speedtouch: wait for receive urb completion handlers to finish after calling
usb_unlink_urb.
speedtouch.c | 30 ++++++++++++++++++++++++++++++
1 files changed, 30 insertions(+)
diff -Nru a/drivers/usb/misc/speedtouch.c b/drivers/usb/misc/speedtouch.c
--- a/drivers/usb/misc/speedtouch.c Fri Jan 24 15:11:45 2003
+++ b/drivers/usb/misc/speedtouch.c Fri Jan 24 15:11:45 2003
@@ -906,6 +906,9 @@
static void udsl_usb_disconnect (struct usb_interface *intf)
{
struct udsl_instance_data *instance = usb_get_intfdata (intf);
+ struct list_head *pos;
+ unsigned long flags;
+ unsigned int count = 0;
int i;
PDEBUG ("disconnecting\n");
@@ -921,12 +924,39 @@
down (&instance->serialize);
/* no need to take the spinlock - recvqueue_tasklet is not running */
+ list_for_each (pos, &instance->spare_receivers)
+ if (++count > UDSL_NUMBER_RCV_URBS)
+ panic (__FILE__ ": memory corruption detected at line %d!\n",
+__LINE__);
INIT_LIST_HEAD (&instance->spare_receivers);
up (&instance->serialize);
+ PDEBUG ("udsl_usb_disconnect: flushed %u spare receivers\n", count);
+
+ count = UDSL_NUMBER_RCV_URBS - count;
+
for (i = 0; i < UDSL_NUMBER_RCV_URBS; i++)
usb_unlink_urb (instance->rcvbufs[i].urb);
+ /* wait for completion handlers to finish */
+ do {
+ unsigned int completed = 0;
+
+ spin_lock_irqsave (&instance->completed_receivers_lock, flags);
+ list_for_each (pos, &instance->completed_receivers)
+ if (++completed > count)
+ panic (__FILE__ ": memory corruption detected at line
+%d!\n", __LINE__);
+ spin_unlock_irqrestore (&instance->completed_receivers_lock, flags);
+
+ PDEBUG ("udsl_usb_disconnect: found %u completed receivers\n",
+completed);
+
+ if (completed == count)
+ break;
+
+ /* not all urbs accounted for */
+ yield ();
+ } while (1);
+
+ PDEBUG ("udsl_usb_disconnect: flushing %u completed receivers\n", count);
/* no need to take the spinlock - no completion handlers running */
INIT_LIST_HEAD (&instance->completed_receivers);
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