提交 d03d9633 编写于 作者: M Mathias Nyman 提交者: Greg Kroah-Hartman

xhci: make sure interrupts are restored to correct state

[ Upstream commit bd82873f23c9a6ad834348f8b83f3b6a5bca2c65 ]

spin_unlock_irqrestore() might be called with stale flags after
reading port status, possibly restoring interrupts to a incorrect
state.

If a usb2 port just finished resuming while the port status is read
the spin lock will be temporary released and re-acquired in a separate
function. The flags parameter is passed as value instead of a pointer,
not updating flags properly before the final spin_unlock_irqrestore()
is called.

Cc: <stable@vger.kernel.org> # v3.12+
Fixes: 8b3d4570 ("usb: Fix xHCI host issues on remote wakeup.")
Signed-off-by: NMathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20191211142007.8847-7-mathias.nyman@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NSasha Levin <sashal@kernel.org>
上级 64a8c501
......@@ -831,7 +831,7 @@ static u32 xhci_get_ext_port_status(u32 raw_port_status, u32 port_li)
static u32 xhci_get_port_status(struct usb_hcd *hcd,
struct xhci_bus_state *bus_state,
u16 wIndex, u32 raw_port_status,
unsigned long flags)
unsigned long *flags)
__releases(&xhci->lock)
__acquires(&xhci->lock)
{
......@@ -917,12 +917,12 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
xhci_test_and_clear_bit(xhci, port, PORT_PLC);
xhci_set_link_state(xhci, port, XDEV_U0);
spin_unlock_irqrestore(&xhci->lock, flags);
spin_unlock_irqrestore(&xhci->lock, *flags);
time_left = wait_for_completion_timeout(
&bus_state->rexit_done[wIndex],
msecs_to_jiffies(
XHCI_MAX_REXIT_TIMEOUT_MS));
spin_lock_irqsave(&xhci->lock, flags);
spin_lock_irqsave(&xhci->lock, *flags);
if (time_left) {
slot_id = xhci_find_slot_id_by_port(hcd,
......@@ -1076,7 +1076,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
}
trace_xhci_get_port_status(wIndex, temp);
status = xhci_get_port_status(hcd, bus_state, wIndex, temp,
flags);
&flags);
if (status == 0xffffffff)
goto error;
......
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