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xhci: Better debugging for critical host errors.

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When a host controller gives a bad event TRB, we should print out the
contents of the TRB as a warning so that users don't have to recompile
their kernel to get information about what went wrong.  Also, print out
the event ring if they have xHCI debugging turned on, since previous
events can often explain what happened before the bad TRB occurred.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
This commit is contained in:
Sarah Sharp 2011-12-01 14:50:30 -08:00 • committed by Greg Kroah-Hartman
commit 9258c0b26b
1 changed files with 18 additions and 0 deletions
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18
drivers/usb/host/xhci-ring.c
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@ -1933,6 +1933,15 @@ static int handle_tx_event(struct xhci_hcd *xhci,
xdev = xhci->devs[slot_id];
if (!xdev) {
xhci_err(xhci, "ERROR Transfer event pointed to bad slot\n");
xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n",
xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
xhci->event_ring->dequeue),
lower_32_bits(le64_to_cpu(event->buffer)),
upper_32_bits(le64_to_cpu(event->buffer)),
le32_to_cpu(event->transfer_len),
le32_to_cpu(event->flags));
xhci_dbg(xhci, "Event ring:\n");
xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
return -ENODEV;
}
@ -1946,6 +1955,15 @@ static int handle_tx_event(struct xhci_hcd *xhci,
EP_STATE_DISABLED) {
xhci_err(xhci, "ERROR Transfer event for disabled endpoint "
"or incorrect stream ring\n");
xhci_err(xhci, "@%016llx %08x %08x %08x %08x\n",
xhci_trb_virt_to_dma(xhci->event_ring->deq_seg,
xhci->event_ring->dequeue),
lower_32_bits(le64_to_cpu(event->buffer)),
upper_32_bits(le64_to_cpu(event->buffer)),
le32_to_cpu(event->transfer_len),
le32_to_cpu(event->flags));
xhci_dbg(xhci, "Event ring:\n");
xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
return -ENODEV;
}