From patchwork Wed May 7 16:48:52 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Coquelin X-Patchwork-Id: 4130701 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 29CD0BFF02 for ; Wed, 7 May 2014 16:51:26 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 52EBB201FB for ; Wed, 7 May 2014 16:51:25 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7517E2013A for ; Wed, 7 May 2014 16:51:24 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wi52D-000894-K7; Wed, 07 May 2014 16:49:33 +0000 Received: from mx08-00178001.pphosted.com ([91.207.212.93]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Wi529-00081t-Ob for linux-arm-kernel@lists.infradead.org; Wed, 07 May 2014 16:49:30 +0000 Received: from pps.filterd (m0046660.ppops.net [127.0.0.1]) by mx08-00178001.pphosted.com (8.14.5/8.14.5) with SMTP id s47Gi7kQ020902; Wed, 7 May 2014 18:49:02 +0200 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 1kq7huc4nd-1 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NOT); Wed, 07 May 2014 18:49:02 +0200 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id BDEDA4E; Wed, 7 May 2014 16:48:55 +0000 (GMT) Received: from mail7.sgp.st.com (unknown [164.129.223.81]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 7325659C28; Wed, 7 May 2014 16:48:55 +0000 (GMT) Received: from lmenx29l.st.com ([10.129.6.132]) by mail7.sgp.st.com (MOS 4.3.3-GA) with ESMTP id BZG35416 (AUTH lme00137); Wed, 7 May 2014 18:48:54 +0200 From: Maxime COQUELIN To: Mike Turquette , Fabio Estevam , Shawn Guo , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH] clk: divider: Fix table round up function Date: Wed, 7 May 2014 18:48:52 +0200 Message-Id: <1399481332-9550-1-git-send-email-maxime.coquelin@st.com> X-Mailer: git-send-email 1.9.1 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.11.96, 1.0.14, 0.0.0000 definitions=2014-05-07_05:2014-05-07, 2014-05-07, 1970-01-01 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140507_094930_112545_DDD693BB X-CRM114-Status: GOOD ( 10.51 ) X-Spam-Score: -0.7 (/) Cc: maxime.coquelin@st.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Commit 1d9fe6b97 ("clk: divider: Fix best div calculation for power-of-two and table dividers") introduces a regression in its _table_round_up function. When the divider passed to this function is greater than the max divider available in the table, this function returns table's max divider. Problem is that it causes an infinite loop in clk_divider_bestdiv() because _next_div() will never return a value greater than maxdiv. Instead of returning table's max divider, this patch returns INT_MAX. Reported-by: Fabio Estevam Reported-by: Shawn Guo Tested-by: Fabio Estevam Cc: Mike Turquette Signed-off-by: Maxime Coquelin Tested-by: Shawn Guo --- drivers/clk/clk-divider.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c index b3c8396..cf9114a 100644 --- a/drivers/clk/clk-divider.c +++ b/drivers/clk/clk-divider.c @@ -158,7 +158,7 @@ static bool _is_valid_div(struct clk_divider *divider, unsigned int div) static int _round_up_table(const struct clk_div_table *table, int div) { const struct clk_div_table *clkt; - int up = _get_table_maxdiv(table); + int up = INT_MAX; for (clkt = table; clkt->div; clkt++) { if (clkt->div == div)