platform/x86: lg-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 lg-laptop driver.

Fixes: 2d9cb20610f7 ("platform/x86: lg-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/3706551.iIbC2pHGDl@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/lg-laptop.c b/drivers/platform/x86/lg-laptop.c
index 9681412d694beda5c61b2c28b44e35ed15bb4800..a8f2f465ef3f9642f4792079afb4cea3b9d7eba8 100644 (file)
--- a/drivers/platform/x86/lg-laptop.c
+++ b/drivers/platform/x86/lg-laptop.c
@@ -761,12 +761,11 @@ static void lg_laptop_remove_address_space_handler(void *data)
 
 static int acpi_probe(struct platform_device *pdev)
 {
-       struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
        struct platform_device_info pdev_info = {
-               .fwnode = acpi_fwnode_handle(device),
                .name = PLATFORM_NAME,
                .id = PLATFORM_DEVID_NONE,
        };
+       struct acpi_device *device;
        acpi_status status;
        int ret;
        const char *product;
@@ -775,6 +774,12 @@ static int acpi_probe(struct platform_device *pdev)
        if (pf_device)
                return 0;
 
+       device = ACPI_COMPANION(&pdev->dev);
+       if (!device)
+               return -ENODEV;
+
+       pdev_info.fwnode = acpi_fwnode_handle(device),
+
        status = acpi_install_address_space_handler(device->handle, LG_ADDRESS_SPACE_ID,
                                                    &lg_laptop_address_space_handler,
                                                    NULL, &pdev->dev);