linux-kernel - [PATCH] usb: gadget: fix possible regression introduced with ep->claimed

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Message-id: <1440147689-1157-1-git-send-email-r.baldyga@samsung.com>
Date:	Fri, 21 Aug 2015 11:01:29 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	stern@...land.harvard.edu, r.baldyga@...kerion.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH] usb: gadget: fix possible regression introduced with
 ep->claimed

This patch fixes possible regression introduced by patch reworking endpoint
claiming mechanism. It restores setring ep->driver_data to NULL in
usb_ep_autoconfig_reset(), which was removed by patch [1].

[1] commit cc476b42a39d ("usb: gadget: encapsulate endpoint claiming
    mechanism")

Reported-by: Felipe Balbi <balbi@...com>
Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---

Hi Felipe,

I was not able to reproduce the problem that you have described (functions
trying to enable eps that are already enabled, and disable eps that are
already disabled), but I have analysed the problem and I have concluded
that the only possible cause of regression can be that my patch removed
setting ep->driver_data to NULL in usb_ep_autoconfig_reset() function.
Because of this change initial state of ep->driver_data could be non-NULL
value, which could change behavoiur of some functions. I can't imagine
any other possible cause of regression introduced by such simple patch.

Thanks,
Robert

 drivers/usb/gadget/epautoconf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index 978435a..6399c10 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -186,6 +186,7 @@ void usb_ep_autoconfig_reset (struct usb_gadget *gadget)

 	list_for_each_entry (ep, &gadget->ep_list, ep_list) {
 		ep->claimed = false;
+		ep->driver_data = NULL;
 	}
 	gadget->in_epnum = 0;
 	gadget->out_epnum = 0;
-- 
1.9.1

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