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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2026-05-12 19:25:17 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2026-05-12 20:01:37 +0300 |
| commit | b7cdd59de5ae8062d2cb0121c429a271eb70daec (patch) | |
| tree | de2cd27c2d049d76b88a7d730749a09f45ac99a0 | |
| parent | e4865a56d013e86e46ea6acea15bb6eae01898ff (diff) | |
| download | linux-b7cdd59de5ae8062d2cb0121c429a271eb70daec.tar.xz | |
ACPI: PAD: xen: 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
Xen variant of the ACPI processor aggregator device (PAD) driver.
Fixes: 112b2f978afe ("ACPI: PAD: xen: Convert to a platform driver")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Link: https://patch.msgid.link/3427762.aeNJFYEL58@rafael.j.wysocki
| -rw-r--r-- | drivers/xen/xen-acpi-pad.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/xen/xen-acpi-pad.c b/drivers/xen/xen-acpi-pad.c index 75a39862c1df..5b98e0e93807 100644 --- a/drivers/xen/xen-acpi-pad.c +++ b/drivers/xen/xen-acpi-pad.c @@ -110,9 +110,13 @@ static void acpi_pad_notify(acpi_handle handle, u32 event, static int acpi_pad_probe(struct platform_device *pdev) { - struct acpi_device *device = ACPI_COMPANION(&pdev->dev); + struct acpi_device *device; acpi_status status; + device = ACPI_COMPANION(&pdev->dev); + if (!device) + return -ENODEV; + strcpy(acpi_device_name(device), ACPI_PROCESSOR_AGGREGATOR_DEVICE_NAME); strcpy(acpi_device_class(device), ACPI_PROCESSOR_AGGREGATOR_CLASS); |