platform/x86: eeepc-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 eeepc-laptop driver.

Fixes: 079b59fd2d79 ("platform/x86: eeepc-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/3056852.e9J7NaK4W3@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/eeepc-laptop.c b/drivers/platform/x86/eeepc-laptop.c
index 02a71095920e50381406cc65d354294a20917f59..d18a80907611edd0ca3402bd0de0c4d1b97cf376 100644 (file)
--- a/drivers/platform/x86/eeepc-laptop.c
+++ b/drivers/platform/x86/eeepc-laptop.c
@@ -1363,10 +1363,14 @@ static bool eeepc_device_present;
 
 static int eeepc_acpi_probe(struct platform_device *pdev)
 {
-       struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
+       struct acpi_device *device;
        struct eeepc_laptop *eeepc;
        int result;
 
+       device = ACPI_COMPANION(&pdev->dev);
+       if (!device)
+               return -ENODEV;
+
        pr_notice(EEEPC_LAPTOP_NAME "\n");
        eeepc = kzalloc_obj(struct eeepc_laptop);
        if (!eeepc)