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usb: gadget: udc-core: fix asymmetric calls in remove_driver

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During modprobe of gadget driver, pullup is called after
udc_start. In order to make the exit path symmetric when
removing a gadget driver, call pullup before ->udc_stop.

This is needed to avoid issues with PM where udc_stop
disables the module completely (put IP in reset state,
cut functional and interface clocks, and so on), which
prevents us from accessing the IP's address space,
thus creating the possibility of an abort exception
when we try to access IP's address space after clocks
are off.

Cc: stable@vger.kernel.org
Signed-off-by: Partha Basak <p-basak2@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Kishon Vijay Abraham I 2012-03-21 21:34:30 +05:30 committed by Felipe Balbi
parent 3006dc8c62
commit 8ae8090c82
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/udc-core.c
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@ -264,8 +264,8 @@ 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_udc_stop(udc->gadget, udc->driver);
usb_gadget_disconnect(udc->gadget);
usb_gadget_udc_stop(udc->gadget, udc->driver);
} else {
usb_gadget_stop(udc->gadget, udc->driver);
}