From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751910AbeBEUHD (ORCPT ); Mon, 5 Feb 2018 15:07:03 -0500 Received: from gateway30.websitewelcome.com ([192.185.149.4]:26599 "EHLO gateway30.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751853AbeBEUG4 (ORCPT ); Mon, 5 Feb 2018 15:06:56 -0500 Date: Mon, 5 Feb 2018 14:06:55 -0600 From: "Gustavo A. R. Silva" To: Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" Subject: [PATCH v2 2/8] dvb-frontends: ves1820: use 64-bit arithmetic instead of 32-bit Message-ID: <6e8742889d7c7f087e1b698409370bb5da5cd7ff.1517856716.git.gustavo@embeddedor.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 189.152.201.65 X-Source-L: No X-Exim-ID: 1ein2V-003HTV-Dk X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedgus) [189.152.201.65]:46578 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 17 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add suffix ULL to constant 10 in order to give the compiler complete information about the proper arithmetic to use. Notice that this constant is used in a context that expects an expression of type u64 (64 bits, unsigned). The expression fpxin = state->config->xin * 10 is currently being evaluated using 32-bit arithmetic. Addresses-Coverity-ID: 200604 Signed-off-by: Gustavo A. R. Silva --- Changes in v2: - Update subject and changelog to better reflect the proposed code changes. - Add suffix ULL to constant instead of casting a variable. drivers/media/dvb-frontends/ves1820.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/dvb-frontends/ves1820.c b/drivers/media/dvb-frontends/ves1820.c index 1d89792..1760098 100644 --- a/drivers/media/dvb-frontends/ves1820.c +++ b/drivers/media/dvb-frontends/ves1820.c @@ -137,7 +137,7 @@ static int ves1820_set_symbolrate(struct ves1820_state *state, u32 symbolrate) NDEC = 3; /* yeuch! */ - fpxin = state->config->xin * 10; + fpxin = state->config->xin * 10ULL; fptmp = fpxin; do_div(fptmp, 123); if (symbolrate < fptmp) SFIL = 1; -- 2.7.4