USB: musb: check if set_irq_wake succeded and remember it

Without it, in platforms that don't provide irq_chip.set_wake(),
like omap, musb will WARN() on driver removal.

Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 7 insertions, 2 deletions

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 8b14437331c7..83720f61fdba 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -1840,7 +1840,7 @@ static void musb_free(struct musb *musb)
         musb_gadget_cleanup(musb);
 #endif
 
-        if (musb->nIrq >= 0) {
+        if (musb->nIrq >= 0 && musb->irq_wake) {
                 disable_irq_wake(musb->nIrq);
                 free_irq(musb->nIrq, musb);
         }
@@ -1993,8 +1993,12 @@ bad_config:
         }
         musb->nIrq = nIrq;
 /* FIXME this handles wakeup irqs wrong */
-        if (enable_irq_wake(nIrq) == 0)
+        if (enable_irq_wake(nIrq) == 0) {
+                musb->irq_wake = 1;
                 device_init_wakeup(dev, 1);
+        } else {
+                musb->irq_wake = 0;
+        }
 
         pr_info("%s: USB %s mode controller at %p using %s, IRQ %d\n",
                         musb_driver_name,
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index b3d605073071..d45d258e63f0 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -359,6 +359,7 @@ struct musb {
         struct otg_transceiver  xceiv;
 
         int nIrq;
+        unsigned                irq_wake:1;
 
         struct musb_hw_ep        endpoints[MUSB_C_NUM_EPS];
 #define control_ep              endpoints