aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/core/hcd.h
diff options
context:
space:
mode:
authorAlan Stern <stern@rowland.harvard.edu>2009-06-29 10:43:32 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-07-12 15:16:38 -0700
commitcb88a1b887bb8908f6e00ce29e893ea52b074940 (patch)
tree198cba7974836d994cfc839b95242e8321702d5c /drivers/usb/core/hcd.h
parent87ea8c887905d8b13ae90b537117592ed027632a (diff)
USB: fix the clear_tt_buffer interface
This patch (as1255) updates the interface for calling usb_hub_clear_tt_buffer(). Even the name of the function is changed! When an async URB (i.e., Control or Bulk) going through a high-speed hub to a non-high-speed device is cancelled or fails, the hub's Transaction Translator buffer may be left busy still trying to complete the transaction. The buffer has to be cleared; that's what usb_hub_clear_tt_buffer() does. It isn't safe to send any more URBs to the same endpoint until the TT buffer is fully clear. Therefore the HCD needs to be told when the Clear-TT-Buffer request has finished. This patch adds a callback method to struct hc_driver for that purpose, and makes the hub driver invoke the callback at the proper time. The patch also changes a couple of names; "hub_tt_kevent" and "tt.kevent" now look rather antiquated. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hcd.h')
-rw-r--r--drivers/usb/core/hcd.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index d397ecfd5b1..ec5c67ea07b 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -227,6 +227,10 @@ struct hc_driver {
/* has a port been handed over to a companion? */
int (*port_handed_over)(struct usb_hcd *, int);
+ /* CLEAR_TT_BUFFER completion callback */
+ void (*clear_tt_buffer_complete)(struct usb_hcd *,
+ struct usb_host_endpoint *);
+
/* xHCI specific functions */
/* Called by usb_alloc_dev to alloc HC device structures */
int (*alloc_dev)(struct usb_hcd *, struct usb_device *);