From nobody Mon Jun 8 21:46:11 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 3B4523DD851; Tue, 26 May 2026 10:36:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779791818; cv=none; b=KCYDZtfWfWxNzBM8mk4KA5YAb5TiVXFbACDH3OE5wRVd6hX6jdiULJ6BxizM0F6bY3z8nnIShhPmy8FpKL4RYH1az6RvFI/iQ7PMA/s3AuTCsO7/BB5yiSou+vUZ5k+HbZWJV6yVZhszeTLDZm9LfnYAZEP8CJUOtxsp7S5E97w= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779791818; c=relaxed/simple; bh=iLYxHGoL9muR/yNrgELFXRs76PtdndHLpVN0ekYuB6E=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=nDnCUxQL/mLE5rw8UfCGwPIGNSjY4+c1sF55wTRj8TdOs+hOvCajvuAGNSbOA9R6GfMvjTfCYeQwkm6v54TdJeZ+bg5ZT3jq0c9nWker7i4d38ANfny8kADqxRvVMviJwv6jtVvI1m2J8gq5HeIIAMXWOhX5XJNz3GGYeD4ESIs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MUBjDPw5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MUBjDPw5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6B3ED1F000E9; Tue, 26 May 2026 10:36:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1779791816; bh=tLvcVcVxJiONQZDgxDbkVAM4VnMTie9/jbe9M/yDzTM=; h=From:To:Cc:Subject:Date; b=MUBjDPw5TOxBUqpUnCixRmAF1U/HFE4mTEUZc9PGnYUG4t4cv+f4kBO4mo37Zuz5b GlboD6KeBhq7WhpyvyT+lVZL13TO+SW1bCkbAB/uzs9GabJIL02LjZ+xac6+JEiKyZ RVnMdNO+EXzWoq/xV2AgRL4exG933i5JmdN0Fg6XPFkIJX2eVDDbDWFpaAsR1UqstY egoFTqjqX9DDT3UtoF5R0OkoDDVDPfyhqUNjyIC+GYqxFBkVlI4gfz5gj0WtI0fa3a N891nq38gcl7N6odS/4DLUx3Y1+kqHNIpDxBbpMBjYpWKhS5YJRsnK8cc6I/W6cMuE F/njRe1QBV1cA== From: Sudeep Holla To: linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Cc: Sudeep Holla , Yeoreum Yun , Nathan Chancellor Subject: [PATCH] firmware: arm_ffa: Treat missing FF-A feature on a platform as a probe miss Date: Tue, 26 May 2026 11:36:49 +0100 Message-ID: <20260526103649.5684-1-sudeep.holla@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When FF-A initialisation is driven from a platform device probe, systems that do not implement FF-A can return -EOPNOTSUPP from the early transport or version discovery paths. Driver core treats that as a matched probe failure and prints: | arm-ffa arm-ffa: probe with driver arm-ffa failed with error -95 That is noisy for a firmware interface that can be absent on otherwise valid systems. Driver core already treats -ENODEV and -ENXIO as quiet rejected matches, so translate only the early unsupported discovery cases to -ENODEV. Keep later setup failures unchanged so real FF-A initialisation problems are still reported as probe failures. Reported-by: Nathan Chancellor Closes: https://lore.kernel.org/all/20260523001148.GA1319283@ax162 Signed-off-by: Sudeep Holla Reviewed-by: Yeoreum Yun Tested-by: Nathan Chancellor --- drivers/firmware/arm_ffa/driver.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/d= river.c index 54984e1b9741..0f468362c288 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -2109,7 +2109,7 @@ static int ffa_probe(struct platform_device *pdev) =20 ret =3D ffa_transport_init(&invoke_ffa_fn); if (ret) - return ret; + return ret =3D=3D -EOPNOTSUPP ? -ENODEV : ret; =20 drv_info =3D kzalloc_obj(*drv_info); if (!drv_info) @@ -2117,8 +2117,11 @@ static int ffa_probe(struct platform_device *pdev) platform_set_drvdata(pdev, drv_info); =20 ret =3D ffa_version_check(&drv_info->version); - if (ret) + if (ret) { + if (ret =3D=3D -EOPNOTSUPP) + ret =3D -ENODEV; goto free_drv_info; + } =20 if (ffa_id_get(&drv_info->vm_id)) { pr_err("failed to obtain VM id for self\n"); --=20 2.43.0