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path: root/drivers/usb/host/xhci-ring.c
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Diffstat (limited to 'drivers/usb/host/xhci-ring.c')
-rw-r--r--drivers/usb/host/xhci-ring.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index b69a0a136e66..b0b4cc3b8584 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -1235,6 +1235,7 @@ static void handle_port_status(struct xhci_hcd *xhci,
u8 major_revision;
struct xhci_bus_state *bus_state;
u32 __iomem **port_array;
+ bool bogus_port_status = false;
/* Port status change events always have a successful completion code */
if (GET_COMP_CODE(event->generic.field[2]) != COMP_SUCCESS) {
@@ -1247,6 +1248,7 @@ static void handle_port_status(struct xhci_hcd *xhci,
max_ports = HCS_MAX_PORTS(xhci->hcs_params1);
if ((port_id <= 0) || (port_id > max_ports)) {
xhci_warn(xhci, "Invalid port id %d\n", port_id);
+ bogus_port_status = true;
goto cleanup;
}
@@ -1258,12 +1260,14 @@ static void handle_port_status(struct xhci_hcd *xhci,
xhci_warn(xhci, "Event for port %u not in "
"Extended Capabilities, ignoring.\n",
port_id);
+ bogus_port_status = true;
goto cleanup;
}
if (major_revision == DUPLICATE_ENTRY) {
xhci_warn(xhci, "Event for port %u duplicated in"
"Extended Capabilities, ignoring.\n",
port_id);
+ bogus_port_status = true;
goto cleanup;
}
@@ -1335,6 +1339,13 @@ cleanup:
/* Update event ring dequeue pointer before dropping the lock */
inc_deq(xhci, xhci->event_ring, true);
+ /* Don't make the USB core poll the roothub if we got a bad port status
+ * change event. Besides, at that point we can't tell which roothub
+ * (USB 2.0 or USB 3.0) to kick.
+ */
+ if (bogus_port_status)
+ return;
+
spin_unlock(&xhci->lock);
/* Pass this up to the core */
usb_hcd_poll_rh_status(hcd);