[SRU][I/raspi][PATCH 2/2] xhci: guard accesses to ep_state in xhci_endpoint_reset()

[Juerg Haefliger]

From: Jonathan Bell <jonathan at raspberrypi.com>

BugLink: https://bugs.launchpad.net/bugs/1930629

See https://github.com/raspberrypi/linux/issues/3981

Two read-modify-write cycles on ep->ep_state are not guarded by
xhci->lock. Fix these.

Signed-off-by: Jonathan Bell <jonathan at raspberrypi.com>

(cherry picked from commit 30cafea2f07dd5d1f550631ee9e60160076ec4fd rpi-5.13.y)
Signed-off-by: Juerg Haefliger <juergh at canonical.com>
---
 drivers/usb/host/xhci.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index c006fa6f3578..1fdcff4e257e 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -3309,10 +3309,13 @@ static void xhci_endpoint_reset(struct usb_hcd *hcd,
 		return;
 
 	/* Bail out if toggle is already being cleared by a endpoint reset */
+	spin_lock_irqsave(&xhci->lock, flags);
 	if (ep->ep_state & EP_HARD_CLEAR_TOGGLE) {
 		ep->ep_state &= ~EP_HARD_CLEAR_TOGGLE;
+		spin_unlock_irqrestore(&xhci->lock, flags);
 		return;
 	}
+	spin_unlock_irqrestore(&xhci->lock, flags);
 	/* Only interrupt and bulk ep's use data toggle, USB2 spec 5.5.4-> */
 	if (usb_endpoint_xfer_control(&host_ep->desc) ||
 	    usb_endpoint_xfer_isoc(&host_ep->desc))
@@ -3398,8 +3401,10 @@ static void xhci_endpoint_reset(struct usb_hcd *hcd,
 	xhci_free_command(xhci, cfg_cmd);
 cleanup:
 	xhci_free_command(xhci, stop_cmd);
+	spin_lock_irqsave(&xhci->lock, flags);
 	if (ep->ep_state & EP_SOFT_CLEAR_TOGGLE)
 		ep->ep_state &= ~EP_SOFT_CLEAR_TOGGLE;
+	spin_unlock_irqrestore(&xhci->lock, flags);
 }
 
 static int xhci_check_streams_endpoint(struct xhci_hcd *xhci,
-- 
2.30.2