usb: xhci: lock mutex on xhci_stop

Else it races with xhci_setup_device Signed-off-by: Roger Quadros <[email protected]> Signed-off-by: Sekhar Nori <[email protected]>
rogerq · Aug 27, 2015 · e546b06 · e546b06
1 parent 1d662b6
commit e546b06
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
@@ -677,8 +677,11 @@ void xhci_stop(struct usb_hcd *hcd)
 	u32 temp;
 	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 
+	mutex_lock(&xhci->mutex);
+
 	if (!usb_hcd_is_primary_hcd(hcd)) {
 		xhci_only_stop_hcd(xhci->shared_hcd);
+		mutex_unlock(&xhci->mutex);
 		return;
 	}
 
@@ -717,6 +720,7 @@ void xhci_stop(struct usb_hcd *hcd)
 	xhci_dbg_trace(xhci, trace_xhci_dbg_init,
 			"xhci_stop completed - status = %x",
 			readl(&xhci->op_regs->status));
+	mutex_unlock(&xhci->mutex);
 }
 
 /*