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Date: Tue, 28 Apr 2020 20:25:29 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Mathias Nyman <mathias.nyman@...ux.intel.com> Subject: [PATCH 5.4 155/168] xhci: prevent bus suspend if a roothub port detected a over-current condition From: Mathias Nyman <mathias.nyman@...ux.intel.com> 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: <stable@...r.kernel.org> Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com> Link: https://lore.kernel.org/r/20200421140822.28233-3-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/usb/host/xhci-hub.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -1569,6 +1569,8 @@ int xhci_hub_status_data(struct usb_hcd } 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) {
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