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Commit 69fff59d authored by Alan Stern's avatar Alan Stern Committed by Greg Kroah-Hartman
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USB: remove remaining usages of hcd->state from usbcore and fix regression 



This patch (as1467) removes the last usages of hcd->state from
usbcore.  We no longer check to see if an interrupt handler finds that
a controller has died; instead we rely on host controller drivers to
make an explicit call to usb_hc_died().

This fixes a regression introduced by commit
9b37596a (USB: move usbcore away from
hcd->state).  It used to be that when a controller shared an IRQ with
another device and an interrupt arrived while hcd->state was set to
HC_STATE_HALT, the interrupt handler would be skipped.  The commit
removed that test; as a result the current code doesn't skip calling
the handler and ends up believing the controller has died, even though
it's only temporarily stopped.  The solution is to ignore HC_STATE_HALT
following the handler's return.

As a consequence of this change, several of the host controller
drivers need to be modified.  They can no longer implicitly rely on
usbcore realizing that a controller has died because of hcd->state.
The patch adds calls to usb_hc_died() in the appropriate places.

The patch also changes a few of the interrupt handlers.  They don't
expect to be called when hcd->state is equal to HC_STATE_HALT, even if
the controller is still alive.  Early returns were added to avoid any
confusion.

Signed-off-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Tested-by: default avatarManuel Lauss <manuel.lauss@googlemail.com>
CC: Rodolfo Giometti <giometti@linux.it>
CC: Olav Kongas <ok@artecdesign.ee>
CC: <stable@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d2389440

drivers/usb/core/hcd.c

+1 −4
Original line number Diff line number Diff line
@@ -986,7 +986,7 @@ static int register_root_hub(struct usb_hcd *hcd) 
		spin_unlock_irq (&hcd_root_hub_lock);



		/* Did the HC die before the root hub was registered? */

		if (HCD_DEAD(hcd) || hcd->state == HC_STATE_HALT)

		if (HCD_DEAD(hcd))

			usb_hc_died (hcd);	/* This time clean up */

	}
@@ -2128,9 +2128,6 @@ irqreturn_t usb_hcd_irq (int irq, void *__hcd) 
		set_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);

		if (hcd->shared_hcd)

			set_bit(HCD_FLAG_SAW_IRQ, &hcd->shared_hcd->flags);



		if (unlikely(hcd->state == HC_STATE_HALT))

			usb_hc_died(hcd);

		rc = IRQ_HANDLED;

	}

drivers/usb/host/ehci-hcd.c

+3 −1
Original line number Diff line number Diff line
@@ -777,8 +777,9 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) 
		goto dead;

	}



	/* Shared IRQ? */

	masked_status = status & INTR_MASK;

	if (!masked_status) {		/* irq sharing? */

	if (!masked_status || unlikely(hcd->state == HC_STATE_HALT)) {

		spin_unlock(&ehci->lock);

		return IRQ_NONE;

	}
@@ -873,6 +874,7 @@ static irqreturn_t ehci_irq (struct usb_hcd *hcd) 
dead:

		ehci_reset(ehci);

		ehci_writel(ehci, 0, &ehci->regs->configured_flag);

		usb_hc_died(hcd);

		/* generic layer kills/unlinks all urbs, then

		 * uses ehci_stop to clean up the rest

		 */

drivers/usb/host/ehci-sched.c

+6 −2
Original line number Diff line number Diff line
@@ -471,8 +471,10 @@ static int enable_periodic (struct ehci_hcd *ehci) 
	 */

	status = handshake_on_error_set_halt(ehci, &ehci->regs->status,

					     STS_PSS, 0, 9 * 125);

	if (status)

	if (status) {

		usb_hc_died(ehci_to_hcd(ehci));

		return status;

	}



	cmd = ehci_readl(ehci, &ehci->regs->command) | CMD_PSE;

	ehci_writel(ehci, cmd, &ehci->regs->command);
@@ -510,8 +512,10 @@ static int disable_periodic (struct ehci_hcd *ehci) 
	 */

	status = handshake_on_error_set_halt(ehci, &ehci->regs->status,

					     STS_PSS, STS_PSS, 9 * 125);

	if (status)

	if (status) {

		usb_hc_died(ehci_to_hcd(ehci));

		return status;

	}



	cmd = ehci_readl(ehci, &ehci->regs->command) & ~CMD_PSE;

	ehci_writel(ehci, cmd, &ehci->regs->command);

drivers/usb/host/isp116x-hcd.c

+1 −0
Original line number Diff line number Diff line
@@ -612,6 +612,7 @@ static irqreturn_t isp116x_irq(struct usb_hcd *hcd) 
			/* IRQ's are off, we do no DMA,

			   perfectly ready to die ... */

			hcd->state = HC_STATE_HALT;

			usb_hc_died(hcd);

			ret = IRQ_HANDLED;

			goto done;

		}

drivers/usb/host/ohci-hcd.c

+3 −1
Original line number Diff line number Diff line
@@ -764,6 +764,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd) 
	if (ints == ~(u32)0) {

		disable (ohci);

		ohci_dbg (ohci, "device removed!\n");

		usb_hc_died(hcd);

		return IRQ_HANDLED;

	}
@@ -771,7 +772,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd) 
	ints &= ohci_readl(ohci, &regs->intrenable);



	/* interrupt for some other device? */

	if (ints == 0)

	if (ints == 0 || unlikely(hcd->state == HC_STATE_HALT))

		return IRQ_NOTMINE;



	if (ints & OHCI_INTR_UE) {
@@ -788,6 +789,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd) 
		} else {

			disable (ohci);

			ohci_err (ohci, "OHCI Unrecoverable Error, disabled\n");

			usb_hc_died(hcd);

		}



		ohci_dump (ohci, 1);