From: Alan Stern <[EMAIL PROTECTED]>
This patch (as676) fixes a small bug in uhci-hcd's enqueue routine. When
an URB is unlinked or gets an error and the completion handler queues
another URB for the same endpoint, the queue shouldn't be allowed to start
up again until the handler returns. Not even if the new URB is the only
one on its queue.
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
drivers/usb/host/uhci-q.c | 24 +++++++++++++++---------
1 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 8639e90..693e92c 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -1148,8 +1148,9 @@ static int uhci_urb_enqueue(struct usb_h
/* If the new URB is the first and only one on this QH then either
* the QH is new and idle or else it's unlinked and waiting to
- * become idle, so we can activate it right away. */
- if (qh->queue.next == &urbp->node)
+ * become idle, so we can activate it right away. But only if the
+ * queue isn't stopped. */
+ if (qh->queue.next == &urbp->node && !qh->is_stopped)
uhci_activate_qh(uhci, qh);
goto done;
@@ -1293,27 +1294,32 @@ static void uhci_scan_qh(struct uhci_hcd
if (urb->status == -EINPROGRESS) /* Not dequeued */
urb->status = status;
else
- status = -ECONNRESET;
+ status = ECONNRESET; /* Not -ECONNRESET */
spin_unlock(&urb->lock);
/* Dequeued but completed URBs can't be given back unless
* the QH is stopped or has finished unlinking. */
- if (status == -ECONNRESET &&
- !(qh->is_stopped || QH_FINISHED_UNLINKING(qh)))
- return;
+ if (status == ECONNRESET) {
+ if (QH_FINISHED_UNLINKING(qh))
+ qh->is_stopped = 1;
+ else if (!qh->is_stopped)
+ return;
+ }
uhci_giveback_urb(uhci, qh, urb, regs);
- if (qh->is_stopped)
+ if (status < 0)
break;
}
/* If the QH is neither stopped nor finished unlinking (normal case),
* our work here is done. */
- restart:
- if (!(qh->is_stopped || QH_FINISHED_UNLINKING(qh)))
+ if (QH_FINISHED_UNLINKING(qh))
+ qh->is_stopped = 1;
+ else if (!qh->is_stopped)
return;
/* Otherwise give back each of the dequeued URBs */
+restart:
list_for_each_entry(urbp, &qh->queue, node) {
urb = urbp->urb;
if (urb->status != -EINPROGRESS) {
--
1.4.0
All the advantages of Linux Managed Hosting--Without the Cost and Risk!
Fully trained technicians. The highest number of Red Hat certifications in
the hosting industry. Fanatical Support. Click to learn more
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=107521&bid=248729&dat=121642
_______________________________________________
linux-usb-devel@lists.sourceforge.net
To unsubscribe, use the last form field at:
https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
