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xhci: prevent bus suspend if a roothub port detected a over-current condition

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commit e9fb08d617bfae5471d902112667d0eeb9dee3c4 upstream.

Suspending the bus and host controller while a port is in a over-current
condition may halt the host.
Also keep the roothub running if over-current is active.

Cc: <[email protected]>
Signed-off-by: Mathias Nyman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Mathias Nyman 2020-04-21 17:08:21 +03:00 • committed by Greg Kroah-Hartman
commit 54470b0bd1
1 changed files with 9 additions and 0 deletions
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9
drivers/usb/host/xhci-hub.c
View file

@ -1569,6 +1569,8 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
}
if ((temp & PORT_RC))
reset_change = true;
if (temp & PORT_OC)
status = 1;
}
if (!status && !reset_change) {
xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
@ -1634,6 +1636,13 @@ retry:
port_index);
goto retry;
}
/* bail out if port detected a over-current condition */
if (t1 & PORT_OC) {
bus_state->bus_suspended = 0;
spin_unlock_irqrestore(&xhci->lock, flags);
xhci_dbg(xhci, "Bus suspend bailout, port over-current detected\n");
return -EBUSY;
}
/* suspend ports in U0, or bail out for new connect changes */
if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) {
if ((t1 & PORT_CSC) && wake_enabled) {