usb: musb: Use delayed for musb_gadget_pullup

We have MUSB setting pm_runtime_irq_safe with the following
commits:

30a70b026b4c ("usb: musb: fix obex in g_nokia.ko causing kernel panic")
3e43a0725637 ("usb: musb: core: add pm_runtime_irq_safe()")

Let's fix things to use delayed work so we can remove the
pm_runtime_irq_safe.

Note that we may want to set this up in a generic way in the
gadget framework eventually.

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_core.h b/drivers/usb/musb/musb_core.h
index b6afe9e..2947384 100644 (file)
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -312,6 +312,7 @@ struct musb {
        struct work_struct      irq_work;
        struct delayed_work     deassert_reset_work;
        struct delayed_work     finish_resume_work;
+       struct delayed_work     gadget_work;
        u16                     hwvers;
 
        u16                     intrrxe;

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index 7ecc893..af2a3a7 100644 (file)
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -1656,6 +1656,20 @@ static int musb_gadget_vbus_draw(struct usb_gadget *gadget, unsigned mA)
        return usb_phy_set_power(musb->xceiv, mA);
 }
 
+static void musb_gadget_work(struct work_struct *work)
+{
+       struct musb *musb;
+       unsigned long flags;
+
+       musb = container_of(work, struct musb, gadget_work.work);
+       pm_runtime_get_sync(musb->controller);
+       spin_lock_irqsave(&musb->lock, flags);
+       musb_pullup(musb, musb->softconnect);
+       spin_unlock_irqrestore(&musb->lock, flags);
+       pm_runtime_mark_last_busy(musb->controller);
+       pm_runtime_put_autosuspend(musb->controller);
+}
+
 static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
 {
        struct musb     *musb = gadget_to_musb(gadget);
@@ -1663,20 +1677,16 @@ static int musb_gadget_pullup(struct usb_gadget *gadget, int is_on)
 
        is_on = !!is_on;
 
-       pm_runtime_get_sync(musb->controller);
-
        /* NOTE: this assumes we are sensing vbus; we'd rather
         * not pullup unless the B-session is active.
         */
        spin_lock_irqsave(&musb->lock, flags);
        if (is_on != musb->softconnect) {
                musb->softconnect = is_on;
-               musb_pullup(musb, is_on);
+               schedule_delayed_work(&musb->gadget_work, 0);
        }
        spin_unlock_irqrestore(&musb->lock, flags);
 
-       pm_runtime_put(musb->controller);
-
        return 0;
 }
 
@@ -1845,7 +1855,7 @@ int musb_gadget_setup(struct musb *musb)
 #elif IS_ENABLED(CONFIG_USB_MUSB_GADGET)
        musb->g.is_otg = 0;
 #endif
-
+       INIT_DELAYED_WORK(&musb->gadget_work, musb_gadget_work);
        musb_g_init_endpoints(musb);
 
        musb->is_active = 0;
@@ -1866,6 +1876,8 @@ void musb_gadget_cleanup(struct musb *musb)
 {
        if (musb->port_mode == MUSB_PORT_MODE_HOST)
                return;
+
+       cancel_delayed_work_sync(&musb->gadget_work);
        usb_del_gadget_udc(&musb->g);
 }