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authorAlan Stern <stern@rowland.harvard.edu>2008-12-31 11:31:33 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-01-07 10:00:13 -0800
commit2caf7fcdb8532045680f06b67b9e63f0c9613aaa (patch)
treed9faee328532a3badd73d20e175259e8bdea271a /Documentation/input/joystick-api.txt
parentdf718962bf91c7bd345060aadaa24b03f6140b07 (diff)
USB: re-enable interface after driver unbinds
This patch (as1197) fixes an error introduced recently. Since a significant number of devices can't handle Set-Interface requests, we no longer call usb_set_interface() when a driver unbinds from an interface, provided the interface is already in altsetting 0. However the interface still does get disabled, and the call to usb_set_interface() was the only thing re-enabling it. Since the interface doesn't get re-enabled, further attempts to use it fail. So the patch adds a call to usb_enable_interface() when a driver unbinds and the interface is in altsetting 0. For this to work right, the interface's endpoints have to be re-enabled but their toggles have to be left alone. Therefore an additional argument is added to usb_enable_endpoint() and usb_enable_interface(), a flag indicating whether or not the endpoint toggles should be reset. This is a forward-ported version of a patch which fixes Bugzilla #12301. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Reported-by: David Roka <roka@dawid.hu> Reported-by: Erik Ekman <erik@kryo.se> Tested-by: Erik Ekman <erik@kryo.se> Tested-by: Alon Bar-Lev <alon.barlev@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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