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watchdog: ni903x_wdt: Check ACPI_COMPANION() against NULL

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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
ni903x_wdt watchdog driver.

Fixes: d37ec2fbab ("watchdog: ni903x_wdt: Convert to a platform driver")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/2280455.irdbgypaU6@rafael.j.wysocki
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Rafael J. Wysocki 2026-05-12 18:22:57 +02:00 committed by Guenter Roeck
parent 2b37415618
commit 36e05e134e
1 changed files with 6 additions and 1 deletions
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7
drivers/watchdog/ni903x_wdt.c
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@ -183,9 +183,14 @@ static int ni903x_acpi_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct watchdog_device *wdd;
struct ni903x_wdt *wdt;
acpi_handle handle;
acpi_status status;
int ret;
handle = ACPI_HANDLE(dev);
if (!handle)
return -ENODEV;
wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return -ENOMEM;
@ -193,7 +198,7 @@ static int ni903x_acpi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, wdt);
wdt->dev = dev;
status = acpi_walk_resources(ACPI_HANDLE(dev), METHOD_NAME__CRS,
status = acpi_walk_resources(handle, METHOD_NAME__CRS,
ni903x_resources, wdt);
if (ACPI_FAILURE(status) || wdt->io_base == 0) {
dev_err(dev, "failed to get resources\n");