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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-q.c
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@@ -433,7 +433,7 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
/* stop scanning when we reach qtds the hc is using */
} else if (likely (!stopped
&& ehci->rh_state == EHCI_RH_RUNNING)) {
&& ehci->rh_state >= EHCI_RH_RUNNING)) {
break;
/* scan the whole queue for unlinks whenever it stops */
@@ -441,7 +441,7 @@ qh_completions (struct ehci_hcd *ehci, struct ehci_qh *qh)
stopped = 1;
/* cancel everything if we halt, suspend, etc */
if (ehci->rh_state != EHCI_RH_RUNNING)
if (ehci->rh_state < EHCI_RH_RUNNING)
last_status = -ESHUTDOWN;
/* this qtd is active; skip it unless a previous qtd
@@ -1241,7 +1241,7 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
wmb ();
/* If the controller isn't running, we don't have to wait for it */
if (unlikely(ehci->rh_state != EHCI_RH_RUNNING)) {
if (unlikely(ehci->rh_state < EHCI_RH_RUNNING)) {
/* if (unlikely (qh->unlink_next != 0))
* this will recurse, probably not much
*/
@@ -1263,7 +1263,7 @@ static void scan_async (struct ehci_hcd *ehci)
enum ehci_timer_action action = TIMER_IO_WATCHDOG;
timer_action_done (ehci, TIMER_ASYNC_SHRINK);
stopped = (ehci->rh_state != EHCI_RH_RUNNING);
stopped = (ehci->rh_state < EHCI_RH_RUNNING);
ehci->qh_scan_next = ehci->async->qh_next.qh;
while (ehci->qh_scan_next) {