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| author | Alan Stern <stern@rowland.harvard.edu> | 2008-12-31 11:31:33 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-01-07 10:00:13 -0800 |
| commit | 2caf7fcdb8532045680f06b67b9e63f0c9613aaa (patch) | |
| tree | d9faee328532a3badd73d20e175259e8bdea271a /drivers/usb/core/usb.c | |
| parent | df718962bf91c7bd345060aadaa24b03f6140b07 (diff) | |
| download | linux-2caf7fcdb8532045680f06b67b9e63f0c9613aaa.tar.gz linux-2caf7fcdb8532045680f06b67b9e63f0c9613aaa.tar.bz2 linux-2caf7fcdb8532045680f06b67b9e63f0c9613aaa.zip | |
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>
Diffstat (limited to 'drivers/usb/core/usb.c')
| -rw-r--r-- | drivers/usb/core/usb.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c index c0821564a3fe..dcfc072630c1 100644 --- a/drivers/usb/core/usb.c +++ b/drivers/usb/core/usb.c @@ -362,7 +362,7 @@ struct usb_device *usb_alloc_dev(struct usb_device *parent, dev->ep0.desc.bLength = USB_DT_ENDPOINT_SIZE; dev->ep0.desc.bDescriptorType = USB_DT_ENDPOINT; /* ep0 maxpacket comes later, from device descriptor */ - usb_enable_endpoint(dev, &dev->ep0); + usb_enable_endpoint(dev, &dev->ep0, true); dev->can_submit = 1; /* Save readable and stable topology id, distinguishing devices |