USB: convert usb_hcd bitfields into atomic flags
This patch (as1393) converts several of the single-bit fields in
struct usb_hcd to atomic flags. This is for safety's sake; not all
CPUs can update bitfield values atomically, and these flags are used
in multiple contexts.
The flag fields that are set only during registration or removal can
remain as they are, since non-atomic accesses at those times will not
cause any problems.
(Strictly speaking, the authorized_default flag should become atomic
as well. I didn't bother with it because it gets changed only via
sysfs. It can be done later, if anyone wants.)
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index df5546b..4498efb 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -712,7 +712,7 @@
spin_lock_irqsave (&ehci->lock, flags);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
size = scnprintf (next, size,
"bus %s, device %s\n"
"%s\n"
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index 8697ad19..2a19336 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -642,7 +642,6 @@
u32 hcc_params;
hcd->uses_new_polling = 1;
- hcd->poll_rh = 0;
/* EHCI spec section 4.1 */
if ((retval = ehci_reset(ehci)) != 0) {
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 84e792d..0931f5a 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -316,7 +316,7 @@
if (time_before (jiffies, ehci->next_statechange))
msleep(5);
spin_lock_irq (&ehci->lock);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
spin_unlock_irq(&ehci->lock);
return -ESHUTDOWN;
}
diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 11a79c4..233c288 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -1126,8 +1126,7 @@
#endif
spin_lock_irqsave (&ehci->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &ehci_to_hcd(ehci)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
rc = -ESHUTDOWN;
goto done;
}
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 805ec63..d640346 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -880,8 +880,7 @@
spin_lock_irqsave (&ehci->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &ehci_to_hcd(ehci)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
status = -ESHUTDOWN;
goto done_not_linked;
}
@@ -1815,8 +1814,7 @@
/* schedule ... need to lock */
spin_lock_irqsave (&ehci->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &ehci_to_hcd(ehci)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
status = -ESHUTDOWN;
goto done_not_linked;
}
@@ -2201,8 +2199,7 @@
/* schedule ... need to lock */
spin_lock_irqsave (&ehci->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &ehci_to_hcd(ehci)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(ehci_to_hcd(ehci)))) {
status = -ESHUTDOWN;
goto done_not_linked;
}
diff --git a/drivers/usb/host/hwa-hc.c b/drivers/usb/host/hwa-hc.c
index 35742f8..9bfac65 100644
--- a/drivers/usb/host/hwa-hc.c
+++ b/drivers/usb/host/hwa-hc.c
@@ -159,7 +159,7 @@
goto error_set_cluster_id;
usb_hcd->uses_new_polling = 1;
- usb_hcd->poll_rh = 1;
+ set_bit(HCD_FLAG_POLL_RH, &usb_hcd->flags);
usb_hcd->state = HC_STATE_RUNNING;
result = 0;
out:
@@ -776,7 +776,7 @@
goto error_alloc;
}
usb_hcd->wireless = 1;
- usb_hcd->flags |= HCD_FLAG_SAW_IRQ;
+ set_bit(HCD_FLAG_SAW_IRQ, &usb_hcd->flags);
wusbhc = usb_hcd_to_wusbhc(usb_hcd);
hwahc = container_of(wusbhc, struct hwahc, wusbhc);
hwahc_init(hwahc);
diff --git a/drivers/usb/host/isp1760-hcd.c b/drivers/usb/host/isp1760-hcd.c
index dbcafa2..d1a3dfc 100644
--- a/drivers/usb/host/isp1760-hcd.c
+++ b/drivers/usb/host/isp1760-hcd.c
@@ -482,7 +482,6 @@
u32 chipid;
hcd->uses_new_polling = 1;
- hcd->poll_rh = 0;
hcd->state = HC_STATE_RUNNING;
isp1760_enable_interrupts(hcd);
@@ -1450,7 +1449,7 @@
epnum = urb->ep->desc.bEndpointAddress;
spin_lock_irqsave(&priv->lock, flags);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &priv_to_hcd(priv)->flags)) {
+ if (!HCD_HW_ACCESSIBLE(priv_to_hcd(priv))) {
rc = -ESHUTDOWN;
goto done;
}
diff --git a/drivers/usb/host/ohci-dbg.c b/drivers/usb/host/ohci-dbg.c
index 8ad2441..36abd2b 100644
--- a/drivers/usb/host/ohci-dbg.c
+++ b/drivers/usb/host/ohci-dbg.c
@@ -645,7 +645,7 @@
hcd->product_desc,
hcd_name);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
size -= scnprintf (next, size,
"SUSPENDED (no register access)\n");
goto done;
@@ -687,7 +687,7 @@
next += temp;
temp = scnprintf (next, size, "hub poll timer %s\n",
- ohci_to_hcd(ohci)->poll_rh ? "ON" : "off");
+ HCD_POLL_RH(ohci_to_hcd(ohci)) ? "ON" : "off");
size -= temp;
next += temp;
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 02864a2..c3b4ccc 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -212,7 +212,7 @@
spin_lock_irqsave (&ohci->lock, flags);
/* don't submit to a dead HC */
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
retval = -ENODEV;
goto fail;
}
@@ -685,7 +685,7 @@
}
/* use rhsc irqs after khubd is fully initialized */
- hcd->poll_rh = 1;
+ set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
hcd->uses_new_polling = 1;
/* start controller operations */
@@ -822,7 +822,7 @@
else if (ints & OHCI_INTR_RD) {
ohci_vdbg(ohci, "resume detect\n");
ohci_writel(ohci, OHCI_INTR_RD, ®s->intrstatus);
- hcd->poll_rh = 1;
+ set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
if (ohci->autostop) {
spin_lock (&ohci->lock);
ohci_rh_resume (ohci);
diff --git a/drivers/usb/host/ohci-hub.c b/drivers/usb/host/ohci-hub.c
index 65cac8c..4dd3902 100644
--- a/drivers/usb/host/ohci-hub.c
+++ b/drivers/usb/host/ohci-hub.c
@@ -284,7 +284,7 @@
spin_lock_irq (&ohci->lock);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
+ if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
rc = -ESHUTDOWN;
else
rc = ohci_rh_suspend (ohci, 0);
@@ -302,7 +302,7 @@
spin_lock_irq (&ohci->lock);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
+ if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
rc = -ESHUTDOWN;
else
rc = ohci_rh_resume (ohci);
@@ -489,7 +489,7 @@
unsigned long flags;
spin_lock_irqsave (&ohci->lock, flags);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
+ if (!HCD_HW_ACCESSIBLE(hcd))
goto done;
/* undocumented erratum seen on at least rev D */
@@ -533,8 +533,12 @@
}
}
- hcd->poll_rh = ohci_root_hub_state_changes(ohci, changed,
- any_connected, rhsc_status);
+ if (ohci_root_hub_state_changes(ohci, changed,
+ any_connected, rhsc_status))
+ set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+ else
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
+
done:
spin_unlock_irqrestore (&ohci->lock, flags);
@@ -701,7 +705,7 @@
u32 temp;
int retval = 0;
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)))
+ if (unlikely(!HCD_HW_ACCESSIBLE(hcd)))
return -ESHUTDOWN;
switch (typeReq) {
diff --git a/drivers/usb/host/oxu210hp-hcd.c b/drivers/usb/host/oxu210hp-hcd.c
index f608dfd..d9c85a2 100644
--- a/drivers/usb/host/oxu210hp-hcd.c
+++ b/drivers/usb/host/oxu210hp-hcd.c
@@ -1641,8 +1641,7 @@
#endif
spin_lock_irqsave(&oxu->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &oxu_to_hcd(oxu)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(oxu_to_hcd(oxu)))) {
rc = -ESHUTDOWN;
goto done;
}
@@ -2209,8 +2208,7 @@
spin_lock_irqsave(&oxu->lock, flags);
- if (unlikely(!test_bit(HCD_FLAG_HW_ACCESSIBLE,
- &oxu_to_hcd(oxu)->flags))) {
+ if (unlikely(!HCD_HW_ACCESSIBLE(oxu_to_hcd(oxu)))) {
status = -ESHUTDOWN;
goto done;
}
@@ -2715,7 +2713,6 @@
u32 temp, hcc_params;
hcd->uses_new_polling = 1;
- hcd->poll_rh = 0;
/* EHCI spec section 4.1 */
retval = ehci_reset(oxu);
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index d1dce21..2743ec7 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -140,7 +140,7 @@
uhci->rh_state = UHCI_RH_RESET;
uhci->is_stopped = UHCI_IS_STOPPED;
uhci_to_hcd(uhci)->state = HC_STATE_HALT;
- uhci_to_hcd(uhci)->poll_rh = 0;
+ clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
uhci->dead = 0; /* Full reset resurrects the controller */
}
@@ -344,7 +344,10 @@
/* If interrupts don't work and remote wakeup is enabled then
* the suspended root hub needs to be polled.
*/
- uhci_to_hcd(uhci)->poll_rh = (!int_enable && wakeup_enable);
+ if (!int_enable && wakeup_enable)
+ set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
+ else
+ clear_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
uhci_scan_schedule(uhci);
uhci_fsbr_off(uhci);
@@ -363,7 +366,7 @@
uhci->io_addr + USBINTR);
mb();
uhci->rh_state = UHCI_RH_RUNNING;
- uhci_to_hcd(uhci)->poll_rh = 1;
+ set_bit(HCD_FLAG_POLL_RH, &uhci_to_hcd(uhci)->flags);
}
static void wakeup_rh(struct uhci_hcd *uhci)
@@ -733,7 +736,7 @@
struct uhci_hcd *uhci = hcd_to_uhci(hcd);
spin_lock_irq(&uhci->lock);
- if (test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) && !uhci->dead)
+ if (HCD_HW_ACCESSIBLE(hcd) && !uhci->dead)
uhci_hc_died(uhci);
uhci_scan_schedule(uhci);
spin_unlock_irq(&uhci->lock);
@@ -750,7 +753,7 @@
int rc = 0;
spin_lock_irq(&uhci->lock);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
+ if (!HCD_HW_ACCESSIBLE(hcd))
rc = -ESHUTDOWN;
else if (uhci->dead)
; /* Dead controllers tell no tales */
@@ -777,7 +780,7 @@
int rc = 0;
spin_lock_irq(&uhci->lock);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
+ if (!HCD_HW_ACCESSIBLE(hcd))
rc = -ESHUTDOWN;
else if (!uhci->dead)
wakeup_rh(uhci);
@@ -793,7 +796,7 @@
dev_dbg(uhci_dev(uhci), "%s\n", __func__);
spin_lock_irq(&uhci->lock);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
+ if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
goto done_okay; /* Already suspended or dead */
if (uhci->rh_state > UHCI_RH_SUSPENDED) {
@@ -807,7 +810,7 @@
*/
pci_write_config_word(to_pci_dev(uhci_dev(uhci)), USBLEGSUP, 0);
mb();
- hcd->poll_rh = 0;
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
/* FIXME: Enable non-PME# remote wakeup? */
@@ -860,7 +863,7 @@
* the suspended root hub needs to be polled.
*/
if (!uhci->RD_enable && hcd->self.root_hub->do_remote_wakeup) {
- hcd->poll_rh = 1;
+ set_bit(HCD_FLAG_POLL_RH, &hcd->flags);
usb_hcd_poll_rh_status(hcd);
}
return 0;
diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c
index 8270055..f0c5811 100644
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -190,7 +190,7 @@
spin_lock_irqsave(&uhci->lock, flags);
uhci_scan_schedule(uhci);
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
+ if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
goto done;
uhci_check_ports(uhci);
@@ -246,7 +246,7 @@
u16 wPortChange, wPortStatus;
unsigned long flags;
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
+ if (!HCD_HW_ACCESSIBLE(hcd) || uhci->dead)
return -ETIMEDOUT;
spin_lock_irqsave(&uhci->lock, flags);
diff --git a/drivers/usb/host/whci/hcd.c b/drivers/usb/host/whci/hcd.c
index e0d3401..72b6892 100644
--- a/drivers/usb/host/whci/hcd.c
+++ b/drivers/usb/host/whci/hcd.c
@@ -68,7 +68,7 @@
whc_write_wusbcmd(whc, WUSBCMD_RUN, WUSBCMD_RUN);
usb_hcd->uses_new_polling = 1;
- usb_hcd->poll_rh = 1;
+ set_bit(HCD_FLAG_POLL_RH, &usb_hcd->flags);
usb_hcd->state = HC_STATE_RUNNING;
out:
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 343f104..5e73386 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -427,7 +427,6 @@
void (*doorbell)(struct xhci_hcd *) = NULL;
hcd->uses_new_polling = 1;
- hcd->poll_rh = 0;
xhci_dbg(xhci, "xhci_run\n");
#if 0 /* FIXME: MSI not setup yet */
@@ -733,7 +732,7 @@
ret = -EINVAL;
goto exit;
}
- if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
+ if (!HCD_HW_ACCESSIBLE(hcd)) {
if (!in_interrupt())
xhci_dbg(xhci, "urb submitted during PCI suspend\n");
ret = -ESHUTDOWN;