USB: cypress_m8: fix port-data memory leak

Fix port-data memory leak by replacing attach and release with
port_probe and port_remove.

Since commit 0998d0631001288 (device-core: Ensure drvdata = NULL when no
driver is bound) the port private data is no longer freed at release as
it is no longer accessible.

Compile-only tested.

Cc: <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 37 insertions, 38 deletions

diff --git a/drivers/usb/serial/cypress_m8.c b/drivers/usb/serial/cypress_m8.c
index 1befce21e173..f0da1279c114 100644
--- a/drivers/usb/serial/cypress_m8.c
+++ b/drivers/usb/serial/cypress_m8.c
@@ -123,10 +123,10 @@ struct cypress_private {
 };
 
 /* function prototypes for the Cypress USB to serial device */
-static int  cypress_earthmate_startup(struct usb_serial *serial);
-static int  cypress_hidcom_startup(struct usb_serial *serial);
-static int  cypress_ca42v2_startup(struct usb_serial *serial);
-static void cypress_release(struct usb_serial *serial);
+static int  cypress_earthmate_port_probe(struct usb_serial_port *port);
+static int  cypress_hidcom_port_probe(struct usb_serial_port *port);
+static int  cypress_ca42v2_port_probe(struct usb_serial_port *port);
+static int  cypress_port_remove(struct usb_serial_port *port);
 static int  cypress_open(struct tty_struct *tty, struct usb_serial_port *port);
 static void cypress_close(struct usb_serial_port *port);
 static void cypress_dtr_rts(struct usb_serial_port *port, int on);
@@ -156,8 +156,8 @@ static struct usb_serial_driver cypress_earthmate_device = {
         .description =                  "DeLorme Earthmate USB",
         .id_table =                     id_table_earthmate,
         .num_ports =                    1,
-        .attach =                       cypress_earthmate_startup,
-        .release =                      cypress_release,
+        .port_probe =                   cypress_earthmate_port_probe,
+        .port_remove =                  cypress_port_remove,
         .open =                         cypress_open,
         .close =                        cypress_close,
         .dtr_rts =                      cypress_dtr_rts,
@@ -182,8 +182,8 @@ static struct usb_serial_driver cypress_hidcom_device = {
         .description =                  "HID->COM RS232 Adapter",
         .id_table =                     id_table_cyphidcomrs232,
         .num_ports =                    1,
-        .attach =                       cypress_hidcom_startup,
-        .release =                      cypress_release,
+        .port_probe =                   cypress_hidcom_port_probe,
+        .port_remove =                  cypress_port_remove,
         .open =                         cypress_open,
         .close =                        cypress_close,
         .dtr_rts =                      cypress_dtr_rts,
@@ -208,8 +208,8 @@ static struct usb_serial_driver cypress_ca42v2_device = {
         .description =                  "Nokia CA-42 V2 Adapter",
         .id_table =                     id_table_nokiaca42v2,
         .num_ports =                    1,
-        .attach =                       cypress_ca42v2_startup,
-        .release =                      cypress_release,
+        .port_probe =                   cypress_ca42v2_port_probe,
+        .port_remove =                  cypress_port_remove,
         .open =                         cypress_open,
         .close =                        cypress_close,
         .dtr_rts =                      cypress_dtr_rts,
@@ -438,10 +438,10 @@ static void cypress_set_dead(struct usb_serial_port *port)
  *****************************************************************************/
 
 
-static int generic_startup(struct usb_serial *serial)
+static int cypress_generic_port_probe(struct usb_serial_port *port)
 {
+        struct usb_serial *serial = port->serial;
         struct cypress_private *priv;
-        struct usb_serial_port *port = serial->port[0];
 
         priv = kzalloc(sizeof(struct cypress_private), GFP_KERNEL);
         if (!priv)
@@ -490,14 +490,16 @@ static int generic_startup(struct usb_serial *serial)
 }
 
 
-static int cypress_earthmate_startup(struct usb_serial *serial)
+static int cypress_earthmate_port_probe(struct usb_serial_port *port)
 {
+        struct usb_serial *serial = port->serial;
         struct cypress_private *priv;
-        struct usb_serial_port *port = serial->port[0];
+        int ret;
 
-        if (generic_startup(serial)) {
+        ret = cypress_generic_port_probe(port);
+        if (ret) {
                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
-                return 1;
+                return ret;
         }
 
         priv = usb_get_serial_port_data(port);
@@ -518,56 +520,53 @@ static int cypress_earthmate_startup(struct usb_serial *serial)
         }
 
         return 0;
-} /* cypress_earthmate_startup */
-
+}
 
-static int cypress_hidcom_startup(struct usb_serial *serial)
+static int cypress_hidcom_port_probe(struct usb_serial_port *port)
 {
         struct cypress_private *priv;
-        struct usb_serial_port *port = serial->port[0];
+        int ret;
 
-        if (generic_startup(serial)) {
+        ret = cypress_generic_port_probe(port);
+        if (ret) {
                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
-                return 1;
+                return ret;
         }
 
         priv = usb_get_serial_port_data(port);
         priv->chiptype = CT_CYPHIDCOM;
 
         return 0;
-} /* cypress_hidcom_startup */
-
+}
 
-static int cypress_ca42v2_startup(struct usb_serial *serial)
+static int cypress_ca42v2_port_probe(struct usb_serial_port *port)
 {
         struct cypress_private *priv;
-        struct usb_serial_port *port = serial->port[0];
+        int ret;
 
-        if (generic_startup(serial)) {
+        ret = cypress_generic_port_probe(port);
+        if (ret) {
                 dev_dbg(&port->dev, "%s - Failed setting up port\n", __func__);
-                return 1;
+                return ret;
         }
 
         priv = usb_get_serial_port_data(port);
         priv->chiptype = CT_CA42V2;
 
         return 0;
-} /* cypress_ca42v2_startup */
-
+}
 
-static void cypress_release(struct usb_serial *serial)
+static int cypress_port_remove(struct usb_serial_port *port)
 {
         struct cypress_private *priv;
 
-        /* all open ports are closed at this point */
-        priv = usb_get_serial_port_data(serial->port[0]);
+        priv = usb_get_serial_port_data(port);
 
-        if (priv) {
-                kfifo_free(&priv->write_fifo);
-                kfree(priv);
-        }
-}
+        kfifo_free(&priv->write_fifo);
+        kfree(priv);
 
+        return 0;
+}
 
 static int cypress_open(struct tty_struct *tty, struct usb_serial_port *port)
 {