From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 13D293128B8; Tue, 12 May 2026 16:25:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778603126; cv=none; b=s6paL3Be6PkL/PyMEL27lQK+ZUHqKe3NNSGX/HP5sT2YhMs9wB9a/Jw+cwddm8ys/HbkSVfEaF3faz+fpNi9BF4V86wPK0YRTL/IS77npy2VMCjz8LhM3xk9zpKq0nEXNV0rTgorA888Ej7+oYZM0JWuhpOCj9ETUJ4Qxob1wmo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778603126; c=relaxed/simple; bh=3sq6NnFrdKT6Lxa2zu6hUHrilzo/IxR+ScNbJa7Es54=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=IF+Dd6WOX5/MZjjhcATg9SQG7og3WqoBzWpAyJO+/j7/5UVafpaLdnc0sZuLEe4VRXHf5EH71D4z62LCmy87tyvb54m70vqXpKTTsPLv8VJPc4cnLl22kPL1KD04t8luf4gRhjvAqDJvz62wrh6tB31+E6DOviTPyG28v3DbYI0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jI7o6JJI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jI7o6JJI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 979E2C2BCB0; Tue, 12 May 2026 16:25:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778603125; bh=3sq6NnFrdKT6Lxa2zu6hUHrilzo/IxR+ScNbJa7Es54=; h=From:To:Cc:Subject:Date:From; b=jI7o6JJIpvCuCLDLqekxygCerIV/8/UU3l8YG3XQvf/0iHhTe8Ta5GS5BDjznReLz I1Y0xUNibxofCGvhsHUrvcKQHY+ZNtiznOx02OfbAtI7jo/iOkUebMZ/Ns349HCQK0 5r0sZeyeLEJg9JjaAVC3hafkl5MRqygWmyHiU5UKkOerLDwmx8kIAcZhliZW3xeV7o j91bB5aKJwqwg2X2J3/X+br/dVaAmFhV7bSz5Qj6cR+SMmhvl0mKxqv0vUytmUCu08 f4Nhstqwm8kAH8TjyiboyfTN/hCth9H0HgT59cCE3njQvJZKIfB8yyy3/eITZphlgK deTcWQokHshQw== From: "Rafael J. Wysocki" To: Linux ACPI Cc: Juergen Gross , Stefano Stabellini , Oleksandr Tyshchenko , LKML , Andy Shevchenko Subject: [PATCH v1] ACPI: PAD: xen: Check ACPI_COMPANION() against NULL Date: Tue, 12 May 2026 18:25:17 +0200 Message-ID: <3427762.aeNJFYEL58@rafael.j.wysocki> Organization: Linux Kernel Development Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="UTF-8" From: "Rafael J. Wysocki" 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 --- drivers/xen/xen-acpi-pad.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- 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 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);