From patchwork Tue Sep 29 10:58:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 262974 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=-13.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham 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 D8298C4727F for ; Tue, 29 Sep 2020 12:29:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 939272083B for ; Tue, 29 Sep 2020 12:29:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601382565; bh=eZDc5ObhMHtmYpVYSId1z6YNr6xNx6COQw+PeGTLRM8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=z3CP5Db02jSvDJX5pG9SjaiTa13vhg4NBfcYjxvNMuMrHx3jSt2WaTQ/slFalFuZc AKPqef+MgoiB2JlPGWdWE5x23+W/asRqahiGxaJlOEITL8/joz+VvM7+17vh0cf3vd HUtj1/DnQkiOh/JNw47VQwneNIZuH6tHo2O/vJag= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732580AbgI2M3Z (ORCPT ); Tue, 29 Sep 2020 08:29:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:43018 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728780AbgI2Lbg (ORCPT ); Tue, 29 Sep 2020 07:31:36 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (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 D3C6523B09; Tue, 29 Sep 2020 11:25:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1601378701; bh=eZDc5ObhMHtmYpVYSId1z6YNr6xNx6COQw+PeGTLRM8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kxIBp6y80MaVu+VzBGO0gawwXccY+KL+qE38MpG5gkJZ+uNY8qfdUztfOfFfK+k/C mAhK7zt3tQ2+plj7SX1Kd2JPUtCfi2WHY7LgqQy+4V66gmyC2jeJTMnzBFNgQoyTRJ uLLBwrcwTjkw8RkSK0yyVvnhfrAmakLvDzyWOupU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dinh Nguyen , Stephen Boyd , Sasha Levin Subject: [PATCH 4.19 078/245] clk: stratix10: use do_div() for 64-bit calculation Date: Tue, 29 Sep 2020 12:58:49 +0200 Message-Id: <20200929105950.797035112@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200929105946.978650816@linuxfoundation.org> References: <20200929105946.978650816@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dinh Nguyen [ Upstream commit cc26ed7be46c5f5fa45f3df8161ed7ca3c4d318c ] do_div() macro to perform u64 division and guards against overflow if the result is too large for the unsigned long return type. Signed-off-by: Dinh Nguyen Link: https://lkml.kernel.org/r/20200114160726.19771-1-dinguyen@kernel.org Signed-off-by: Stephen Boyd Signed-off-by: Sasha Levin --- drivers/clk/socfpga/clk-pll-s10.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/clk/socfpga/clk-pll-s10.c b/drivers/clk/socfpga/clk-pll-s10.c index c4d0b6f6abf2e..fc2e2839fe570 100644 --- a/drivers/clk/socfpga/clk-pll-s10.c +++ b/drivers/clk/socfpga/clk-pll-s10.c @@ -38,7 +38,9 @@ static unsigned long clk_pll_recalc_rate(struct clk_hw *hwclk, /* read VCO1 reg for numerator and denominator */ reg = readl(socfpgaclk->hw.reg); refdiv = (reg & SOCFPGA_PLL_REFDIV_MASK) >> SOCFPGA_PLL_REFDIV_SHIFT; - vco_freq = (unsigned long long)parent_rate / refdiv; + + vco_freq = parent_rate; + do_div(vco_freq, refdiv); /* Read mdiv and fdiv from the fdbck register */ reg = readl(socfpgaclk->hw.reg + 0x4);