summaryrefslogtreecommitdiffstats
path: root/drivers/usb
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/ehci-dbg.c2
-rw-r--r--drivers/usb/host/ehci-hcd.c13
-rw-r--r--drivers/usb/host/ehci-hub.c3
-rw-r--r--drivers/usb/host/ehci-q.c8
-rw-r--r--drivers/usb/host/ehci-sched.c8
-rw-r--r--drivers/usb/host/ehci.h7
6 files changed, 23 insertions, 18 deletions
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index 76120957d60a..f0c00de035ef 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -706,6 +706,8 @@ static const char *rh_state_string(struct ehci_hcd *ehci)
return "suspended";
case EHCI_RH_RUNNING:
return "running";
+ case EHCI_RH_STOPPING:
+ return "stopping";
}
return "?";
}
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 8b75e4279a47..bc94822f4c5d 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -357,10 +357,8 @@ static void ehci_quiesce (struct ehci_hcd *ehci)
{
u32 temp;
-#ifdef DEBUG
if (ehci->rh_state != EHCI_RH_RUNNING)
- BUG ();
-#endif
+ return;
/* wait for any schedule enables/disables to take effect */
temp = (ehci->command << 10) & (STS_ASS | STS_PSS);
@@ -494,6 +492,7 @@ static void ehci_shutdown(struct usb_hcd *hcd)
del_timer_sync(&ehci->iaa_watchdog);
spin_lock_irq(&ehci->lock);
+ ehci->rh_state = EHCI_RH_STOPPING;
ehci_silence_controller(ehci);
spin_unlock_irq(&ehci->lock);
}
@@ -562,8 +561,7 @@ static void ehci_stop (struct usb_hcd *hcd)
del_timer_sync(&ehci->iaa_watchdog);
spin_lock_irq(&ehci->lock);
- if (ehci->rh_state == EHCI_RH_RUNNING)
- ehci_quiesce (ehci);
+ ehci_quiesce(ehci);
ehci_silence_controller(ehci);
ehci_reset (ehci);
@@ -951,6 +949,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd)
/* PCI errors [4.15.2.4] */
if (unlikely ((status & STS_FATAL) != 0)) {
ehci_err(ehci, "fatal error\n");
+ ehci->rh_state = EHCI_RH_STOPPING;
dbg_cmd(ehci, "fatal", cmd);
dbg_status(ehci, "fatal", status);
ehci_halt(ehci);
@@ -1026,7 +1025,7 @@ static int ehci_urb_enqueue (
static void unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
{
/* failfast */
- if (ehci->rh_state != EHCI_RH_RUNNING && ehci->async_unlink)
+ if (ehci->rh_state < EHCI_RH_RUNNING && ehci->async_unlink)
end_unlink_async(ehci);
/* If the QH isn't linked then there's nothing we can do
@@ -1148,7 +1147,7 @@ rescan:
goto idle_timeout;
}
- if (ehci->rh_state != EHCI_RH_RUNNING)
+ if (ehci->rh_state < EHCI_RH_RUNNING)
qh->qh_state = QH_STATE_IDLE;
switch (qh->qh_state) {
case QH_STATE_LINKED:
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 77d3324b4b28..fb1b99e74937 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -227,8 +227,7 @@ static int ehci_bus_suspend (struct usb_hcd *hcd)
}
/* stop schedules, clean any completed work */
- if (ehci->rh_state == EHCI_RH_RUNNING)
- ehci_quiesce (ehci);
+ ehci_quiesce(ehci);
ehci_work(ehci);
/* Unlike other USB host controller types, EHCI doesn't have
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 5193612c96ea..285d5a0f3f70 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -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) {
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 027df3de2dc9..3429b8a33c58 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -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;
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 475f23e10bbf..9e8e82ecce58 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -62,10 +62,15 @@ struct ehci_stats {
#define EHCI_MAX_ROOT_PORTS 15 /* see HCS_N_PORTS */
+/*
+ * ehci_rh_state values of EHCI_RH_RUNNING or above mean that the
+ * controller may be doing DMA. Lower values mean there's no DMA.
+ */
enum ehci_rh_state {
EHCI_RH_HALTED,
EHCI_RH_SUSPENDED,
- EHCI_RH_RUNNING
+ EHCI_RH_RUNNING,
+ EHCI_RH_STOPPING
};
struct ehci_hcd { /* one per controller */
OpenPOWER on IntegriCloud