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authorAlan Stern <stern@rowland.harvard.edu>2013-03-22 13:31:11 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-25 13:35:05 -0700
commit7bc782d73c7db042ecc965866b8c1c2b7d6e93d6 (patch)
treefa5fcfb05da245b4b611585b36a9271c8144fd6b /drivers/usb/host/ehci-sched.c
parent79bcf7b02ba3d45bafe81a2753cedb8ef49548e3 (diff)
downloadlinux-stericsson-7bc782d73c7db042ecc965866b8c1c2b7d6e93d6.tar.gz
USB: EHCI: split needs_rescan into two flags
This patch (as1662) does some more QH-related cleanup in ehci-hcd. The qh->needs_rescan flag is currently used for two different purposes; the patch replaces it with two separate flags for greater clarity: qh->dequeue_during_giveback indicates that a completion handler dequeued an URB (implying that a rescan is needed), and qh->exception indicates that the QH is in an exceptional state requiring an unlink (either it encountered an I/O error or an unlink was requested). The new flags get set where the dequeue, exception, or unlink request occurred, rather than where the unlink is started. This is so that in the future, if we need to, we will be able to tell apart unlinks that truly were required from those that were carried out merely because the QH wasn't being used. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/host/ehci-sched.c')
-rw-r--r--drivers/usb/host/ehci-sched.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 5c82bbab9a48..e7a2dbd27b1e 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -539,6 +539,7 @@ static void qh_link_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
}
qh->qh_state = QH_STATE_LINKED;
qh->xacterrs = 0;
+ qh->exception = 0;
/* update per-qh bandwidth for usbfs */
ehci_to_hcd(ehci)->self.bandwidth_allocated += qh->period
@@ -602,15 +603,9 @@ static void qh_unlink_periodic(struct ehci_hcd *ehci, struct ehci_qh *qh)
static void start_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh)
{
- /* If the QH isn't linked then there's nothing we can do
- * unless we were called during a giveback, in which case
- * qh_completions() has to deal with it.
- */
- if (qh->qh_state != QH_STATE_LINKED) {
- if (qh->qh_state == QH_STATE_COMPLETING)
- qh->needs_rescan = 1;
+ /* If the QH isn't linked then there's nothing we can do. */
+ if (qh->qh_state != QH_STATE_LINKED)
return;
- }
qh_unlink_periodic (ehci, qh);