Input: walkera0701 - use proper error codes

We have been using -EBUSY where we should have used -EIO or -ENOMEM,
so let's fix that and also add some diagnostic messages.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 36 insertions, 20 deletions

diff --git a/drivers/input/joystick/walkera0701.c b/drivers/input/joystick/walkera0701.c
index da657e63a223..b86134c0b299 100644
--- a/drivers/input/joystick/walkera0701.c
+++ b/drivers/input/joystick/walkera0701.c
@@ -197,37 +197,51 @@ static void walkera0701_close(struct input_dev *dev)
 
 static int walkera0701_connect(struct walkera_dev *w, int parport)
 {
-        int err = -ENODEV;
+        int error;
 
         w->parport = parport_find_number(parport);
-        if (w->parport == NULL)
+        if (!w->parport) {
+                pr_err("parport %d does not exist\n", parport);
                 return -ENODEV;
+        }
 
         if (w->parport->irq == -1) {
                 pr_err("parport %d does not have interrupt assigned\n",
                         parport);
-                goto init_err;
+                error = -EINVAL;
+                goto err_put_parport;
         }
 
-        err = -EBUSY;
         w->pardevice = parport_register_device(w->parport, "walkera0701",
                                     NULL, NULL, walkera0701_irq_handler,
                                     PARPORT_DEV_EXCL, w);
-        if (!w->pardevice)
-                goto init_err;
+        if (!w->pardevice) {
+                pr_err("failed to register parport device\n");
+                error = -EIO;
+                goto err_put_parport;
+        }
 
-        if (parport_negotiate(w->pardevice->port, IEEE1284_MODE_COMPAT))
-                goto init_err1;
+        if (parport_negotiate(w->pardevice->port, IEEE1284_MODE_COMPAT)) {
+                pr_err("failed to negotiate parport mode\n");
+                error = -EIO;
+                goto err_unregister_device;
+        }
 
-        if (parport_claim(w->pardevice))
-                goto init_err1;
+        if (parport_claim(w->pardevice)) {
+                pr_err("failed to claim parport\n");
+                error = -EBUSY;
+                goto err_unregister_device;
+        }
 
         hrtimer_init(&w->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
         w->timer.function = timer_handler;
 
         w->input_dev = input_allocate_device();
-        if (!w->input_dev)
-                goto init_err2;
+        if (!w->input_dev) {
+                pr_err("failed to allocate input device\n");
+                error = -ENOMEM;
+                goto err_release_parport;
+        }
 
         input_set_drvdata(w->input_dev, w);
         w->input_dev->name = "Walkera WK-0701 TX";
@@ -252,21 +266,23 @@ static int walkera0701_connect(struct walkera_dev *w, int parport)
         input_set_abs_params(w->input_dev, ABS_RUDDER, -512, 512, 0, 0);
         input_set_abs_params(w->input_dev, ABS_MISC, -512, 512, 0, 0);
 
-        err = input_register_device(w->input_dev);
-        if (err)
-                goto init_err3;
+        error = input_register_device(w->input_dev);
+        if (error) {
+                pr_err("failed to register input device\n");
+                goto err_free_input_dev;
+        }
 
         return 0;
 
- init_err3:
+err_free_input_dev:
         input_free_device(w->input_dev);
- init_err2:
+err_release_parport:
         parport_release(w->pardevice);
- init_err1:
+err_unregister_device:
         parport_unregister_device(w->pardevice);
- init_err:
+err_put_parport:
         parport_put_port(w->parport);
-        return err;
+        return error;
 }
 
 static void walkera0701_disconnect(struct walkera_dev *w)