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USB: EHCI: add pointer to end of async-unlink list

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This patch (as1570) adds a pointer for the end of ehci-hcd's
async-unlink list.  The list (which is actually a queue) is singly
linked, so having a pointer to its end makes adding new entries easier
-- there's no longer any need to scan through the whole list.

In principle it could be changed to a standard doubly-linked list.  It
turns out that doing so actually makes the code less clear, so I'm
leaving it as is.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern 2012-07-11 11:21:43 -04:00 committed by Greg Kroah-Hartman
parent 99ac5b1e95
commit 2f5bb665ba
3 changed files with 5 additions and 7 deletions
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9
drivers/usb/host/ehci-hcd.c
View File

@ -1041,14 +1041,9 @@ static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
/* defer till later if busy */
if (ehci->async_unlink) {
struct ehci_qh *last;
for (last = ehci->async_unlink;
last->unlink_next;
last = last->unlink_next)
continue;
qh->qh_state = QH_STATE_UNLINK_WAIT;
last->unlink_next = qh;
ehci->async_unlink_last->unlink_next = qh;
ehci->async_unlink_last = qh;
/* start IAA cycle */
} else

2
drivers/usb/host/ehci-q.c
View File

@ -1227,6 +1227,8 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
qh->qh_state = QH_STATE_UNLINK;
ehci->async_unlink = qh;
if (!qh->unlink_next)
ehci->async_unlink_last = qh;
prev = ehci->async;
while (prev->qh_next.qh != qh)

1
drivers/usb/host/ehci.h
View File

@ -82,6 +82,7 @@ struct ehci_hcd { /* one per controller */
struct ehci_qh *async;
struct ehci_qh *dummy; /* For AMD quirk use */
struct ehci_qh *async_unlink;
struct ehci_qh *async_unlink_last;
struct ehci_qh *qh_scan_next;
unsigned scanning : 1;