linux-kernel - [PATCH 07/26] usb: gadget: f_eem: eliminate abuse of ep->driver data

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Message-id: <1442327229-28320-8-git-send-email-r.baldyga@samsung.com>
Date:	Tue, 15 Sep 2015 16:26:50 +0200
From:	Robert Baldyga <r.baldyga@...sung.com>
To:	balbi@...com
Cc:	gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, b.zolnierkie@...sung.com,
	m.szyprowski@...sung.com, andrzej.p@...sung.com,
	Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH 07/26] usb: gadget: f_eem: eliminate abuse of ep->driver data

Since ep->driver_data is not used for endpoint claiming, neither for
enabled/disabled state storing, we can reduce number of places where
we read or modify it's value, as now it has no particular meaning for
function or framework logic.

In case of f_ecm, ep->driver_data was used only for endpoint claiming
and marking endpoints as enabled, so we can simplify code by reducing
it.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/gadget/function/f_eem.c | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/gadget/function/f_eem.c b/drivers/usb/gadget/function/f_eem.c
index c9e90de..9a55757 100644
--- a/drivers/usb/gadget/function/f_eem.c
+++ b/drivers/usb/gadget/function/f_eem.c
@@ -195,11 +195,8 @@ static int eem_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 		goto fail;
 
 	if (intf == eem->ctrl_id) {
-
-		if (eem->port.in_ep->driver_data) {
-			DBG(cdev, "reset eem\n");
-			gether_disconnect(&eem->port);
-		}
+		DBG(cdev, "reset eem\n");
+		gether_disconnect(&eem->port);
 
 		if (!eem->port.in_ep->desc || !eem->port.out_ep->desc) {
 			DBG(cdev, "init eem\n");
@@ -237,7 +234,7 @@ static void eem_disable(struct usb_function *f)
 
 	DBG(cdev, "eem deactivated\n");
 
-	if (eem->port.in_ep->driver_data)
+	if (eem->port.in_ep->enabled)
 		gether_disconnect(&eem->port);
 }
 
@@ -293,13 +290,11 @@ static int eem_bind(struct usb_configuration *c, struct usb_function *f)
 	if (!ep)
 		goto fail;
 	eem->port.in_ep = ep;
-	ep->driver_data = cdev;	/* claim */
 
 	ep = usb_ep_autoconfig(cdev->gadget, &eem_fs_out_desc);
 	if (!ep)
 		goto fail;
 	eem->port.out_ep = ep;
-	ep->driver_data = cdev;	/* claim */
 
 	status = -ENOMEM;
 
@@ -325,11 +320,6 @@ static int eem_bind(struct usb_configuration *c, struct usb_function *f)
 	return 0;
 
 fail:
-	if (eem->port.out_ep)
-		eem->port.out_ep->driver_data = NULL;
-	if (eem->port.in_ep)
-		eem->port.in_ep->driver_data = NULL;
-
 	ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
 
 	return status;
-- 
1.9.1

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