USB: UDC core: Add udc_async_callbacks gadget op

The Gadget API has a theoretical race when a gadget driver is unbound.
Although the pull-up is turned off before the driver's ->unbind
callback runs, if the USB cable were to be unplugged at just the wrong
moment there would be nothing to prevent the UDC driver from invoking
the ->disconnect callback after the unbind has finished.  In theory,
other asynchronous callbacks could also happen during the time before
the UDC driver's udc_stop routine is called, and the gadget driver
would not be prepared to handle any of them.

We need a way to tell UDC drivers to stop issuing asynchronous (that is,
->suspend, ->resume, ->disconnect, ->reset, or ->setup) callbacks at
some point after the pull-up has been turned off and before the
->unbind callback runs.  This patch adds a new ->udc_async_callbacks
callback to the usb_gadget_ops structure for precisely this purpose,
and it adds the corresponding support to the UDC core.

Later patches in this series add support for udc_async_callbacks to
several UDC drivers.

Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20210520202144.GC1216852@rowland.harvard.edu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c
index 493ff93..b7f0b1e 100644 (file)
--- a/drivers/usb/gadget/udc/core.c
+++ b/drivers/usb/gadget/udc/core.c
@@ -1148,6 +1148,53 @@ static inline void usb_gadget_udc_set_speed(struct usb_udc *udc,
 }
 
 /**
+ * usb_gadget_enable_async_callbacks - tell usb device controller to enable asynchronous callbacks
+ * @udc: The UDC which should enable async callbacks
+ *
+ * This routine is used when binding gadget drivers.  It undoes the effect
+ * of usb_gadget_disable_async_callbacks(); the UDC driver should enable IRQs
+ * (if necessary) and resume issuing callbacks.
+ *
+ * This routine will always be called in process context.
+ */
+static inline void usb_gadget_enable_async_callbacks(struct usb_udc *udc)
+{
+       struct usb_gadget *gadget = udc->gadget;
+
+       if (gadget->ops->udc_async_callbacks)
+               gadget->ops->udc_async_callbacks(gadget, true);
+}
+
+/**
+ * usb_gadget_disable_async_callbacks - tell usb device controller to disable asynchronous callbacks
+ * @udc: The UDC which should disable async callbacks
+ *
+ * This routine is used when unbinding gadget drivers.  It prevents a race:
+ * The UDC driver doesn't know when the gadget driver's ->unbind callback
+ * runs, so unless it is told to disable asynchronous callbacks, it might
+ * issue a callback (such as ->disconnect) after the unbind has completed.
+ *
+ * After this function runs, the UDC driver must suppress all ->suspend,
+ * ->resume, ->disconnect, ->reset, and ->setup callbacks to the gadget driver
+ * until async callbacks are again enabled.  A simple-minded but effective
+ * way to accomplish this is to tell the UDC hardware not to generate any
+ * more IRQs.
+ *
+ * Request completion callbacks must still be issued.  However, it's okay
+ * to defer them until the request is cancelled, since the pull-up will be
+ * turned off during the time period when async callbacks are disabled.
+ *
+ * This routine will always be called in process context.
+ */
+static inline void usb_gadget_disable_async_callbacks(struct usb_udc *udc)
+{
+       struct usb_gadget *gadget = udc->gadget;
+
+       if (gadget->ops->udc_async_callbacks)
+               gadget->ops->udc_async_callbacks(gadget, false);
+}
+
+/**
  * usb_udc_release - release the usb_udc struct
  * @dev: the dev member within usb_udc
  *
@@ -1361,6 +1408,7 @@ static void usb_gadget_remove_driver(struct usb_udc *udc)
        kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 
        usb_gadget_disconnect(udc->gadget);
+       usb_gadget_disable_async_callbacks(udc);
        if (udc->gadget->irq)
                synchronize_irq(udc->gadget->irq);
        udc->driver->unbind(udc->gadget);
@@ -1442,6 +1490,7 @@ static int udc_bind_to_driver(struct usb_udc *udc, struct usb_gadget_driver *dri
                driver->unbind(udc->gadget);
                goto err1;
        }
+       usb_gadget_enable_async_callbacks(udc);
        usb_udc_connect_control(udc);
 
        kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);

diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 8811eb9..75c7538 100644 (file)
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -325,6 +325,7 @@ struct usb_gadget_ops {
        void    (*udc_set_speed)(struct usb_gadget *, enum usb_device_speed);
        void    (*udc_set_ssp_rate)(struct usb_gadget *gadget,
                        enum usb_ssp_rate rate);
+       void    (*udc_async_callbacks)(struct usb_gadget *gadget, bool enable);
        struct usb_ep *(*match_ep)(struct usb_gadget *,
                        struct usb_endpoint_descriptor *,
                        struct usb_ss_ep_comp_descriptor *);