UHCI: Add some WARN_ON()s
This patch (as872) adds some WARN_ON()s to various error checks which
are never supposed to fail. Unsettlingly, one of them has shown up in
a user's log! Maybe making the warning more visible and having the
call-stack information available will help pinpoint the source of the
problem.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index 19a0cc0..4aed305 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -123,10 +123,14 @@
static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td)
{
- if (!list_empty(&td->list))
+ if (!list_empty(&td->list)) {
dev_warn(uhci_dev(uhci), "td %p still in list!\n", td);
- if (!list_empty(&td->fl_list))
+ WARN_ON(1);
+ }
+ if (!list_empty(&td->fl_list)) {
dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td);
+ WARN_ON(1);
+ }
dma_pool_free(uhci->td_pool, td, td->dma_handle);
}
@@ -291,8 +295,10 @@
static void uhci_free_qh(struct uhci_hcd *uhci, struct uhci_qh *qh)
{
WARN_ON(qh->state != QH_STATE_IDLE && qh->udev);
- if (!list_empty(&qh->queue))
+ if (!list_empty(&qh->queue)) {
dev_warn(uhci_dev(uhci), "qh %p list not empty!\n", qh);
+ WARN_ON(1);
+ }
list_del(&qh->node);
if (qh->udev) {
@@ -740,9 +746,11 @@
{
struct uhci_td *td, *tmp;
- if (!list_empty(&urbp->node))
+ if (!list_empty(&urbp->node)) {
dev_warn(uhci_dev(uhci), "urb %p still on QH's list!\n",
urbp->urb);
+ WARN_ON(1);
+ }
list_for_each_entry_safe(td, tmp, &urbp->td_list, list) {
uhci_remove_td_from_urbp(td);