xhci: dbc: remove tty specific port structure from struct xhci_dbc

Use a void pointer that any function driver can use instead.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20200723144530.9992-28-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-dbgcap.h b/drivers/usb/host/xhci-dbgcap.h
index 5018b32..c70b78d 100644 (file)
--- a/drivers/usb/host/xhci-dbgcap.h
+++ b/drivers/usb/host/xhci-dbgcap.h
@@ -137,8 +137,8 @@ struct xhci_dbc {
        unsigned                        resume_required:1;
        struct dbc_ep                   eps[2];
 
-       struct dbc_port                 port;
        const struct dbc_driver         *driver;
+       void                            *priv;
 };
 
 struct dbc_request {

diff --git a/drivers/usb/host/xhci-dbgtty.c b/drivers/usb/host/xhci-dbgtty.c
index 3b306a2..0b94211 100644 (file)
--- a/drivers/usb/host/xhci-dbgtty.c
+++ b/drivers/usb/host/xhci-dbgtty.c
@@ -19,6 +19,11 @@ static void dbc_tty_exit(void);
 
 static struct tty_driver *dbc_tty_driver;
 
+static inline struct dbc_port *dbc_to_port(struct xhci_dbc *dbc)
+{
+       return dbc->priv;
+}
+
 static unsigned int
 dbc_send_packet(struct dbc_port *port, char *packet, unsigned int size)
 {
@@ -99,7 +104,7 @@ static void
 dbc_read_complete(struct xhci_dbc *dbc, struct dbc_request *req)
 {
        unsigned long           flags;
-       struct dbc_port         *port = &dbc->port;
+       struct dbc_port         *port = dbc_to_port(dbc);
 
        spin_lock_irqsave(&port->port_lock, flags);
        list_add_tail(&req->list_pool, &port->read_queue);
@@ -110,7 +115,7 @@ dbc_read_complete(struct xhci_dbc *dbc, struct dbc_request *req)
 static void dbc_write_complete(struct xhci_dbc *dbc, struct dbc_request *req)
 {
        unsigned long           flags;
-       struct dbc_port         *port = &dbc->port;
+       struct dbc_port         *port = dbc_to_port(dbc);
 
        spin_lock_irqsave(&port->port_lock, flags);
        list_add(&req->list_pool, &port->write_pool);
@@ -397,7 +402,7 @@ int xhci_dbc_tty_register_device(struct xhci_dbc *dbc)
 {
        int                     ret;
        struct device           *tty_dev;
-       struct dbc_port         *port = &dbc->port;
+       struct dbc_port         *port = dbc_to_port(dbc);
 
        if (port->registered)
                return -EBUSY;
@@ -446,7 +451,7 @@ register_fail:
 
 void xhci_dbc_tty_unregister_device(struct xhci_dbc *dbc)
 {
-       struct dbc_port         *port = &dbc->port;
+       struct dbc_port         *port = dbc_to_port(dbc);
 
        if (!port->registered)
                return;
@@ -468,6 +473,7 @@ static const struct dbc_driver dbc_driver = {
 int xhci_dbc_tty_probe(struct xhci_hcd *xhci)
 {
        struct xhci_dbc         *dbc = xhci->dbc;
+       struct dbc_port         *port;
        int                     status;
 
        /* dbc_tty_init will be called by module init() in the future */
@@ -475,13 +481,20 @@ int xhci_dbc_tty_probe(struct xhci_hcd *xhci)
        if (status)
                return status;
 
+       port = kzalloc(sizeof(*port), GFP_KERNEL);
+       if (!port) {
+               status = -ENOMEM;
+               goto out;
+       }
+
        dbc->driver = &dbc_driver;
+       dbc->priv = port;
+
 
-       dbc_tty_driver->driver_state = &dbc->port;
+       dbc_tty_driver->driver_state = port;
 
        return 0;
 out:
-
        /* dbc_tty_exit will be called by module_exit() in the future */
        dbc_tty_exit();
        return status;
@@ -493,7 +506,11 @@ out:
  */
 void xhci_dbc_tty_remove(struct xhci_dbc *dbc)
 {
+       struct dbc_port         *port = dbc_to_port(dbc);
+
        dbc->driver = NULL;
+       dbc->priv = NULL;
+       kfree(port);
 
        /* dbc_tty_exit will be called by  module_exit() in the future */
        dbc_tty_exit();