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 A3D9F28505A; Tue, 12 Aug 2025 19:23:03 +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=1755026583; cv=none; b=ESTU5/ZAgiNOvWOwt/Hq166kuJzN1Kj751YlEGIb90SPcoNI9pj1objEoiGcByDZ1Q1PGo05Ouh/ajAN+8HHOfXNlc4FnTQYaFMSPmFr02rfH7qUQmAD2fqBk515qTETolSsmk70j0+I+YiHQBbCDlHKSjV1kSmOLFfhpRE/Qe8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755026583; c=relaxed/simple; bh=AtqkWmbBZMXTmpuVXE/Is1Q9WqzMo4DHS3wPjRD4gdc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=bXbvL6kVPVE1qSY5F6G6MdYeNjZrTYOWOMpYhg3EDCX5DwRpBSrj0Yo958TRqZ/tHv7Xr28FHOEVGb2dgwh7h8ZWGJyNUZb++VCK0Y/YsYUC+jrwLg5DwgxwbUpxS405AMPkniIZOUkYTiIrhcMsmBia9SZ/A9Sk5esphs42Te4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=ymoFfwZ9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="ymoFfwZ9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0FD55C4CEF0; Tue, 12 Aug 2025 19:23:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1755026583; bh=AtqkWmbBZMXTmpuVXE/Is1Q9WqzMo4DHS3wPjRD4gdc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ymoFfwZ9AYF24/BgYr4PNzXXGRBTpWg7/pImdN231I6ZrJEioyAT1hpVuAiZVsjT1 +LG6hI1BvTt0NQHz7qQciNdN+8mrU0kyzdwNuZY7+2zbnumXTxwPPXjazBWX11ugSi gETtMLGi5nx4Ak1tQaoNsCv9oa+lRB+ZO92yWqVA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Luk=C3=A1=C5=A1=20Hejtm=C3=A1nek?= , Santosh Pradhan , Trond Myklebust , Sasha Levin Subject: [PATCH 6.15 381/480] NFS: Fix wakeup of __nfs_lookup_revalidate() in unblock_revalidate() Date: Tue, 12 Aug 2025 19:49:49 +0200 Message-ID: <20250812174413.141986077@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250812174357.281828096@linuxfoundation.org> References: <20250812174357.281828096@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Trond Myklebust [ Upstream commit 1db3a48e83bb64a70bf27263b7002585574a9c2d ] Use store_release_wake_up() to add the appropriate memory barrier before calling wake_up_var(&dentry->d_fsdata). Reported-by: Lukáš Hejtmánek Suggested-by: Santosh Pradhan Link: https://lore.kernel.org/all/18945D18-3EDB-4771-B019-0335CE671077@ics.muni.cz/ Fixes: 99bc9f2eb3f7 ("NFS: add barriers when testing for NFS_FSDATA_BLOCKED") Signed-off-by: Trond Myklebust Signed-off-by: Sasha Levin --- fs/nfs/dir.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c index d0e0b435a843..d81217923936 100644 --- a/fs/nfs/dir.c +++ b/fs/nfs/dir.c @@ -1828,9 +1828,7 @@ static void block_revalidate(struct dentry *dentry) static void unblock_revalidate(struct dentry *dentry) { - /* store_release ensures wait_var_event() sees the update */ - smp_store_release(&dentry->d_fsdata, NULL); - wake_up_var(&dentry->d_fsdata); + store_release_wake_up(&dentry->d_fsdata, NULL); } /* -- 2.39.5