xhci: dbc: Use dbc structure in the request completion instead of xhci_hcd

The dbc request completion callback doesn't need a xhci_hcd pointer.
The only user of the xhci_hcd pointer in dbgtty request callback was
the xhci_warn() function. Change it to dev_warn() instead.

While changing the callback function parameter to dbc in struct
xhci_requeset, move the struct xhci_request declaraion down a bit in the
header file to avoid compiler warinings

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/20200723144530.9992-18-mathias.nyman@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-dbgcap.c

@@ -114,8 +114,7 @@ static void xhci_dbc_giveback(struct dbc_request *req, int status)
 {
 	struct dbc_ep		*dep = req->dep;
 	struct xhci_dbc		*dbc = dep->dbc;
-	struct xhci_hcd		*xhci = dbc->xhci;
-	struct device		*dev = xhci_to_hcd(dbc->xhci)->self.sysdev;
+	struct device		*dev = dbc->dev;
 
 	list_del_init(&req->list_pending);
 	req->trb_dma = 0;
@@ -133,7 +132,7 @@ static void xhci_dbc_giveback(struct dbc_request *req, int status)
 
 	/* Give back the transfer request: */
 	spin_unlock(&dbc->lock);
-	req->complete(xhci, req);
+	req->complete(dbc, req);
 	spin_lock(&dbc->lock);
 }
 

drivers/usb/host/xhci-dbgcap.h

@@ -84,23 +84,6 @@ enum dbc_state {
 	DS_STALLED,
 };
 
-struct dbc_request {
-	void				*buf;
-	unsigned int			length;
-	dma_addr_t			dma;
-	void				(*complete)(struct xhci_hcd *xhci,
-						    struct dbc_request *req);
-	struct list_head		list_pool;
-	int				status;
-	unsigned int			actual;
-
-	struct dbc_ep			*dep;
-	struct list_head		list_pending;
-	dma_addr_t			trb_dma;
-	union xhci_trb			*trb;
-	unsigned			direction:1;
-};
-
 struct dbc_ep {
 	struct xhci_dbc			*dbc;
 	struct list_head		list_pending;
@@ -154,6 +137,23 @@ struct xhci_dbc {
 	struct dbc_port			port;
 };
 
+struct dbc_request {
+	void				*buf;
+	unsigned int			length;
+	dma_addr_t			dma;
+	void				(*complete)(struct xhci_dbc *dbc,
+						    struct dbc_request *req);
+	struct list_head		list_pool;
+	int				status;
+	unsigned int			actual;
+
+	struct dbc_ep			*dep;
+	struct list_head		list_pending;
+	dma_addr_t			trb_dma;
+	union xhci_trb			*trb;
+	unsigned			direction:1;
+};
+
 #define dbc_bulkout_ctx(d)		\
 	((struct xhci_ep_ctx *)((d)->ctx->bytes + DBC_CONTEXT_SIZE))
 #define dbc_bulkin_ctx(d)		\

drivers/usb/host/xhci-dbgtty.c

@@ -91,10 +91,9 @@ static void dbc_start_rx(struct dbc_port *port)
 }
 
 static void
-dbc_read_complete(struct xhci_hcd *xhci, struct dbc_request *req)
+dbc_read_complete(struct xhci_dbc *dbc, struct dbc_request *req)
 {
 	unsigned long		flags;
-	struct xhci_dbc		*dbc = xhci->dbc;
 	struct dbc_port		*port = &dbc->port;
 
 	spin_lock_irqsave(&port->port_lock, flags);
@@ -103,10 +102,9 @@ dbc_read_complete(struct xhci_hcd *xhci, struct dbc_request *req)
 	spin_unlock_irqrestore(&port->port_lock, flags);
 }
 
-static void dbc_write_complete(struct xhci_hcd *xhci, struct dbc_request *req)
+static void dbc_write_complete(struct xhci_dbc *dbc, struct dbc_request *req)
 {
 	unsigned long		flags;
-	struct xhci_dbc		*dbc = xhci->dbc;
 	struct dbc_port		*port = &dbc->port;
 
 	spin_lock_irqsave(&port->port_lock, flags);
@@ -118,7 +116,7 @@ static void dbc_write_complete(struct xhci_hcd *xhci, struct dbc_request *req)
 	case -ESHUTDOWN:
 		break;
 	default:
-		xhci_warn(xhci, "unexpected write complete status %d\n",
+		dev_warn(dbc->dev, "unexpected write complete status %d\n",
 			  req->status);
 		break;
 	}
@@ -133,7 +131,7 @@ static void xhci_dbc_free_req(struct dbc_ep *dep, struct dbc_request *req)
 
 static int
 xhci_dbc_alloc_requests(struct dbc_ep *dep, struct list_head *head,
-			void (*fn)(struct xhci_hcd *, struct dbc_request *))
+			void (*fn)(struct xhci_dbc *, struct dbc_request *))
 {
 	int			i;
 	struct dbc_request	*req;