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[PATCH] UHCI: Remove non-iso TDs as they are used

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This patch (as680) frees non-isochronous TDs as they are used, rather
than all at once when an URB is complete.  Although not a terribly
important change in itself, it opens the door to a later enhancement
that will reduce storage requirements by allocating only a limited
number of TDs at any time for each endpoint queue.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern
2006-05-12 11:19:19 -04:00
committed by Greg Kroah-Hartman
parent b1869000a6
commit 59e29ed91c
3 changed files with 45 additions and 39 deletions
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5
drivers/usb/host/uhci-hcd.h
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@ -129,6 +129,7 @@ struct uhci_qh {
struct list_head queue; /* Queue of urbps for this QH */
struct uhci_qh *skel; /* Skeleton for this QH */
struct uhci_td *dummy_td; /* Dummy TD to end the queue */
struct uhci_td *post_td; /* Last TD completed */
unsigned int unlink_frame; /* When the QH was unlinked */
int state; /* QH_STATE_xxx; see above */
@ -136,7 +137,7 @@ struct uhci_qh {
unsigned int initial_toggle:1; /* Endpoint's current toggle value */
unsigned int needs_fixup:1; /* Must fix the TD toggle values */
unsigned int is_stopped:1; /* Queue was stopped by an error */
unsigned int is_stopped:1; /* Queue was stopped by error/unlink */
} __attribute__((aligned(16)));
/*
@ -456,8 +457,6 @@ struct urb_priv {
struct list_head td_list;
unsigned fsbr : 1; /* URB turned on FSBR */
unsigned short_transfer : 1; /* URB got a short transfer, no
* need to rescan */
};