From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6A53C433FF for ; Wed, 14 Aug 2019 17:12:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C6A4216F4 for ; Wed, 14 Aug 2019 17:12:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565802729; bh=gpA5jfY7E5xa0KgP8ng14YmiMbhoXW6uBtPbe/8/lb8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=LMhs4mFXjiDOgJgRWJypR1p+xq04ALzDh13I7qaAxLPFle6bc2EBvFOToV88ONd4Y bvWGmYqP9rAhXdIjljcsKw5vnKswv0EhXlSRUDfFiLv5axB8I+KBJDFYMU7Txj/c2F SAvdCxbFIXxhLkS/1oJ1aLiUnyzZ2A68z1gJFUfk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730525AbfHNRMI (ORCPT ); Wed, 14 Aug 2019 13:12:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:35722 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729316AbfHNRMG (ORCPT ); Wed, 14 Aug 2019 13:12:06 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 866962063F; Wed, 14 Aug 2019 17:12:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1565802726; bh=gpA5jfY7E5xa0KgP8ng14YmiMbhoXW6uBtPbe/8/lb8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mAb0QH0QgSpeTcXbgTfFuHxRti0sEB5v74xLZ5bifT9/NSikAQ8J9XmjAFoasVobv xddAeD1EAg8+PHujBef2VXFGcCmlTP4y1Z03eDx2asl5YQr3b0/igmEIsJSF2IDAm4 SiWwVW4WzBPsN4tLY1myPYuNpeComuued/RgWaPo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Will Deacon , "Peter Zijlstra (Intel)" , Linus Torvalds , Peter Hurley , Thomas Gleixner , Ingo Molnar , Sasha Levin Subject: [PATCH 4.19 67/91] tty/ldsem, locking/rwsem: Add missing ACQUIRE to read_failed sleep loop Date: Wed, 14 Aug 2019 19:01:30 +0200 Message-Id: <20190814165752.450174976@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190814165748.991235624@linuxfoundation.org> References: <20190814165748.991235624@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 952041a8639a7a3a73a2b6573cb8aa8518bc39f8 ] While reviewing rwsem down_slowpath, Will noticed ldsem had a copy of a bug we just found for rwsem. X = 0; CPU0 CPU1 rwsem_down_read() for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); X = 1; rwsem_up_write(); rwsem_mark_wake() atomic_long_add(adjustment, &sem->count); smp_store_release(&waiter->task, NULL); if (!waiter.task) break; ... } r = X; Allows 'r == 0'. Reported-by: Will Deacon Signed-off-by: Peter Zijlstra (Intel) Acked-by: Will Deacon Cc: Linus Torvalds Cc: Peter Hurley Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: 4898e640caf0 ("tty: Add timed, writer-prioritized rw semaphore") Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- drivers/tty/tty_ldsem.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/tty/tty_ldsem.c b/drivers/tty/tty_ldsem.c index b989ca26fc788..2f0372976459e 100644 --- a/drivers/tty/tty_ldsem.c +++ b/drivers/tty/tty_ldsem.c @@ -116,8 +116,7 @@ static void __ldsem_wake_readers(struct ld_semaphore *sem) list_for_each_entry_safe(waiter, next, &sem->read_wait, list) { tsk = waiter->task; - smp_mb(); - waiter->task = NULL; + smp_store_release(&waiter->task, NULL); wake_up_process(tsk); put_task_struct(tsk); } @@ -217,7 +216,7 @@ down_read_failed(struct ld_semaphore *sem, long count, long timeout) for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); - if (!waiter.task) + if (!smp_load_acquire(&waiter.task)) break; if (!timeout) break; -- 2.20.1