usb: add usb_set_intfdata() documentation

USB drivers do not need to call usb_set_intfdata(intf, NULL) in their
usb_driver::disconnect callback because the core already does it in [1].

However, this fact is widely unknown, c.f.:

  $ git grep "usb_set_intfdata(.*NULL)" | wc -l
  215

Especially, setting the interface to NULL before all action completed
can result in a NULL pointer dereference. Not calling
usb_set_intfdata() at all in disconnect() is the safest method.

Add documentation to usb_set_intfdata() to clarify this point.

Also remove the call in usb-skeletion's disconnect() not to confuse
the new comers.

[1] function usb_unbind_interface() from drivers/usb/core/driver.c
Link: https://elixir.bootlin.com/linux/v6.0/source/drivers/usb/core/driver.c#L497
Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/r/20221128102954.3615579-1-mailhol.vincent@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index d87deee3e26e17327b18225f2189e1a35571288d..900a64ad25e4fd09330550bad9cb1b7120cfc615 100644 (file)
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -564,7 +564,6 @@ static void skel_disconnect(struct usb_interface *interface)
        int minor = interface->minor;
 
        dev = usb_get_intfdata(interface);
-       usb_set_intfdata(interface, NULL);
 
        /* give back our minor */
        usb_deregister_dev(interface, &skel_class);

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 9ff1ad4dfad12bf7273d273f596cd750a899b023..d4afeeec1e1afa611f791e137c69c0886dce3c58 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -265,6 +265,18 @@ static inline void *usb_get_intfdata(struct usb_interface *intf)
        return dev_get_drvdata(&intf->dev);
 }
 
+/**
+ * usb_set_intfdata() - associate driver-specific data with the interface
+ * @intf: the usb interface
+ * @data: pointer to the device priv structure or %NULL
+ *
+ * Drivers should use this function in their probe() to associate their
+ * driver-specific data with the usb interface.
+ *
+ * When disconnecting, the core will take care of setting @intf back to %NULL,
+ * so no actions are needed on the driver side. The interface should not be set
+ * to %NULL before all actions completed (e.g. no outsanding URB remaining).
+ */
 static inline void usb_set_intfdata(struct usb_interface *intf, void *data)
 {
        dev_set_drvdata(&intf->dev, data);