On Tue, Mar 01, 2011 at 04:36:53PM +0100, Pavol Kurina wrote:
> Am 28.02.2011 09:43, schrieb Felipe Balbi:
> >On Fri, Feb 25, 2011 at 07:41:47PM +0000, Pavol Kurina wrote:
> >>Felipe Balbi<balbi<at> ti.com> writes:
> >>>struct usb_request's list_head is supposed to be
> >>>used only by gadget drivers, but musb is abusing
> >>>that. Give struct musb_request its own list_head
> >>>and prevent musb from poking into other driver's
> >>>business.
> >>Hi,
> >>
> >>I think, the patch misses to fix the usage of
> >>"request->list" in musb_gadget_dequeue in
> >>musb_gadget.c.
> >>
> >>I found out by having troubles with f_mass_storage.
> >>It needs musb_gadget_dequeue to work properly...
> >>
> >>I backported the patch to android-2.6.35 kernel on a
> >>omap4 system and also fixed the musb_gadget_dequeue
> >>there so f_mass_storage seem to work at least there
> >>now...
> >>
> >>Can you check this patch regarding some missing bits
> >>please?
> >Looks like we need some extra tests to be added to g_zero, I tested with
> >g_zero and it didn't find that problem. Anyway, here's a patch which
> >probably fixes what you need to be fixed. Would you test it for me ?
> >
> >diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
> >index da8c93b..bf88a61 100644
> >--- a/drivers/usb/musb/musb_gadget.c
> >+++ b/drivers/usb/musb/musb_gadget.c
> >@@ -1274,7 +1274,8 @@ cleanup:
> > static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request
> > *request)
> > {
> > struct musb_ep *musb_ep = to_musb_ep(ep);
> >- struct usb_request *r;
> >+ struct musb_request req = to_musb_request(request);
> >+ struct musb_request *r;
> > unsigned long flags;
> > int status = 0;
> > struct musb *musb = musb_ep->musb;
> >@@ -1285,10 +1286,10 @@ static int musb_gadget_dequeue(struct usb_ep *ep,
> >struct usb_request *request)
> > spin_lock_irqsave(&musb->lock, flags);
> >
> > list_for_each_entry(r,&musb_ep->req_list, list) {
> >- if (r == request)
> >+ if (r == req)
> > break;
> > }
> >- if (r != request) {
> >+ if (r != req) {
> > DBG(3, "request %p not queued to %s\n", request, ep->name);
> > status = -EINVAL;
> > goto done;
> >
>
> I've tested this on my omap4 system with the android-2.6.35 kernel.
> It seems like f_mass_storage and the f_adb
> work fine.
>
> I've added one more change to your patch.
>
> diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
> index a1e1d24..7877ccc 100755
> --- a/drivers/usb/musb/musb_gadget.c
> +++ b/drivers/usb/musb/musb_gadget.c
> @@ -1250,7 +1250,8 @@ cleanup:
> static int musb_gadget_dequeue(struct usb_ep *ep, struct usb_request
> *request)
> {
> struct musb_ep *musb_ep = to_musb_ep(ep);
> - struct usb_request *r;
> + struct musb_request *req = to_musb_request(request);
> + struct musb_request *r;
> unsigned long flags;
> int status = 0;
> struct musb *musb = musb_ep->musb;
> @@ -1261,17 +1262,17 @@ static int musb_gadget_dequeue(struct usb_ep
> *ep, struct usb_request *request)
> spin_lock_irqsave(&musb->lock, flags);
>
> list_for_each_entry(r, &musb_ep->req_list, list) {
> - if (r == request)
> + if (r == req)
> break;
> }
> - if (r != request) {
> + if (r != req) {
> DBG(3, "request %p not queued to %s\n", request, ep->name);
> status = -EINVAL;
> goto done;
> }
>
> /* if the hardware doesn't have the request, easy ... */
> - if (musb_ep->req_list.next != &request->list || musb_ep->busy)
> + if (musb_ep->req_list.next != &req->list || musb_ep->busy)
> musb_g_giveback(musb_ep, request, -ECONNRESET);
>
I'll fix it before Greg pulls, thanks
--
balbi
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