usb: gadget: f_acm: 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_acm we only need to store in ep->driver_data pointer to
struct f_acm, as it's used in acm_complete_set_line_coding() callback.
All other uses of ep->driver_data are now meaningless and can be safely
removed.

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

diff --git a/drivers/usb/gadget/function/f_acm.c b/drivers/usb/gadget/function/f_acm.c
index be9df09fde26508c6b658cd0686681fb43e1d4bb..22e723d12d36ff4a6a24b07b703ac6172cf799ba 100644 (file)
--- a/drivers/usb/gadget/function/f_acm.c
+++ b/drivers/usb/gadget/function/f_acm.c
@@ -428,21 +428,18 @@ static int acm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
        /* we know alt == 0, so this is an activation or a reset */
 
        if (intf == acm->ctrl_id) {
-               if (acm->notify->driver_data) {
-                       dev_vdbg(&cdev->gadget->dev,
-                                "reset acm control interface %d\n", intf);
-                       usb_ep_disable(acm->notify);
-               }
+               dev_vdbg(&cdev->gadget->dev,
+                               "reset acm control interface %d\n", intf);
+               usb_ep_disable(acm->notify);
 
                if (!acm->notify->desc)
                        if (config_ep_by_speed(cdev->gadget, f, acm->notify))
                                return -EINVAL;
 
                usb_ep_enable(acm->notify);
-               acm->notify->driver_data = acm;
 
        } else if (intf == acm->data_id) {
-               if (acm->port.in->driver_data) {
+               if (acm->notify->enabled) {
                        dev_dbg(&cdev->gadget->dev,
                                "reset acm ttyGS%d\n", acm->port_num);
                        gserial_disconnect(&acm->port);
@@ -475,7 +472,6 @@ static void acm_disable(struct usb_function *f)
        dev_dbg(&cdev->gadget->dev, "acm ttyGS%d deactivated\n", acm->port_num);
        gserial_disconnect(&acm->port);
        usb_ep_disable(acm->notify);
-       acm->notify->driver_data = NULL;
 }
 
 /*-------------------------------------------------------------------------*/
@@ -655,19 +651,16 @@ acm_bind(struct usb_configuration *c, struct usb_function *f)
        if (!ep)
                goto fail;
        acm->port.in = ep;
-       ep->driver_data = cdev; /* claim */
 
        ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_out_desc);
        if (!ep)
                goto fail;
        acm->port.out = ep;
-       ep->driver_data = cdev; /* claim */
 
        ep = usb_ep_autoconfig(cdev->gadget, &acm_fs_notify_desc);
        if (!ep)
                goto fail;
        acm->notify = ep;
-       ep->driver_data = cdev; /* claim */
 
        /* allocate notification */
        acm->notify_req = gs_alloc_req(ep,
@@ -709,14 +702,6 @@ fail:
        if (acm->notify_req)
                gs_free_req(acm->notify, acm->notify_req);
 
-       /* we might as well release our claims on endpoints */
-       if (acm->notify)
-               acm->notify->driver_data = NULL;
-       if (acm->port.out)
-               acm->port.out->driver_data = NULL;
-       if (acm->port.in)
-               acm->port.in->driver_data = NULL;
-
        ERROR(cdev, "%s/%p: can't bind, err %d\n", f->name, f, status);
 
        return status;