From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mr85p00im-zteg06021501.me.com (mr85p00im-zteg06021501.me.com [17.58.23.183]) (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 B55AB1DF97F for ; Fri, 13 Dec 2024 12:37:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=17.58.23.183 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734093443; cv=none; b=oCHXJBFHy7vZM40/rFKU8/yfQgflkZ+3EQcWow8hssXR9ozb8w8AcTpz1q75UQZAnDIB5Ad7pEvY6ug49GoAwasydHnHMiqUvASYTQSTutlsFw3DZ4NU7STABslcq6BYg2SzvbjObPNGrXnX5bF4bTQav6Vy1dJHXCd4Ukn/st8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734093443; c=relaxed/simple; bh=1aC21eRgtrQHuWt0TGHkjui+aELtSLGyaY7ee9ihTqI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=NXBSoH1lPI1hE9BLKaIE/EPBWUaHX/4B2SqtaIntqsd6ic72or/oxbwzH0Qr0V842aYILYiaHYspEwRbCQvhCxBCr9BtP7+eys52WvDMu1MMbnwBLyzu5AaDSDWJIOy6cwgd3BpBHLw9cMempMIXgTnhJoWtqBkz0Cc50/47As4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com; spf=pass smtp.mailfrom=icloud.com; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b=fCcdkbyJ; arc=none smtp.client-ip=17.58.23.183 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=icloud.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b="fCcdkbyJ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=icloud.com; s=1a1hai; t=1734093441; bh=eoBflErfJ5YHnH9CNE+FKU4F+Kpr2DDHXom6su6dnH0=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To: x-icloud-hme; b=fCcdkbyJSEtCGwzS72wGRUBVZHDv9Og+2KBDCZ1BIh40i5JINYTGuRivbJ06ZGhzm ZN4S5QkfGcca85vpkr5ix6SMgEFfCZbgqC+RE1V/HRR566EdbHYNZL8W7TdtfYR+Mg Xq6vfkQkUBWwZN8xSdKIZ0LdZvbfm8jL76LCC2K2nBnbjHao6M22l94ozhvL1kcTML T56jv3JV9iFl1jvpi+mI7gHB8huwZXa9FNHiDeaQ8CXyfqruRvdzwRolgXNrqyoYEb xPIKsThxn0SzZM4097WG6Ss+dXtpJ+m11Un/babxcE61QFrlOkkBTnA9kDFCh/FJnl B3TW3XjY6Eszw== Received: from [192.168.1.26] (mr38p00im-dlb-asmtp-mailmevip.me.com [17.57.152.18]) by mr85p00im-zteg06021501.me.com (Postfix) with ESMTPSA id 523552793D57; Fri, 13 Dec 2024 12:37:11 +0000 (UTC) From: Zijun Hu Date: Fri, 13 Dec 2024 20:36:41 +0800 Subject: [PATCH v6 1/6] phy: core: Fix that API devm_phy_put() fails to release the phy 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: 8bit Message-Id: <20241213-phy_core_fix-v6-1-40ae28f5015a@quicinc.com> References: <20241213-phy_core_fix-v6-0-40ae28f5015a@quicinc.com> In-Reply-To: <20241213-phy_core_fix-v6-0-40ae28f5015a@quicinc.com> To: Vinod Koul , Kishon Vijay Abraham I , Felipe Balbi , Greg Kroah-Hartman , Rob Herring , Arnd Bergmann , Lee Jones Cc: Greg Kroah-Hartman , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Christophe JAILLET , Johan Hovold , Zijun Hu , stable@vger.kernel.org, linux-phy@lists.infradead.org, linux-kernel@vger.kernel.org, Zijun Hu , Johan Hovold X-Mailer: b4 0.14.2 X-Proofpoint-ORIG-GUID: zx_KhUXQuellMpf8dLz_2dTS_YfoqjQg X-Proofpoint-GUID: zx_KhUXQuellMpf8dLz_2dTS_YfoqjQg X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2024-12-13_05,2024-12-12_03,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 bulkscore=0 clxscore=1015 mlxlogscore=999 adultscore=0 mlxscore=0 suspectscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2308100000 definitions=main-2412130089 X-Apple-Remote-Links: v=1;h=KCk=;charset=UTF-8 From: Zijun Hu For devm_phy_put(), its comment says it needs to invoke phy_put() to release the phy, but it will not actually invoke the function since devres_destroy() does not call devm_phy_release(), and the missing phy_put() call will cause: - The phy fails to be released. - devm_phy_put() can not fully undo what API devm_phy_get() does. - Leak refcount of both the module and device for below typical usage: devm_phy_get(); // or its variant ... err = do_something(); if (err) goto err_out; ... err_out: devm_phy_put(); // leak refcount here The file(s) affected by this issue are shown below since they have such typical usage. drivers/pci/controller/cadence/pcie-cadence.c drivers/net/ethernet/ti/am65-cpsw-nuss.c Fix by using devres_release() instead of devres_destroy() within the API. Fixes: ff764963479a ("drivers: phy: add generic PHY framework") Cc: stable@vger.kernel.org Cc: Lorenzo Pieralisi Cc: Krzysztof Wilczyński Cc: Bjorn Helgaas Cc: David S. Miller Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Reviewed-by: Johan Hovold Signed-off-by: Zijun Hu --- drivers/phy/phy-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c index f053b525ccffab1629f5e09581a6ebcc35e47f79..f190d7126613ad253b4820b9e4167dda8623439d 100644 --- a/drivers/phy/phy-core.c +++ b/drivers/phy/phy-core.c @@ -737,7 +737,7 @@ void devm_phy_put(struct device *dev, struct phy *phy) if (!phy) return; - r = devres_destroy(dev, devm_phy_release, devm_phy_match, phy); + r = devres_release(dev, devm_phy_release, devm_phy_match, phy); dev_WARN_ONCE(dev, r, "couldn't find PHY resource\n"); } EXPORT_SYMBOL_GPL(devm_phy_put); -- 2.34.1