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@xxxxxxxxxxxxxxxxxxx>
Tested-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
---
drivers/usb/gadget/udc-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
Index: usb-3.4/drivers/usb/gadget/udc-core.c
===================================================================
--- usb-3.4.orig/drivers/usb/gadget/udc-core.c
+++ usb-3.4/drivers/usb/gadget/udc-core.c
@@ -263,8 +263,8 @@ static void usb_gadget_remove_driver(str
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);
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