platform/x86: asus-laptop: Check ACPI_COMPANION() against NULL

Every platform driver can be forced to match a device that doesn't match
its list of device IDs because of device_match_driver_override(), so
platform drivers that rely on the existence of a device's ACPI companion
object need to verify its presence.

Accordingly, add a requisite ACPI_COMPANION() check against NULL to the
platform/x86 asus-laptop driver.

Fixes: ba19eb10170b ("platform/x86: asus-laptop: Convert ACPI driver to a platform one")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://patch.msgid.link/5083741.GXAFRqVoOG@rafael.j.wysocki
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
index dbbb6292cd11cf555a70bc2932b2a36fef084014..140ac8a105372927fbdfda1321d426998ae4839c 100644 (file)
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -1826,10 +1826,14 @@ static bool asus_device_present;
 
 static int asus_acpi_probe(struct platform_device *pdev)
 {
-       struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
+       struct acpi_device *device;
        struct asus_laptop *asus;
        int result;
 
+       device = ACPI_COMPANION(&pdev->dev);
+       if (!device)
+               return -ENODEV;
+
        pr_notice("Asus Laptop Support version %s\n",
                  ASUS_LAPTOP_VERSION);
        asus = kzalloc_obj(struct asus_laptop);