USB: don't register endpoints for interfaces that are going away

This patch (as1155) fixes a bug in usbcore.  When interfaces are
deleted, either because the device was disconnected or because of a
configuration change, the extra attribute files and child endpoint
devices may get left behind.  This is because the core removes them
before calling device_del().  But during device_del(), after the
driver is unbound the core will reinstall altsetting 0 and recreate
those extra attributes and children.

The patch prevents this by adding a flag to record when the interface
is in the midst of being unregistered.  When the flag is set, the
attribute files and child devices will not be created.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org> [2.6.27, 2.6.26, 2.6.25]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 8877385..6d1048f 100644 (file)
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1091,6 +1091,7 @@ void usb_disable_device(struct usb_device *dev, int skip_ep0)
                                continue;
                        dev_dbg(&dev->dev, "unregistering interface %s\n",
                                dev_name(&interface->dev));
+                       interface->unregistering = 1;
                        usb_remove_sysfs_intf_files(interface);
                        device_del(&interface->dev);
                }

diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index f66fba1..4fb65fd 100644 (file)
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -840,7 +840,7 @@ int usb_create_sysfs_intf_files(struct usb_interface *intf)
        struct usb_host_interface *alt = intf->cur_altsetting;
        int retval;
 
-       if (intf->sysfs_files_created)
+       if (intf->sysfs_files_created || intf->unregistering)
                return 0;
 
        /* The interface string may be present in some altsettings

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 8fa973b..f72aa51 100644 (file)
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -108,6 +108,7 @@ enum usb_interface_condition {
  *     (in probe()), bound to a driver, or unbinding (in disconnect())
  * @is_active: flag set when the interface is bound and not suspended.
  * @sysfs_files_created: sysfs attributes exist
+ * @unregistering: flag set when the interface is being unregistered
  * @needs_remote_wakeup: flag set when the driver requires remote-wakeup
  *     capability during autosuspend.
  * @needs_altsetting0: flag set when a set-interface request for altsetting 0
@@ -163,6 +164,7 @@ struct usb_interface {
        enum usb_interface_condition condition;         /* state of binding */
        unsigned is_active:1;           /* the interface is not suspended */
        unsigned sysfs_files_created:1; /* the sysfs attributes exist */
+       unsigned unregistering:1;       /* unregistration is in progress */
        unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */
        unsigned needs_altsetting0:1;   /* switch to altsetting 0 is pending */
        unsigned needs_binding:1;       /* needs delayed unbind/rebind */