platform/x86/dell/dell-rbtn: Fix resources leaking on error path

Currently rbtn_add() in case of failure is leaking resources. Fix this
by adding a proper rollback. Move devm_kzalloc() before rbtn_acquire(),
so it doesn't require rollback in case of failure. While at it, remove
unnecessary assignment of NULL to device->driver_data and unnecessary
whitespace, plus add a break for the default case in a switch.

Suggested-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Suggested-by: Pali Rohár <pali@kernel.org>
Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
Signed-off-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org>
Reviewed-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20230613084310.2775896-1-michal.wilczynski@intel.com
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/dell/dell-rbtn.c b/drivers/platform/x86/dell/dell-rbtn.c
index aa0e6c90749426c1ecd337c6674b74f8b7fcab62..c8fcb537fd65db7283ac37567e192fbe2c0588ee 100644 (file)
--- a/drivers/platform/x86/dell/dell-rbtn.c
+++ b/drivers/platform/x86/dell/dell-rbtn.c
@@ -395,16 +395,16 @@ static int rbtn_add(struct acpi_device *device)
                return -EINVAL;
        }
 
+       rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
+       if (!rbtn_data)
+               return -ENOMEM;
+
        ret = rbtn_acquire(device, true);
        if (ret < 0) {
                dev_err(&device->dev, "Cannot enable device\n");
                return ret;
        }
 
-       rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
-       if (!rbtn_data)
-               return -ENOMEM;
-
        rbtn_data->type = type;
        device->driver_data = rbtn_data;
 
@@ -420,10 +420,12 @@ static int rbtn_add(struct acpi_device *device)
                break;
        default:
                ret = -EINVAL;
+               break;
        }
+       if (ret)
+               rbtn_acquire(device, false);
 
        return ret;
-
 }
 
 static void rbtn_remove(struct acpi_device *device)
@@ -442,7 +444,6 @@ static void rbtn_remove(struct acpi_device *device)
        }
 
        rbtn_acquire(device, false);
-       device->driver_data = NULL;
 }
 
 static void rbtn_notify(struct acpi_device *device, u32 event)