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().
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.
Thanks,
Robert
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