From nobody Mon Feb 9 09:53:50 2026 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 5262131960E; Mon, 5 Jan 2026 11:36:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767612997; cv=none; b=ZJrqKhoBBKt17qE2AzK1O3hvRKN9JM96H45oQT9TA60O4s53JWB7U852eUJe+e8Pp8nPOi9IgHJsSCP96mv6GOqbuQN6BUZAInLgJWvwr9uQOAu/k+uz6zNvgaLXnePgOjpE0X8zZs7pK2zAZEWWwVDf2ITzQm0nsmixNfn9Uhg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767612997; c=relaxed/simple; bh=YSjJ1cuIpMddaWeRdW3FNnaussg9qgd0RdT5kpyzKMs=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=SvaHTBRMz8UwPoYjf+Hsnn/4GzPActS9/mTzu7/6jkaQB9YJr2oXqHio7cft06sJu8Sqv+tyR6+IeW4e1irGf44/h/QRYolKPVI0PfpViUonEVjAisKItBUZKAgDJOc31pNCCSv5W3/h7Q8SOG14pDXhJJWN4f7z4pFn0EbPRhU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=nNf2gfQf; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="nNf2gfQf" Received: from ideasonboard.com (unknown [IPv6:2a00:6020:448c:6c00:c12b:c5c7:ad08:9cf2]) by perceval.ideasonboard.com (Postfix) with UTF8SMTPSA id 0A3B3134C; Mon, 5 Jan 2026 12:36:14 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1767612974; bh=YSjJ1cuIpMddaWeRdW3FNnaussg9qgd0RdT5kpyzKMs=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=nNf2gfQfd3I5E/HFUtI1hpplXIUhWL+IQLfZvsmsErE8M0afntffLJCmCPSMyoFke rbVAHXBtierqmhLjCA3Gi6JbcGINvZP7yszubQeJtBmFZFxkTRdCYDuKJitYW1ZLl7 2IwITeCmHFo9T18L4n7NsWsfLVB9sMx/r/Nb1SEM= From: Stefan Klug Date: Mon, 05 Jan 2026 12:35:55 +0100 Subject: [PATCH 3/4] media: dw100: Fix kernel oops with PREEMPT_RT enabled Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260105-sklug-v6-16-topic-dw100-v3-1-dev-v1-3-65af34d04fd8@ideasonboard.com> References: <20260105-sklug-v6-16-topic-dw100-v3-1-dev-v1-0-65af34d04fd8@ideasonboard.com> In-Reply-To: <20260105-sklug-v6-16-topic-dw100-v3-1-dev-v1-0-65af34d04fd8@ideasonboard.com> To: Xavier Roumegue , Mauro Carvalho Chehab , Sebastian Andrzej Siewior , Clark Williams , Steven Rostedt , Laurent Pinchart Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, Stefan Klug X-Mailer: b4 0.14.2 On kernels with PREEMPT_RT enabled, a "BUG: scheduling while atomic" kernel oops occurs inside dw100_irq_handler -> vb2_buffer_done. This is because vb2_buffer_done takes a spinlock which is not allowed within interrupt context on PREEMPT_RT. Fix that by making the irq handler threaded. The threaded interrupt handling might cause the interrupt line to be disabled a little longer than before. As the line is not shared, this has no negative side effects. Signed-off-by: Stefan Klug Reviewed-by: Nicolas Dufresne --- drivers/media/platform/nxp/dw100/dw100.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/nxp/dw100/dw100.c b/drivers/media/platf= orm/nxp/dw100/dw100.c index 8a421059a1c9b55f514a29d3c2c5a6ffb76e0a64..4f5ef70e5f4a052fb5f208e35f8= 785f9d30dc54e 100644 --- a/drivers/media/platform/nxp/dw100/dw100.c +++ b/drivers/media/platform/nxp/dw100/dw100.c @@ -1600,8 +1600,9 @@ static int dw100_probe(struct platform_device *pdev) =20 pm_runtime_put_sync(&pdev->dev); =20 - ret =3D devm_request_irq(&pdev->dev, irq, dw100_irq_handler, IRQF_ONESHOT, - dev_name(&pdev->dev), dw_dev); + ret =3D devm_request_threaded_irq(&pdev->dev, irq, NULL, + dw100_irq_handler, IRQF_ONESHOT, + dev_name(&pdev->dev), dw_dev); if (ret < 0) { dev_err(&pdev->dev, "Failed to request irq: %d\n", ret); goto err_pm; --=20 2.51.0