsigned int ep_index, struct xhci_td *td);
void xhci_queue_config_ep_quirk(struct xhci_hcd *xhci,
unsigned int slot_id, unsigned int ep_index,
struct xhci_dequeue_state *deq_state);