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 A9D99231858; Thu, 27 Nov 2025 15:55:27 +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=1764258927; cv=none; b=VYZaPb3jYiMGFvG1qabZTzGGpHiAualqlN4QXXzvhHm17N23u0QgR5TNZO6q+YvcmX9uZ+mrzLDGMl0jdp5Mm1XkPewDH0+O6BUY6EnWCBURIa0GsC7jVO7vz8XHfB4rL+NFnwb+yQJNpePpbggslX+5BPST11Cav5kHyP5GJdg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764258927; c=relaxed/simple; bh=026CBl2svWcKGnjyfDvFchJHhQK772NF32WpeHwx69Q=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=JCz6xyAvlkTqEZvWCwOEcd6vndQCYtWquy58GFBmNuckXharCf0v82FXm6idE2PqHl5n/QAH9USwjG9ioZSgPrZxVWRKXH0U4xfKfrVGEJ8Tw8Pl+DQl9ccH6yA1IrsaclRTNf5BtWvG1HhXMMZkNppJVQPschlwMpF/0Ekqiv8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=l4vdNSBQ; 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="l4vdNSBQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8C4B8C4CEF8; Thu, 27 Nov 2025 15:55:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1764258927; bh=026CBl2svWcKGnjyfDvFchJHhQK772NF32WpeHwx69Q=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=l4vdNSBQG2FYfAMjO6HlDqBSd/E7VF4j46/Nx6Ew2bgaups3nRprLTm/Z6/yZre4O i0n+G6QvQOpRJ46mZ4Bbo0+o19qQ0JA2PptZiFbYnu5wMp5pF1kPo/BgMwG6kwVO3h 0C2PXKZoUo5jqTHISqBWkb/ZziqVs0vDdiiYg8A4eo522xjCt/VS7n08gi8L/njwpU 9ps5Mbh6phb2SkFiixEQFoteJPzRsLQZkTa5rTRKOgjr80zdWkbGSgVJtmLbQ9Looe /OYYUehJxtN8NtaM2ccLIhaotj4UrwJ/NFHLzjbo812CQHmUAtJClwYYNfU3Q5g8mf qmpEwphJX9FPw== Message-ID: Date: Thu, 27 Nov 2025 16:55:23 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] soc: samsung: exynos-pmu: fix device leak on regmap lookup To: Johan Hovold Cc: Alim Akhtar , Peter Griffin , linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org References: <20251121121852.16825-1-johan@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 21/11/2025 16:03, Johan Hovold wrote: > On Fri, Nov 21, 2025 at 01:59:59PM +0100, Krzysztof Kozlowski wrote: >> On 21/11/2025 13:18, Johan Hovold wrote: >>> Make sure to drop the reference taken when looking up the PMU device and >>> its regmap. >>> >>> Note that holding a reference to a device does not prevent its regmap >>> from going away so there is no point in keeping the reference. > >>> Fixes: 0b7c6075022c ("soc: samsung: exynos-pmu: Add regmap support for SoCs that protect PMU regs") >>> Cc: stable@vger.kernel.org # 6.9 >> >> Fix is fine, but unfortunately the code in v6.9 was different and I >> believe keeping dev reference made sense there - driver was relying on >> drvdata. While the leak was there as well, it was intentional. I think >> the leak can be fixed only since commit >> 35d6b98c625867209bc47df99cf03edf4280799f . > > It makes no difference actually as holding a reference to a device does > not prevent its driver data from going away either. True, fair enough. Best regards, Krzysztof