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 0F3E9330321; Fri, 21 Nov 2025 13:00:03 +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=1763730004; cv=none; b=rdF7UypBt5EuWabOPDUth5MPG2qdYRTZi/R0LCobC+zhm/xqKDchcqxZz4sERSgIqnXUXeTnMG2S8hcospaTxs6mwVYSLX38agU4TL+jrpgADe+p0y33gSk+Y/cEL/O5ZhLoce7N9jSqJwIeyS7EWnC+qQJq/+Lv4jW6IcuF+3M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763730004; c=relaxed/simple; bh=SdcftGZaogohxGtRzQBZunYIvvjKiTIhQ7KsQuEauxk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=KYl63J18RoxqmrkrcleS8ZSQL2LWgHAsui6a29voEDS5oEdAvh1lk2K0OfxNGKfUDnOVd1MHEFen0vDdALbtjWxVDHEq4SUsUAHOAVeSYPJb/HPRNMnwi9UynnZ/x6SRhOIB6WP0QEB54GbfUBHPmtRXG03LkYEasE8K+kDHt3U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TUChcwrL; 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="TUChcwrL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0A136C4CEF1; Fri, 21 Nov 2025 13:00:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763730003; bh=SdcftGZaogohxGtRzQBZunYIvvjKiTIhQ7KsQuEauxk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=TUChcwrLS5YCQF6MvHmkaRp2yp96+p73ZQfCVj51j2FcauKWnsRkT8g+KJXWToht7 00bgAjHUTgZNJzmPUFanLw3DGivnOGEZvxGohslYYjfL4ktoMtEv59iBm/lku8s7MS mHovPe/w0qvCX0ULTqbrky0jD1VrVPgTlYxuk/0xKuM3w6VKmgaHuKF65cW0NOOSSO FX084agFXxhXMbquwJplLz72c5K1j8iJwK52mWeJkhAUR4S2tYxQmLxUxEe5y9YJqA bziSfisNSHIK+SFSsy50s4T/B9Y3fD+IGX3J570SdpIBEuympnkJUb7M5icHAukb4Q 06iOqt5t/gzDg== Message-ID: Date: Fri, 21 Nov 2025 13:59:59 +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 , Alim Akhtar Cc: 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 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. Thanks for the patch, it's 3rd or fourth try from LKML on that, but you were the only one actually really reading the code instead of sprinking puts all around. > > 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 . Best regards, Krzysztof