From 8b3ab0edaf6acd281243bf974fac7e01c9574d08 Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Fri, 18 Jul 2014 16:25:49 -0400 Subject: [PATCH] USB: OHCI: no shortcut for unlinking URBS from a dead controller When an URB is unlinked from a dead controller, ohci-hcd gives back the URB with no regard for cleaning up the internal data structures. This won't play nicely with the upcoming changes to the TD done list. Therefore make ohci_urb_dequeue() call finish_unlinks(), which uses td_done() to do a proper cleanup, rather than calling finish_urb() directly. Also, remove the checks that urb_priv is non-NULL; the driver guarantees that urb_priv will never be NULL for a valid URB. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/ohci-hcd.c | 22 ++++++++-------------- 1 file changed, 8 insertions(+), 14 deletions(-) diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c index a8f0e1b00e7d..52829276a44e 100644 --- a/drivers/usb/host/ohci-hcd.c +++ b/drivers/usb/host/ohci-hcd.c @@ -300,30 +300,24 @@ static int ohci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) struct ohci_hcd *ohci = hcd_to_ohci (hcd); unsigned long flags; int rc; + urb_priv_t *urb_priv; spin_lock_irqsave (&ohci->lock, flags); rc = usb_hcd_check_unlink_urb(hcd, urb, status); - if (rc) { - ; /* Do nothing */ - } else if (ohci->rh_state == OHCI_RH_RUNNING) { - urb_priv_t *urb_priv; + if (rc == 0) { /* Unless an IRQ completed the unlink while it was being * handed to us, flag it for unlink and giveback, and force * some upcoming INTR_SF to call finish_unlinks() */ urb_priv = urb->hcpriv; - if (urb_priv) { - if (urb_priv->ed->state == ED_OPER) - start_ed_unlink (ohci, urb_priv->ed); + if (urb_priv->ed->state == ED_OPER) + start_ed_unlink(ohci, urb_priv->ed); + + if (ohci->rh_state != OHCI_RH_RUNNING) { + /* With HC dead, we can clean up right away */ + finish_unlinks(ohci, 0); } - } else { - /* - * with HC dead, we won't respect hc queue pointers - * any more ... just clean up every urb's memory. - */ - if (urb->hcpriv) - finish_urb(ohci, urb, status); } spin_unlock_irqrestore (&ohci->lock, flags); return rc; -- 2.34.1