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usb: musb: fix hanging when rmmod gadget driver

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If we try to modprobe a second gadget driver before
rmmoding the first one, the reference for the first
gadget driver would get NULLed avoiding usb to change
gadget drivers later.

Cc: David Brownell <david-b@pacbell.net>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Felipe Balbi 2008-08-04 13:53:52 +03:00 committed by Greg Kroah-Hartman
parent 550a7375fe
commit f362a47560
1 changed files with 8 additions and 10 deletions
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18
drivers/usb/musb/musb_gadget.c
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@ -1710,17 +1710,15 @@ int usb_gadget_register_driver(struct usb_gadget_driver *driver)
spin_unlock_irqrestore(&musb->lock, flags);
if (retval == 0)
retval = driver->bind(&musb->g);
if (retval != 0) {
DBG(3, "bind to driver %s failed --> %d\n",
driver->driver.name, retval);
musb->gadget_driver = NULL;
musb->g.dev.driver = NULL;
}
/* start peripheral and/or OTG engines */
if (retval == 0) {
retval = driver->bind(&musb->g);
if (retval != 0) {
DBG(3, "bind to driver %s failed --> %d\n",
driver->driver.name, retval);
musb->gadget_driver = NULL;
musb->g.dev.driver = NULL;
}
spin_lock_irqsave(&musb->lock, flags);
/* REVISIT always use otg_set_peripheral(), handling