From patchwork Thu Feb 15 15:36:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alexis_Lothor=C3=A9_=28eBPF_Foundation=29?= X-Patchwork-Id: 773301 Received: from mslow1.mail.gandi.net (mslow1.mail.gandi.net [217.70.178.240]) (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 A0EA913340F; Thu, 15 Feb 2024 15:36:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.70.178.240 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708011408; cv=none; b=XcULDlBI9gjpIGHGHiI2UTyDbGJZ5ENVSFUdhu9RAHrvM0prp4ArqoNLSI7MwTi7XO2gaWq1Rpet4EJUFiV5Cbrs3ziuv87GpCAB69o4xsqOKDWTUJWWtlUCV0dMVI/BskSR1tehZiAR9Gcq8PuDgh3SViUd8PHIY/RfTgyoLQY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708011408; c=relaxed/simple; bh=tySSyhctcJeEq9pwA1Mg9ZwgdQxeizWcyX96KTc+4Y8=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=HsIzMdoQ53WOvKX++LqMHVgl7ltMx+sGBxmt2lcWTboXJjXlYbVNT+0up1KwYmqFS27giK551eR0ZgBlmvodtAqNrgpT6N2vbsAROtpfWE/IQuDCL+rgxkSVz7RJQVlkRo7wJsvX05ODb/wJSKnDIlCrZDEmKgroZ7JGzJgmVUk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com; spf=pass smtp.mailfrom=bootlin.com; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b=CDJn+Zj6; arc=none smtp.client-ip=217.70.178.240 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=bootlin.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bootlin.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=bootlin.com header.i=@bootlin.com header.b="CDJn+Zj6" Received: from relay9-d.mail.gandi.net (unknown [217.70.183.199]) by mslow1.mail.gandi.net (Postfix) with ESMTP id 5D992C8769; Thu, 15 Feb 2024 15:36:39 +0000 (UTC) Received: by mail.gandi.net (Postfix) with ESMTPSA id 61B34FF804; Thu, 15 Feb 2024 15:36:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1708011390; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=iYpBy2pOkbObWUArx2aSecO+YI6aKHJRe0UxQNbEakU=; b=CDJn+Zj6JNC+vwzOl7OkOaWZNiubzo69dYM2ZlpacMrYvTUPpdhSBkpnN5Jxbw36gMPJ9s 97aPZ0wgSuOeH8bglwkDO5QG4dOF84AZoKW0cqd6tl53w333SjnG02IwbBGsWNUR/wwYNA llIj8O1Tdq+oKxIi4vwPpUsFKm067gG9hT4bQzDlbJ+xAICW2fxyqpcflppdlTWesGcUQ9 cnpS2d3JkCf+ULAL2zcF3zRe7d2yUXrXdqv8hPtxuayT5kMBbiEotiNLqdpGRBrNE2/zIv pitt5sZ/9KAWUa/Q+QK8V8j9Qr+SraoMXbP19o3BrA9cn35evIfNKR70iCa8GA== From: =?utf-8?q?Alexis_Lothor=C3=A9?= Subject: [PATCH 0/4] wifi: wilc1000: fix RCU usage Date: Thu, 15 Feb 2024 16:36:17 +0100 Message-Id: <20240215-wilc_fix_rcu_usage-v1-0-f610e46c6f82@bootlin.com> Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAHEvzmUC/x2MXQqAIBAGryL7XKD289BVIiTssxaiQrGC6O4tP Q7MzEMJkZGoUw9FnJx43wRMocgv4zaj5EmYrLa1NpUpL169C3y76LPLaRQDrYafQgBsQxIeESL 803543w90WGXmZAAAAA== To: linux-wireless@vger.kernel.org Cc: Ajay Singh , Claudiu Beznea , Kalle Valo , Thomas Petazzoni , linux-kernel@vger.kernel.org, =?utf-8?q?Alexis_Lothor=C3=A9?= X-Mailer: b4 0.12.4 X-GND-Sasl: alexis.lothore@bootlin.com This small series aims to fix multiple warnings observed when enabling CONFIG_PROVE_RCU_LIST: - add missing locks to create corresponding critical read sections - fix mix between RCU and SRCU API usage While at it, since SRCU API is already in use in the driver, any fix done on RCU usage was also done with the SRCU variant of RCU API. I do not really get why we are using SRCU in this driver instead of classic RCU, as it seems to be done in any other wireless driver. My understanding is that primary SRCU use case is for compatibility with realtime kernel, which needs to be preemptible everywhere. Has the driver been really developped with this constraint in mind ? If you have more details about this, feel free to educate me. To: Cc: Ajay Singh Cc: Claudiu Beznea Cc: Kalle Valo Cc: Thomas Petazzoni Cc: Signed-off-by: Alexis Lothoré --- Ajay Singh (1): wifi: wilc1000: add missing read critical sections around vif list traversal Alexis Lothoré (3): wifi: wilc1000: split deeply nested RCU list traversal in dedicated helper wifi: wilc1000: use SRCU instead of RCU for vif list traversal wifi: wilc1000: fix declarations ordering drivers/net/wireless/microchip/wilc1000/cfg80211.c | 2 +- drivers/net/wireless/microchip/wilc1000/hif.c | 70 ++++++++++++---------- drivers/net/wireless/microchip/wilc1000/netdev.c | 51 +++++++++------- drivers/net/wireless/microchip/wilc1000/netdev.h | 6 ++ drivers/net/wireless/microchip/wilc1000/wlan.c | 2 +- 5 files changed, 75 insertions(+), 56 deletions(-) --- base-commit: f4adde5c2f875c491670bc19f6abae91ae364ed6 change-id: 20240131-wilc_fix_rcu_usage-e60ecdffee25 Best regards,