linux-kernel - [PATCH 14/26] usb: gadget: f_phonet: eliminate abuse of ep->driver data

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Message-id: <1442327229-28320-15-git-send-email-r.baldyga@samsung.com>
Date:	Tue, 15 Sep 2015 16:26:57 +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 14/26] usb: gadget: f_phonet: 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_phonet we only need to store in ep->driver_data pointer to
struct f_phonet, as it's used in pn_tx_complete() and pn_rx_complete()
callbacks. All other uses of ep->driver_data are now meaningless and can
be safely removed.

Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
 drivers/usb/gadget/function/f_phonet.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/usb/gadget/function/f_phonet.c b/drivers/usb/gadget/function/f_phonet.c
index c0c3ef2..62a1987 100644
--- a/drivers/usb/gadget/function/f_phonet.c
+++ b/drivers/usb/gadget/function/f_phonet.c
@@ -418,7 +418,7 @@ static int pn_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 
 		spin_lock(&port->lock);
 
-		if (fp->in_ep->driver_data)
+		if (fp->in_ep->enabled)
 			__pn_reset(f);
 
 		if (alt == 1) {
@@ -530,13 +530,11 @@ static int pn_bind(struct usb_configuration *c, struct usb_function *f)
 	if (!ep)
 		goto err;
 	fp->out_ep = ep;
-	ep->driver_data = fp; /* Claim */
 
 	ep = usb_ep_autoconfig(gadget, &pn_fs_source_desc);
 	if (!ep)
 		goto err;
 	fp->in_ep = ep;
-	ep->driver_data = fp; /* Claim */
 
 	pn_hs_sink_desc.bEndpointAddress = pn_fs_sink_desc.bEndpointAddress;
 	pn_hs_source_desc.bEndpointAddress = pn_fs_source_desc.bEndpointAddress;
@@ -575,10 +573,6 @@ err_req:
 		usb_ep_free_request(fp->out_ep, fp->out_reqv[i]);
 	usb_free_all_descriptors(f);
 err:
-	if (fp->out_ep)
-		fp->out_ep->driver_data = NULL;
-	if (fp->in_ep)
-		fp->in_ep->driver_data = NULL;
 	ERROR(cdev, "USB CDC Phonet: cannot autoconfigure\n");
 	return status;
 }
-- 
1.9.1

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