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hpet: Check ACPI_COMPANION() against NULL at probe time

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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
hpet driver.

Fixes: 71f0a26734 ("hpet: Convert ACPI driver to a platform one")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/4750803.LvFx2qVVIh@rafael.j.wysocki
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafael J. Wysocki
2026-05-12 18:20:09 +02:00
committed by Greg Kroah-Hartman
parent adb2d73d42
commit fa5e295234
1 changed files with 5 additions and 1 deletions
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6
drivers/char/hpet.c
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@@ -976,10 +976,14 @@ static acpi_status hpet_resources(struct acpi_resource *res, void *data)
static int hpet_acpi_probe(struct platform_device *pdev)
{
struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
struct acpi_device *device;
acpi_status result;
struct hpet_data data;
device = ACPI_COMPANION(&pdev->dev);
if (!device)
return -ENODEV;
memset(&data, 0, sizeof(data));
result =