xhci: dbgtty: Pass dbc pointer when registering a dbctty device

Pass dbc pointer to the xhci_dbc_tty_register_device() and
xhci_dbc_tty_unregister_device() functions instead of xhci_hcd pointer

These functions don't need a xhci_hcd pointer anymore, only use case was
the xhci_err() function, which is now changed to a dev_err() instead.

No functional changes
This change helps decoupling xhci and DbC
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200723144530.9992-16-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-dbgcap.c

@@ -545,7 +545,7 @@ static void xhci_dbc_stop(struct xhci_hcd *xhci)
 	cancel_delayed_work_sync(&dbc->event_work);
 
 	if (port->registered)
-		xhci_dbc_tty_unregister_device(xhci);
+		xhci_dbc_tty_unregister_device(dbc);
 
 	spin_lock_irqsave(&dbc->lock, flags);
 	ret = xhci_do_dbc_stop(dbc);
@@ -789,10 +789,8 @@ static void xhci_dbc_handle_events(struct work_struct *work)
 	enum evtreturn		evtr;
 	struct xhci_dbc		*dbc;
 	unsigned long		flags;
-	struct xhci_hcd		*xhci;
 
 	dbc = container_of(to_delayed_work(work), struct xhci_dbc, event_work);
-	xhci = dbc->xhci;
 
 	spin_lock_irqsave(&dbc->lock, flags);
 	evtr = xhci_dbc_do_handle_events(dbc);
@@ -800,7 +798,7 @@ static void xhci_dbc_handle_events(struct work_struct *work)
 
 	switch (evtr) {
 	case EVT_GSER:
-		ret = xhci_dbc_tty_register_device(xhci);
+		ret = xhci_dbc_tty_register_device(dbc);
 		if (ret) {
 			dev_err(dbc->dev, "failed to alloc tty device\n");
 			break;
@@ -809,7 +807,7 @@ static void xhci_dbc_handle_events(struct work_struct *work)
 		dev_info(dbc->dev, "DbC now attached to /dev/ttyDBC0\n");
 		break;
 	case EVT_DISC:
-		xhci_dbc_tty_unregister_device(xhci);
+		xhci_dbc_tty_unregister_device(dbc);
 		break;
 	case EVT_DONE:
 		break;

drivers/usb/host/xhci-dbgcap.h

@@ -198,8 +198,8 @@ int xhci_dbc_init(struct xhci_hcd *xhci);
 void xhci_dbc_exit(struct xhci_hcd *xhci);
 int xhci_dbc_tty_register_driver(struct xhci_hcd *xhci);
 void xhci_dbc_tty_unregister_driver(void);
-int xhci_dbc_tty_register_device(struct xhci_hcd *xhci);
-void xhci_dbc_tty_unregister_device(struct xhci_hcd *xhci);
+int xhci_dbc_tty_register_device(struct xhci_dbc *dbc);
+void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc);
 struct dbc_request *dbc_alloc_request(struct dbc_ep *dep, gfp_t gfp_flags);
 void dbc_free_request(struct dbc_ep *dep, struct dbc_request *req);
 int dbc_ep_queue(struct dbc_ep *dep, struct dbc_request *req, gfp_t gfp_flags);

drivers/usb/host/xhci-dbgtty.c

@@ -440,11 +440,10 @@ xhci_dbc_tty_exit_port(struct dbc_port *port)
 	tty_port_destroy(&port->port);
 }
 
-int xhci_dbc_tty_register_device(struct xhci_hcd *xhci)
+int xhci_dbc_tty_register_device(struct xhci_dbc *dbc)
 {
 	int			ret;
 	struct device		*tty_dev;
-	struct xhci_dbc		*dbc = xhci->dbc;
 	struct dbc_port		*port = &dbc->port;
 
 	xhci_dbc_tty_init_port(xhci, port);
@@ -484,14 +483,13 @@ int xhci_dbc_tty_register_device(struct xhci_hcd *xhci)
 register_fail:
 	xhci_dbc_tty_exit_port(port);
 
-	xhci_err(xhci, "can't register tty port, err %d\n", ret);
+	dev_err(dbc->dev, "can't register tty port, err %d\n", ret);
 
 	return ret;
 }
 
-void xhci_dbc_tty_unregister_device(struct xhci_hcd *xhci)
+void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
 {
-	struct xhci_dbc		*dbc = xhci->dbc;
 	struct dbc_port		*port = &dbc->port;
 
 	tty_unregister_device(dbc_tty_driver, 0);