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authorAlan Stern <stern@rowland.harvard.edu>2013-03-22 13:30:56 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-03-25 13:35:05 -0700
commit79bcf7b02ba3d45bafe81a2753cedb8ef49548e3 (patch)
treeda06b30b0fdd12dfb3286bed6a940bd2e4e0dfe0 /drivers/usb/host/ehci-sched.c
parentc1fdb68e3d73741630ca16695cf9176c233be7ed (diff)
downloadlinux-stericsson-79bcf7b02ba3d45bafe81a2753cedb8ef49548e3.tar.gz
USB: EHCI: change return value of qh_completions()
This patch (as1658) cleans up the usage of qh_completions() in ehci-hcd. Currently the function's return value indicates whether any URBs were given back; the idea was that the caller can scan the QH over again to handle any URBs that were dequeued by a completion handler. This is not necessary; when qh_completions() is ready to give back dequeued URBs, it does its own rescanning. Therefore the new return value will be a flag indicating whether the caller needs to unlink the QH. This is more convenient than forcing the caller to check qh->needs_rescan, and it makes a lot more sense -- why should "needs_rescan" imply that an unlink is needed? The callers are also changed to remove the unneeded rescans. Lastly, the check for whether qh->qtd_list is non-empty is removed from the start of qh_completions(). Two of the callers have to make this test anyway, so the same test can simply be added to the other two callers. 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.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/usb/host/ehci-sched.c b/drivers/usb/host/ehci-sched.c
index 66259dc7822e..5c82bbab9a48 100644
--- a/drivers/usb/host/ehci-sched.c
+++ b/drivers/usb/host/ehci-sched.c
@@ -649,7 +649,8 @@ static void end_unlink_intr(struct ehci_hcd *ehci, struct ehci_qh *qh)
qh->qh_state = QH_STATE_IDLE;
hw->hw_next = EHCI_LIST_END(ehci);
- qh_completions(ehci, qh);
+ if (!list_empty(&qh->qtd_list))
+ qh_completions(ehci, qh);
/* reschedule QH iff another request is queued */
if (!list_empty(&qh->qtd_list) && ehci->rh_state == EHCI_RH_RUNNING) {
@@ -914,7 +915,7 @@ static void scan_intr(struct ehci_hcd *ehci)
list_for_each_entry_safe(qh, ehci->qh_scan_next, &ehci->intr_qh_list,
intr_node) {
- rescan:
+
/* clean any finished work for this qh */
if (!list_empty(&qh->qtd_list)) {
int temp;
@@ -927,12 +928,9 @@ static void scan_intr(struct ehci_hcd *ehci)
* in qh_unlink_periodic().
*/
temp = qh_completions(ehci, qh);
- if (unlikely(qh->needs_rescan ||
- (list_empty(&qh->qtd_list) &&
- qh->qh_state == QH_STATE_LINKED)))
+ if (unlikely(temp || (list_empty(&qh->qtd_list) &&
+ qh->qh_state == QH_STATE_LINKED)))
start_unlink_intr(ehci, qh);
- else if (temp != 0)
- goto rescan;
}
}
}