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USB: Remove the SAW_IRQ hcd flag 

The HCD_FLAG_SAW_IRQ flag was introduced in order to catch IRQ routing
errors: If an URB was unlinked and the host controller hadn't gotten
any IRQs, it seemed likely that the IRQs were directed to the wrong
vector.

This warning hasn't come up in many years, as far as I know; interrupt
routing now seems to be well under control.  Therefore there's no
reason to keep the flag around any more.  This patch (as1495) finally
removes it.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2011-11-03 12:03:38 -04:00 committed by Greg Kroah-Hartman
parent 2c1ce2b3fa
commit 968b822c00
7 changed files with 4 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/usb/c67x00/c67x00-hcd.c
View File

@ -271,7 +271,6 @@ static void c67x00_hcd_irq(struct c67x00_sie *sie, u16 int_status, u16 msg)
if (int_status & SOFEOP_FLG(sie->sie_num)) {
c67x00_ll_usb_clear_status(sie, SOF_EOP_IRQ_FLG);
c67x00_sched_kick(c67x00);
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
}
}

4
drivers/usb/core/hcd-pci.c
View File

@ -453,10 +453,6 @@ static int resume_common(struct device *dev, int event)
pci_set_master(pci_dev);
clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
if (hcd->shared_hcd)
clear_bit(HCD_FLAG_SAW_IRQ, &hcd->shared_hcd->flags);
if (hcd->driver->pci_resume && !HCD_DEAD(hcd)) {
if (event != PM_EVENT_AUTO_RESUME)
wait_for_companions(pci_dev, hcd);

24
drivers/usb/core/hcd.c
View File

@ -1168,20 +1168,6 @@ int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
if (urb->unlinked)
return -EBUSY;
urb->unlinked = status;
/* IRQ setup can easily be broken so that USB controllers
* never get completion IRQs ... maybe even the ones we need to
* finish unlinking the initial failed usb_set_address()
* or device descriptor fetch.
*/
if (!HCD_SAW_IRQ(hcd) && !is_root_hub(urb->dev)) {
dev_warn(hcd->self.controller, "Unlink after no-IRQ? "
"Controller is probably using the wrong IRQ.\n");
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
if (hcd->shared_hcd)
set_bit(HCD_FLAG_SAW_IRQ, &hcd->shared_hcd->flags);
}
return 0;
}
EXPORT_SYMBOL_GPL(usb_hcd_check_unlink_urb);
@ -2148,16 +2134,12 @@ irqreturn_t usb_hcd_irq (int irq, void *__hcd)
*/
local_irq_save(flags);
if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd))) {
if (unlikely(HCD_DEAD(hcd) || !HCD_HW_ACCESSIBLE(hcd)))
rc = IRQ_NONE;
} else if (hcd->driver->irq(hcd) == IRQ_NONE) {
else if (hcd->driver->irq(hcd) == IRQ_NONE)
rc = IRQ_NONE;
} else {
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
if (hcd->shared_hcd)
set_bit(HCD_FLAG_SAW_IRQ, &hcd->shared_hcd->flags);
else
rc = IRQ_HANDLED;
}
local_irq_restore(flags);
return rc;

1
drivers/usb/host/hwa-hc.c
View File

@ -776,7 +776,6 @@ static int hwahc_probe(struct usb_interface *usb_iface,
goto error_alloc;
}
usb_hcd->wireless = 1;
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);

12
drivers/usb/host/xhci-ring.c
View File

@ -2389,17 +2389,7 @@ hw_died:
irqreturn_t xhci_msi_irq(int irq, struct usb_hcd *hcd)
{
irqreturn_t ret;
struct xhci_hcd *xhci;
xhci = hcd_to_xhci(hcd);
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
if (xhci->shared_hcd)
set_bit(HCD_FLAG_SAW_IRQ, &xhci->shared_hcd->flags);
ret = xhci_irq(hcd);
return ret;
return xhci_irq(hcd);
}
/**** Endpoint Ring Operations ****/

1
drivers/usb/musb/musb_core.c
View File

@ -661,7 +661,6 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
handled = IRQ_HANDLED;
musb->is_active = 1;
set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);
musb->ep0_stage = MUSB_EP0_START;

2
include/linux/usb/hcd.h
View File

@ -99,7 +99,6 @@ struct usb_hcd {
*/
unsigned long flags;
#define HCD_FLAG_HW_ACCESSIBLE 0 /* at full power */
#define HCD_FLAG_SAW_IRQ 1
#define HCD_FLAG_POLL_RH 2 /* poll for rh status? */
#define HCD_FLAG_POLL_PENDING 3 /* status has changed? */
#define HCD_FLAG_WAKEUP_PENDING 4 /* root hub is resuming? */
@ -110,7 +109,6 @@ struct usb_hcd {
* be slightly faster than test_bit().
*/
#define HCD_HW_ACCESSIBLE(hcd) ((hcd)->flags & (1U << HCD_FLAG_HW_ACCESSIBLE))
#define HCD_SAW_IRQ(hcd) ((hcd)->flags & (1U << HCD_FLAG_SAW_IRQ))
#define HCD_POLL_RH(hcd) ((hcd)->flags & (1U << HCD_FLAG_POLL_RH))
#define HCD_POLL_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_POLL_PENDING))
#define HCD_WAKEUP_PENDING(hcd) ((hcd)->flags & (1U << HCD_FLAG_WAKEUP_PENDING))