diff options
| author | Alan Stern <stern@rowland.harvard.edu> | 2012-04-26 11:31:57 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-05-12 09:32:22 -0700 |
| commit | 59da83377222910347425ec225cf3a665e0c8e1b (patch) | |
| tree | c7acd4d8cbf4a675e9f91716e62cb63b05a6b29e | |
| parent | 804596fcfa2946ea83737346290f806651cd69ea (diff) | |
usb: gadget: udc-core: fix incompatibility with dummy-hcd
commit 320cd1e750f1bf3e47eb41209dcb2be07264cb76 upstream.
This patch (as1548) fixes a recently-introduced incompatibility
between the UDC core and the dummy-hcd driver. Commit
8ae8090c82eb407267001f75b3d256b3bd4ae691 (usb: gadget: udc-core: fix
asymmetric calls in remove_driver) moved the usb_gadget_udc_stop()
call in usb_gadget_remove_driver() below the usb_gadget_disconnect()
call.
As a result, usb_gadget_disconnect() gets called at a time when the
gadget driver believes it has been unbound but dummy-hcd believes
it has not. A nasty error ensues when dummy-hcd calls the gadget
driver's disconnect method a second time.
To fix the problem, this patch moves the gadget driver's unbind
notification after the usb_gadget_disconnect() call. Now nothing
happens between the two unbind notifications, so nothing goes wrong.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/gadget/udc-core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/gadget/udc-core.c b/drivers/usb/gadget/udc-core.c index 3ea783de96b5..4e2e13eb14bb 100644 --- a/drivers/usb/gadget/udc-core.c +++ b/drivers/usb/gadget/udc-core.c @@ -211,8 +211,8 @@ static void usb_gadget_remove_driver(struct usb_udc *udc) if (udc_is_newstyle(udc)) { udc->driver->disconnect(udc->gadget); - udc->driver->unbind(udc->gadget); usb_gadget_disconnect(udc->gadget); + udc->driver->unbind(udc->gadget); usb_gadget_udc_stop(udc->gadget, udc->driver); } else { usb_gadget_stop(udc->gadget, udc->driver); |