From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 C6544480968; Tue, 3 Mar 2026 15:12:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772550765; cv=none; b=AUwTr8JGF6lx+jOeYcFpG77d/jSopzdp9GvGxB9/HWN6jDcCTPai94KmLDVKAIqqwM0YvFDiOPkchQgXWyEk/pRgnFzWK4YXeptRyLbFaf/IbkwwC1HznvxN+ls85wPeP216DSD7baGtoMVO+lnwsOMRY7jn0c5zZGkXzQEe4As= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772550765; c=relaxed/simple; bh=NfU/1dTyQmXum3B0dlA8jOt7Z0DxyhbIFonMoWODsO8=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=RMemSq6mgxcp9ce2ITtbwtEh53p2M9tUB6d3R3F1Swe0VmtOOaarH7E4JpmJD8JGSnSJSLJx6MRqj1LN8u//3cy6xahOyeW0zy0MasrI0kldlnvsxMfHKpszWbWbyR9Ps0hdrk+6t7pF2U41gVzxJ5X7un6aSJiQGwofbtMpvqE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=w2VJMTJH; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="w2VJMTJH" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=NfU/1dTyQmXum3B0dlA8jOt7Z0DxyhbIFonMoWODsO8=; b=w2VJMTJH8sfOXo3GJ+xBDtAseM s538ltWvLppuQyW5CDP8ccFL5DyAztgpEu890YNuiMOmUAmUG5qiL7ZsT9Gho6Rv5YW9gFg/pFQrP CBtNMp3sH27e/WL6WRD/mefbrhSSYVVb05qrYvkOQxDCM9Ur/fmXQQWWvywk92GhXrAbvBmgcIJjl R9jbEXmXd15nHsHoEC3cmUEelxJUHh0Vwq/xI7Pipt23CXMZzRzLpsXH7Off47rfj5VrZbEgljSNX 6jgBIZE7dbl9dCGMQeNZWwgj6QdhlgPDOXjhg4mJY05LVwaUnturLY+pzZIT46GK/FehmKLUx67eQ sdmzSWdQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.98.2 #2 (Red Hat Linux)) id 1vxRQS-0000000FOlH-1dif; Tue, 03 Mar 2026 15:12:44 +0000 Date: Tue, 3 Mar 2026 07:12:44 -0800 From: Christoph Hellwig To: Chaohai Chen Cc: James.Bottomley@hansenpartnership.com, martin.petersen@oracle.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] scsi: core: Fix missing lock when read async_scan in Scsi_Host Message-ID: References: <20260302121343.1630837-1-wdhh6@aliyun.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260302121343.1630837-1-wdhh6@aliyun.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html No, using a lock to read a single scalar value makes zero sense. Just switch to READ_ONCE/WRITE_ONCE to make alpha and KCSAN happy.