From 968b822c0023861ef6e4e15bb68582b36e89ad29 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Thu, 3 Nov 2011 12:03:38 -0400 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/c67x00/c67x00-hcd.c | 1 - drivers/usb/core/hcd-pci.c | 4 ---- drivers/usb/core/hcd.c | 24 +++--------------------- drivers/usb/host/hwa-hc.c | 1 - drivers/usb/host/xhci-ring.c | 12 +----------- drivers/usb/musb/musb_core.c | 1 - include/linux/usb/hcd.h | 2 -- 7 files changed, 4 insertions(+), 41 deletions(-) diff --git a/drivers/usb/c67x00/c67x00-hcd.c b/drivers/usb/c67x00/c67x00-hcd.c index d3e1356d091e..75e47b860a53 100644 --- a/drivers/usb/c67x00/c67x00-hcd.c +++ b/drivers/usb/c67x00/c67x00-hcd.c @@ -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); } } diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c index a004db35f6d0..d136b8f4c8a7 100644 --- a/drivers/usb/core/hcd-pci.c +++ b/drivers/usb/core/hcd-pci.c @@ -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); diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c index 13222d352a61..43a89e4ba928 100644 --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -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; diff --git a/drivers/usb/host/hwa-hc.c b/drivers/usb/host/hwa-hc.c index 9bfac657572e..565d79f06e6f 100644 --- a/drivers/usb/host/hwa-hc.c +++ b/drivers/usb/host/hwa-hc.c @@ -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); diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 940321b3ec68..2f8c17381c6c 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2389,17 +2389,7 @@ irqreturn_t xhci_irq(struct usb_hcd *hcd) 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 ****/ diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 20a28731c338..12044c473c38 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -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; diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h index 03354d557b79..b2f62f3a32af 100644 --- a/include/linux/usb/hcd.h +++ b/include/linux/usb/hcd.h @@ -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)) -- GitLab