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Message-Id: <20200428182245.044598334@linuxfoundation.org>
Date: Tue, 28 Apr 2020 20:25:30 +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 5.6 154/167] 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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