Hi,
On Thu, Aug 20, 2015 at 07:16:48PM +0200, Robert Baldyga wrote:
> On 08/20/2015 06:48 PM, Felipe Balbi wrote:
> >On Thu, Aug 20, 2015 at 06:28:14PM +0200, Robert Baldyga wrote:
> >>Hi Felipe,
> >>
> >>On 08/20/2015 05:35 PM, Felipe Balbi wrote:
> >>[...]
> >>>just letting you know that this regresses all gadget drivers making them
> >>>try to disable previously disabled endpoints and enable previously
> >>>enabled endpoints.
> >>>
> >>>I have a possible fix (see below) but then it shows a problem on the
> >>>host side when using with g_zero (see further below):
> >>>
> >>>commit 3b8932100aacb6cfbffe288ca93025d8b8430c00
> >>>Author: Felipe Balbi <balbi@xxxxxx>
> >>>Date: Wed Aug 19 18:05:27 2015 -0500
> >>>
> >>> usb: gadget: fix ep->claimed lifetime
> >>>
> >>> In order to fix a regression introduced by commit
> >>> cc476b42a39d ("usb: gadget: encapsulate endpoint
> >>> claiming mechanism") we have to introduce a simple
> >>> helper to check if a particular is enabled or not.
> >>>
> >>> After that, we need to move ep->claimed lifetime to
> >>> usb_ep_enable() and usb_ep_disable() since those
> >>> are the only functions which actually enable and
> >>> disable endpoints.
> >>>
> >>> A follow-up patch will come to drop all driver_data
> >>> checks from function drivers, since those are, now,
> >>> pointless.
> >>>
> >>> Fixes: cc476b42a39d ("usb: gadget: encapsulate endpoint
> >>> claiming mechanism")
> >>> Cc: Robert Baldyga <r.baldyga@xxxxxxxxxxx>
> >>> Signed-off-by: Felipe Balbi <balbi@xxxxxx>
> >>>
> >>>diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
> >>>index 978435a51038..ad45070cd76f 100644
> >>>--- a/drivers/usb/gadget/epautoconf.c
> >>>+++ b/drivers/usb/gadget/epautoconf.c
> >>>@@ -126,7 +126,6 @@ found_ep:
> >>> ep->address = desc->bEndpointAddress;
> >>> ep->desc = NULL;
> >>> ep->comp_desc = NULL;
> >>>- ep->claimed = true;
> >>
> >>Removing this line causes autoconfig can return the same endpoint many
> >>times. This probably causes problems with g_zero.
> >>
> >>I will try to fix it ASAP.
> >
> >I was considering the same thing, but the lifetime of ->claimed doesn't
> >look correct to me either way. Note that once the flag is enabled, it
> >won't get disabled by most gadget drivers.
>
> And it should not be. This flag is indicator, that endpoint is used by some
> function. It should be set once by usb_ep_autoconfig() and cleared by
> usb_ep_autoconfig_reset().
have you considered switching interfaces and/or alternate settings ?
> I wonder what is reason of this enable/disable regression. Maybe the problem
> is that we don't set ep->driver_data to NULL in usb_ep_autoconfig_reset()
> (so far it was done). Does this problem occur while gadget is binded to UDC
> for the first time, or at any next time? Unfortunately at this moment I
> don't have access to my hardware, so it will take a moment before I will
> setup some testing environment.
yeah, that's okay. We've got time.
--
balbi
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