usb: musb: avoid NULL pointer dereference

commit eee3f15d5f1f4f0c283dd4db67dc1b874a2852d1 upstream.

instead of relying on the otg pointer, which
can be NULL in certain cases, we can use the
gadget and host pointers we already hold inside
struct musb.

Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 37a261a..da0caf3 100644 (file)
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -440,7 +440,6 @@ void musb_hnp_stop(struct musb *musb)
 static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                                u8 devctl)
 {
-       struct usb_otg *otg = musb->xceiv->otg;
        irqreturn_t handled = IRQ_NONE;
 
        dev_dbg(musb->controller, "<== DevCtl=%02x, int_usb=0x%x\n", devctl,
@@ -655,7 +654,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                                break;
                case OTG_STATE_B_PERIPHERAL:
                        musb_g_suspend(musb);
-                       musb->is_active = otg->gadget->b_hnp_enable;
+                       musb->is_active = musb->g.b_hnp_enable;
                        if (musb->is_active) {
                                musb->xceiv->state = OTG_STATE_B_WAIT_ACON;
                                dev_dbg(musb->controller, "HNP: Setting timer for b_ase0_brst\n");
@@ -671,7 +670,7 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
                        break;
                case OTG_STATE_A_HOST:
                        musb->xceiv->state = OTG_STATE_A_SUSPEND;
-                       musb->is_active = otg->host->b_hnp_enable;
+                       musb->is_active = musb_to_hcd(musb)->self.b_hnp_enable;
                        break;
                case OTG_STATE_B_HOST:
                        /* Transition to B_PERIPHERAL, see 6.8.2.6 p 44 */