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author | Alan Stern <stern@rowland.harvard.edu> | 2009-06-29 10:43:32 -0400 |
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committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-07-12 15:16:38 -0700 |
commit | cb88a1b887bb8908f6e00ce29e893ea52b074940 (patch) | |
tree | 198cba7974836d994cfc839b95242e8321702d5c /drivers/usb/host/ehci-hcd.c | |
parent | 87ea8c887905d8b13ae90b537117592ed027632a (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/host/ehci-hcd.c')
0 files changed, 0 insertions, 0 deletions