From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from ale.deltatee.com (ale.deltatee.com [204.191.154.188]) (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 B9D42445ADD; Fri, 18 Sep 2026 18:04:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=204.191.154.188 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789754704; cv=none; b=UVOpTLG3bQd4svuXuEwEOWofFp9QNYBPAwO9ocf8uDswSwB626xXx0QlsWbpRd6U5hSUMG8Awb8TyE+dxtIcomFXpPvKzfGIhhUVnf5xJ4IpYwpThzMBZ/QhYvTeJ3feqRmlGRw586/APIg/m/57LG/8TtTgdsUWAUo65EfD1nY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789754704; c=relaxed/simple; bh=ZJB7lfKekQMzrZYARcNz7jLpPQI5qGEMlYdlrdCbdng=; h=Message-ID:Date:MIME-Version:To:Cc:References:From:In-Reply-To: Content-Type:Subject; b=CBmfjKPB/EluwTgplqLJz/HibfOTkqWEqU0zVHvnVr3CvaBVEE5fd1tAvDD6JTT26QN0Y6C/buDeBctsAmgN6AmBl524qup/sVoN/iobqEPNkovQfwUm5V0vC4rtHT4uf4Tu4GtpCCfZlOyRnYw1U58GR0gFs97sXrD5FxYUaP8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com; spf=pass smtp.mailfrom=deltatee.com; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b=F95jwPCB; arc=none smtp.client-ip=204.191.154.188 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=deltatee.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=deltatee.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=deltatee.com header.i=@deltatee.com header.b="F95jwPCB" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=deltatee.com; s=20200525; h=Subject:In-Reply-To:From:References:Cc:To: MIME-Version:Date:Message-ID:content-disposition; bh=3RVfamw1qRQMMqMg1u9s++MTOjZNVIjdzhiiMuQvBJE=; b=F95jwPCBtoEHBC4QmG5F2z8GrL 3SUWG/MfA3+T8Ko0ufF1MMrjMC08fLSeBeT4LaWbvq8Auo3pnv1pfBenbCCMKdIYtz7FlqXuxszhr WnB6pGNILTUnV2eZC+S0elA5aRcREz5HSjU4gQ1cFSlP3fGF3/mFrc/xQMcTgNDMU5POnwIy/kXF0 Xz6NG38sTSUQg6H1DwNrk360hsUMvLug0CqJRcbEQZb29pvvL/VWJEis+/vBGvoR4nYKxiMzYzksN fvLNlPaV+lVTzwCDAVE2IhkVTaigtQE3LJgu4zNiRHaA93qCu5wUNZxiOvBRrxWpJq4/dXCAOZsLa MJ9J10+w==; Received: from guinness.priv.deltatee.com ([172.16.1.162]) by ale.deltatee.com with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (Exim 4.98.2) (envelope-from ) id 1x7cxB-0000000Cr7A-0hmB; Fri, 18 Sep 2026 12:04:53 -0600 Message-ID: Date: Fri, 18 Sep 2026 12:04:49 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Koichiro Den , Jon Mason , Dave Jiang , Allen Hubbe Cc: Frank Li , fuyuanli , Greg Kroah-Hartman , Nicholas Bellinger , Joey Zhang , ntb@lists.linux.dev, linux-kernel@vger.kernel.org References: <20260910040836.3792333-1-den@valinux.co.jp> <20260910040836.3792333-12-den@valinux.co.jp> Content-Language: en-CA From: Logan Gunthorpe In-Reply-To: <20260910040836.3792333-12-den@valinux.co.jp> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 172.16.1.162 X-SA-Exim-Rcpt-To: den@valinux.co.jp, jdmason@kudzu.us, dave.jiang@intel.com, allenbh@gmail.com, Frank.Li@kernel.org, fuyuanli0722@gmail.com, gregkh@linuxfoundation.org, nab@linux-iscsi.org, joey.zhang@microchip.com, ntb@lists.linux.dev, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: logang@deltatee.com X-Spam-Level: Subject: Re: [PATCH v2 11/14] NTB: ntb_transport: Prepare remote RX info accesses for MW teardown X-SA-Exim-Version: 4.2.1 (built Sun, 23 Feb 2025 07:57:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) On 2026-09-09 22:08, Koichiro Den wrote: > The next patch clears remote_rx_info when freeing its MW. > ntb_transport_tx_free_entry() and debugfs stats reads can run during > link cleanup, so make them handle a NULL pointer. > > The pointer is accessed locklessly. Use READ_ONCE() and WRITE_ONCE() > to prevent compiler-induced tearing, and retain the read value so > the NULL check and dereference use the same pointer. > > Cc: stable@vger.kernel.org > Signed-off-by: Koichiro Den Looks good to me: Reviewed-by: Logan Gunthorpe