From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757390AbaISPiJ (ORCPT ); Fri, 19 Sep 2014 11:38:09 -0400 Received: from mail.sigma-star.at ([95.130.255.111]:14385 "EHLO mail.sigma-star.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756716AbaISPiG (ORCPT ); Fri, 19 Sep 2014 11:38:06 -0400 From: Richard Weinberger To: dedekind1@gmail.com Cc: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org, Richard Weinberger Subject: [PATCH] UBI: Fix livelock in produce_free_peb() Date: Fri, 19 Sep 2014 17:37:56 +0200 Message-Id: <1411141076-21489-1-git-send-email-richard@nod.at> X-Mailer: git-send-email 1.8.4.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The while loop in produce_free_peb() assumes that each work will produce a free PEB. This is not true. If ubi->works_count is 1 and the only scheduled work is the wear_leveling_worker() produce_free_peb() can loop forever in case nobody schedules an erase work. Fix this issue by checking in the while loop whether work is scheduled. Signed-off-by: Richard Weinberger --- drivers/mtd/ubi/wl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/ubi/wl.c b/drivers/mtd/ubi/wl.c index 0509c8a..6add739 100644 --- a/drivers/mtd/ubi/wl.c +++ b/drivers/mtd/ubi/wl.c @@ -272,7 +272,7 @@ static int produce_free_peb(struct ubi_device *ubi) { int err; - while (!ubi->free.rb_node) { + while (!ubi->free.rb_node && ubi->works_count) { spin_unlock(&ubi->wl_lock); dbg_wl("do one work synchronously"); -- 1.8.4.5