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USB: EHCI: add new root-hub state: STOPPING

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This patch (as1571) adds a new state for ehci-hcd's root hubs:
EHCI_RH_STOPPING.  This value is used at times when the root hub is
being stopped and we don't know whether or not the hardware has
finished all its DMA yet.

Although the purpose may not be apparent, this distinction will come
in useful later on.  Future patches will avoid actions that depend on
the root hub being operational (like turning on the async or periodic
schedules) when they see the state is EHCI_RH_STOPPING.

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 11:21:48 -04:00 • committed by Greg Kroah-Hartman
parent 2f5bb665ba
commit c0c53dbc32
6 changed files with 23 additions and 18 deletions
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8
drivers/usb/host/ehci-sched.c
View file

@ -2299,7 +2299,7 @@ scan_periodic (struct ehci_hcd *ehci)
* Touches as few pages as possible: cache-friendly.
*/
now_uframe = ehci->next_uframe;
if (ehci->rh_state == EHCI_RH_RUNNING) {
if (ehci->rh_state >= EHCI_RH_RUNNING) {
clock = ehci_read_frame_index(ehci);
clock_frame = (clock >> 3) & (ehci->periodic_size - 1);
} else {
@ -2334,7 +2334,7 @@ restart:
union ehci_shadow temp;
int live;
live = (ehci->rh_state == EHCI_RH_RUNNING);
live = (ehci->rh_state >= EHCI_RH_RUNNING);
switch (hc32_to_cpu(ehci, type)) {
case Q_TYPE_QH:
/* handle any completions */
@ -2459,7 +2459,7 @@ restart:
* We can't advance our scan without collecting the ISO
* transfers that are still pending in this frame.
*/
if (incomplete && ehci->rh_state == EHCI_RH_RUNNING) {
if (incomplete && ehci->rh_state >= EHCI_RH_RUNNING) {
ehci->next_uframe = now_uframe;
break;
}
@ -2475,7 +2475,7 @@ restart:
if (now_uframe == clock) {
unsigned now;
if (ehci->rh_state != EHCI_RH_RUNNING
if (ehci->rh_state < EHCI_RH_RUNNING
|| ehci->periodic_sched == 0)
break;
ehci->next_uframe = now_uframe;