Hi,
On Thu, Feb 17, 2011 at 04:00:30PM +0300, Sergei Shtylyov wrote:
> >diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
> >index 2fe3046..86decba 100644
> >--- a/drivers/usb/musb/musb_gadget.c
> >+++ b/drivers/usb/musb/musb_gadget.c
> >@@ -1801,90 +1801,95 @@ void musb_gadget_cleanup(struct musb *musb)
> > int usb_gadget_probe_driver(struct usb_gadget_driver *driver,
> > int (*bind)(struct usb_gadget *))
> > {
> >- int retval;
> >- unsigned long flags;
> >- struct musb *musb = the_gadget;
> >+ struct musb *musb = the_gadget;
> >+ unsigned long flags;
> >+ int retval = -EINVAL;
> >
> > if (!driver
> > || driver->speed != USB_SPEED_HIGH
> > || !bind || !driver->setup)
> >- return -EINVAL;
> >+ goto err0;
>
> Not sure what this gains...
>
> >
> > /* driver must be initialized to support peripheral mode */
> > if (!musb) {
> > DBG(1, "%s, no dev??\n", __func__);
> >- return -ENODEV;
> >+ retval = -ENODEV;
> >+ goto err0;
>
> This too...
I don't like the way it is today, and IMO it looks cleaner to have a
error path with goto statements so that we have only one path for error
handling.
> > DBG(3, "registering driver %s\n", driver->function);
> >- spin_lock_irqsave(&musb->lock, flags);
>
> Is it really correct to remove spinlocm protection here?
I'm guessing it won't have any problem. I'm only reading
musb->gadget_driver...
>
> > if (musb->gadget_driver) {
> > DBG(1, "%s is already bound to %s\n",
> > musb_driver_name,
> > musb->gadget_driver->driver.name);
> > retval = -EBUSY;
> >- } else {
> >- musb->gadget_driver = driver;
> >- musb->g.dev.driver =&driver->driver;
> >- driver->driver.bus = NULL;
> >- musb->softconnect = 1;
> >- retval = 0;
> >+ goto err0;
> > }
> >
> >+ spin_lock_irqsave(&musb->lock, flags);
> >+ musb->gadget_driver = driver;
> >+ musb->g.dev.driver =&driver->driver;
> >+ driver->driver.bus = NULL;
> >+ musb->softconnect = 1;
> > spin_unlock_irqrestore(&musb->lock, flags);
> >
> >- if (retval == 0) {
>
> Yeah, I have noticed this too and wanted to change it -- but forgot... :-)
tell me about it. Has been on my TODO list for ages :-p
> >- if (is_otg_enabled(musb)) {
> >- struct usb_hcd *hcd = musb_to_hcd(musb);
> >+ if (is_otg_enabled(musb)) {
> >+ struct usb_hcd *hcd = musb_to_hcd(musb);
> >
> >- DBG(3, "OTG startup...\n");
> >+ DBG(3, "OTG startup...\n");
> >
> >- /* REVISIT: funcall to other code, which also
> >- * handles power budgeting ... this way also
> >- * ensures HdrcStart is indirectly called.
> >- */
> >- retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
> >- if (retval< 0) {
> >- DBG(1, "add_hcd failed, %d\n", retval);
> >- spin_lock_irqsave(&musb->lock, flags);
> >- otg_set_peripheral(musb->xceiv, NULL);
>
> You're removing this call -- is it intentional?
Default state is already peripheral anyway, so there's no point in
having that.
>
> >- musb->gadget_driver = NULL;
> >- musb->g.dev.driver = NULL;
> >- spin_unlock_irqrestore(&musb->lock, flags);
> >- } else {
> >- hcd->self.uses_pio_for_control = 1;
> >- }
> >+ /* REVISIT: funcall to other code, which also
> >+ * handles power budgeting ... this way also
> >+ * ensures HdrcStart is indirectly called.
> >+ */
> >+ retval = usb_add_hcd(musb_to_hcd(musb), -1, 0);
> >+ if (retval < 0) {
> >+ DBG(1, "add_hcd failed, %d\n", retval);
> >+ goto err2;
> > }
> >+
> >+ hcd->self.uses_pio_for_control = 1;
> > }
> >
> >+ return 0;
> >+
> >+err2:
> >+ if (!is_otg_enabled(musb))
> >+ musb_stop(musb);
>
> Hm, this wasn't called before -- you don't describe why it's needed.
I can update the commit log, but basically it's the counterpart of
musb_start(). See that we call:
if (!is_otg_enabled(musb))
musb_start(musb);
so we need to undo that on the error path.
--
balbi
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