Commit ae52c0d8 authored by Aaron Ma's avatar Aaron Ma Committed by Greg Kroah-Hartman
Browse files

usb: xhci: fix uninitialized completion when USB3 port got wrong status

commit 958c0bd86075d4ef1c936998deefe1947e539240 upstream.

Realtek USB3.0 Card Reader [0bda:0328] reports wrong port status on
Cannon lake PCH USB3.1 xHCI [8086:a36d] after resume from S3,
after clear port reset it works fine.

Since this device is registered on USB3 roothub at boot,
when port status reports not superspeed, xhci_get_port_status will call
an uninitialized completion in bus_state[0].
Kernel will hang because of NULL pointer.

Restrict the USB2 resume status check in USB2 roothub to fix hang issue.

Signed-off-by: default avatarAaron Ma <>
Signed-off-by: default avatarMathias Nyman <>
Signed-off-by: default avatarGreg Kroah-Hartman <>
parent 2b7e9180
...@@ -744,7 +744,7 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd, ...@@ -744,7 +744,7 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
} }
if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME && if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME &&
!DEV_SUPERSPEED_ANY(raw_port_status)) { !DEV_SUPERSPEED_ANY(raw_port_status) && hcd->speed < HCD_USB3) {
if ((raw_port_status & PORT_RESET) || if ((raw_port_status & PORT_RESET) ||
!(raw_port_status & PORT_PE)) !(raw_port_status & PORT_PE))
return 0xffffffff; return 0xffffffff;
...@@ -1673,7 +1673,7 @@ static void handle_port_status(struct xhci_hcd *xhci, ...@@ -1673,7 +1673,7 @@ static void handle_port_status(struct xhci_hcd *xhci,
* RExit to a disconnect state). If so, let the the driver know it's * RExit to a disconnect state). If so, let the the driver know it's
* out of the RExit state. * out of the RExit state.
*/ */
if (!DEV_SUPERSPEED_ANY(temp) && if (!DEV_SUPERSPEED_ANY(temp) && hcd->speed < HCD_USB3 &&
test_and_clear_bit(faked_port_index, test_and_clear_bit(faked_port_index,
&bus_state->rexit_ports)) { &bus_state->rexit_ports)) {
complete(&bus_state->rexit_done[faked_port_index]); complete(&bus_state->rexit_done[faked_port_index]);
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