usb: musb: Fix locking errors for host only mode

If we have USB gadgets disabled and USB_MUSB_HOST set, we get
errors "possible irq lock inverssion dependency detected"
errors during boot.

Let's fix the issue by adding start_musb flag and start
the controller after we're out of the spinlock protected
section.

Reported-by: Ladislav Michl <ladis@linux-mips.org>
Tested-by: Ladislav Michl <ladis@linux-mips.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index 192248f..fe08e77 100644 (file)
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -290,6 +290,7 @@ int musb_hub_control(
        u32             temp;
        int             retval = 0;
        unsigned long   flags;
+       bool            start_musb = false;
 
        spin_lock_irqsave(&musb->lock, flags);
 
@@ -390,7 +391,7 @@ int musb_hub_control(
                         * logic relating to VBUS power-up.
                         */
                        if (!hcd->self.is_b_host && musb_has_gadget(musb))
-                               musb_start(musb);
+                               start_musb = true;
                        break;
                case USB_PORT_FEAT_RESET:
                        musb_port_reset(musb, true);
@@ -451,5 +452,9 @@ error:
                retval = -EPIPE;
        }
        spin_unlock_irqrestore(&musb->lock, flags);
+
+       if (start_musb)
+               musb_start(musb);
+
        return retval;
 }