If we get an interrupt while we don't have an allocated event_ring, that
means we're enabling IRQs far too early. Instead of just printing an
error message, let's make sure to add a scary-looking Stack Trace so
people report these things and we fix them.
Eventually, when we're happy that this doesn't happen, we should just
remove this altogether.
Signed-off-by: Felipe Balbi <felipe.ba...@linux.intel.com>
---
drivers/usb/host/xhci-ring.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 772e07e2ef16..0fd990603f77 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2526,14 +2526,16 @@ static int handle_tx_event(struct xhci_hcd *xhci,
static int xhci_handle_event(struct xhci_hcd *xhci)
{
union xhci_trb *event;
+ struct device *dev;
int update_ptrs = 1;
int ret;
+ dev = xhci_to_hcd(xhci)->self.controller;
+
/* Event ring hasn't been allocated yet. */
- if (!xhci->event_ring || !xhci->event_ring->dequeue) {
- xhci_err(xhci, "ERROR event ring not ready\n");
+ if (dev_WARN_ONCE(dev, !xhci->event_ring || !xhci->event_ring->dequeue,
+ "event ring not ready\n"))
return -ENOMEM;
- }
event = xhci->event_ring->dequeue;
/* Does the HC or OS own the TRB? */
--
2.10.1
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