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USB: fix interface sysfs file-creation bug

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This patch (as1005) fixes a rather subtle problem.  When
usb_set_configuration() registers the interfaces and their files in
sysfs, it doesn't expect those files to exist already.  But when an
interface is registered, its driver may call usb_set_interface() and
thereby cause the sysfs files to be created.  The result is an error
when usb_set_configuration() goes on to create those same files again.

The (not-so-great) solution is to have usb_set_configuration() remove
any existing files before creating them.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2007-10-19 09:51:58 -04:00 committed by Greg Kroah-Hartman
parent b22817b3c8
commit 439a903a96
1 changed files with 7 additions and 1 deletions
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8
drivers/usb/core/message.c
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@ -1641,7 +1641,13 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
intf->dev.bus_id, ret);
continue;
}
usb_create_sysfs_intf_files (intf);
/* The driver's probe method can call usb_set_interface(),
* which would mean the interface's sysfs files are already
* created. Just in case, we'll remove them first.
*/
usb_remove_sysfs_intf_files(intf);
usb_create_sysfs_intf_files(intf);
}
usb_autosuspend_device(dev);