From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 95CE44AC148; Tue, 15 Sep 2026 15:42:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789486974; cv=none; b=MU4Z0QWW5rAUlh+zjGdM6m1k1gwWOvoO/nNWW3GnARZa6kRK28izr0dzp1VHDKav2oWuXk4iy7qHmgXbToDyMRHBFdWCENSWWoxA7/wAXXX9p/onGjNLj5j+az6o251mykIvpGSeUuaK2zVMX1b7tCAvIF0smFKDdtN7WP5etpY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789486974; c=relaxed/simple; bh=G9rsXUEn+iYA0gFCYudDC1EwCnJ3h5Rbna4+J/7Ko8E=; h=From:Subject:To:Cc:In-Reply-To:References:Content-Type:Date: Message-Id; b=gU5TprJryEclm6G3s+RSPF27kBLC9vWneWRuE1LL/3XA7xFXTipM1GZvRZnjgq6m3Skh5Pwukb3oTRlo3I64wniQdQBrxxxX1saOR3tjXFHe6QffrN6pcQnSF6HtU2IB5BnwCXvuZS2ZxK6Mqi+SS+dBjl0rzZms3hdTkuh2RMg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gTytRoDV; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gTytRoDV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C34F1F000FF; Tue, 15 Sep 2026 15:42:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789486972; bh=ccSY9K9uxYM1oSI+gBiTsIbZc/U86mLwcFMnuY4QCwg=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=gTytRoDVAFEtRuf5n1yWftyVuhg/Eh1T9+kAOIFDBGYIsZ0he7wduUL1I8eA18Cwx q52H3R4CaLFXrkOMA0lUa6s1CeW4KCScCBz0m5TVwaVIrSedWT7SmmyH4WywBtlPX+ pmhyaFiExWZhVz0AGltnLBNYoIZnSmbSkqEhtEDOWQZhFOWcl7QSOyacNpqoHKchKF dS6izIBSKzk8WdG2tzqOLWt2mMXEpOxgy4W5JGmW/jYRUIj7HqGDp6TItzCDpsCh2m X6tTCywXIVNG5nvMLJvZjvCMl84WE8nftEbKMBt1JcebwiCF+FSF5xm8KW93Jj42Ku CuISanhpZV1ZA== From: sashiko-bot@kernel.org Subject: Re: [PATCH v4 16/20] phy: Add common Innosilicon HDMI PHY helpers Reply-To: sashiko-reviews@lists.linux.dev To: "Michal Wilczynski" Cc: linux-clk@vger.kernel.org, mfd@lists.linux.dev, linux-phy@lists.infradead.org, lee@kernel.org, olteanv@gmail.com, robh@kernel.org, devicetree@vger.kernel.org, conor+dt@kernel.org, vkoul@kernel.org, dri-devel@lists.freedesktop.org, neil.armstrong@linaro.org In-Reply-To: <20260915-jh7110-clean-send-v4-16-f0e4fd6f2cc8@samsung.com> References: <20260915-jh7110-clean-send-v4-0-f0e4fd6f2cc8@samsung.com> <20260915-jh7110-clean-send-v4-16-f0e4fd6f2cc8@samsung.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Tue, 15 Sep 2026 15:42:51 +0000 Message-Id: <20260915154252.0C34F1F000FF@smtp.kernel.org> Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Thank you for your contribution! Sashiko AI review found 1 potential issue(= s) to consider: - [High] phy: division by zero kernel panic in recalc_rate() on register re= ad failure -- commit 543e5d00d9e079829f4ad47de05248c127f81d1c Author: Michal Wilczynski phy: Add common Innosilicon HDMI PHY helpers This commit adds a common library for the Innosilicon HDMI PHY IP, which is used by several SoCs. It extracts the pre-PLL configuration table format, lookups, and clock rate helpers into shared code. > diff --git a/drivers/phy/phy-inno-hdmi.c b/drivers/phy/phy-inno-hdmi.c > new file mode 100644 > index 0000000000000..77e745a87d22b > --- /dev/null > +++ b/drivers/phy/phy-inno-hdmi.c [ ... ] > +unsigned long > +inno_hdmi_phy_pre_pll_recalc_rate(const struct inno_hdmi_phy_pre_pll *pl= l, > + unsigned long parent_rate) > +{ > + u8 nd, no_a, no_b, no_d; > + unsigned long frac, rate; > + u64 vco, vco_rate; > + u16 nf; > + > + nd =3D inno_read(pll, INNO_PRE_PLL_DIV_1) & INNO_PRE_PLL_PRE_DIV_MASK; > + nf =3D (inno_read(pll, INNO_PRE_PLL_DIV_2) & > + INNO_PRE_PLL_FB_DIV_11_8_MASK) << 8; > + nf |=3D inno_read(pll, INNO_PRE_PLL_DIV_3); > + vco =3D parent_rate * nf; [Severity: High] This is a pre-existing issue, but does this code cause an integer overflow on 32-bit architectures? When inno_hdmi_phy_pre_pll_recalc_rate() executes, parent_rate * nf multiplies two 32-bit integers, which could silently overflow before assignment to the 64-bit vco variable. > + > + if (!(inno_read(pll, INNO_PRE_PLL_DIV_2) & > + INNO_PRE_PLL_FRAC_DIV_DISABLE)) { > + frac =3D inno_read(pll, INNO_PRE_PLL_FRAC_DIV_7_0) | > + (inno_read(pll, INNO_PRE_PLL_FRAC_DIV_15_8) << 8) | > + (inno_read(pll, INNO_PRE_PLL_FRAC_DIV_23_16) << 16); > + vco +=3D DIV_ROUND_CLOSEST(parent_rate * frac, > + BIT(INNO_FRAC_DIV_WIDTH)); [Severity: High] This isn't a bug introduced by this patch, but does parent_rate * frac also massively overflow before rounding on 32-bit systems? Since parent_rate is typically 24MHz and frac is a 24-bit divider, their product exceeds the 32-bit maximum. This causes silent truncation and leads to completely incorrect calculated VCO rates. > + } > + > + vco_rate =3D vco; > + > + if (inno_read(pll, INNO_PRE_PLL_CONTROL) & INNO_PCLK_VCO_DIV_5_MASK) { > + do_div(vco, nd * 5); [Severity: High] Can this result in a division by zero kernel panic? inno_read() returns 0 if regmap_read() fails. If nd evaluates to 0 due to an uninitialized register or a read failure, the denominator becomes 0. > + } else { > + no_a =3D inno_read(pll, INNO_PCLK_DIV_AB) & INNO_PCLK_DIV_A_MASK; > + no_b =3D FIELD_GET(INNO_PCLK_DIV_B_MASK, > + inno_read(pll, INNO_PCLK_DIV_AB)) + 2; > + no_d =3D inno_read(pll, INNO_PCLK_DIV_CD) & INNO_PCLK_DIV_D_MASK; > + > + do_div(vco, nd * (no_a =3D=3D 1 ? no_b : no_a) * no_d * 2); [Severity: High] Could this also trigger a division by zero crash? If nd, no_a, or no_d evaluates to 0 due to read failures, the denominator becomes 0. The legacy RK3228 driver guarded against no_a being 0 with an explicit check (if (!no_a) no_a =3D 1;), but it appears this protection was removed when creating this shared code. > + } > + > + rate =3D DIV_ROUND_CLOSEST((unsigned long)vco, 1000) * 1000; [ ... ] --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260915-jh7110-cle= an-send-v4-0-f0e4fd6f2cc8@samsung.com?part=3D16 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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0682EC88E7F for ; Tue, 15 Sep 2026 15:42:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Reply-To:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: References:In-Reply-To:Cc:To:Subject:From:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Tue, 15 Sep 2026 15:42:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789486972; bh=ccSY9K9uxYM1oSI+gBiTsIbZc/U86mLwcFMnuY4QCwg=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=gTytRoDVAFEtRuf5n1yWftyVuhg/Eh1T9+kAOIFDBGYIsZ0he7wduUL1I8eA18Cwx q52H3R4CaLFXrkOMA0lUa6s1CeW4KCScCBz0m5TVwaVIrSedWT7SmmyH4WywBtlPX+ pmhyaFiExWZhVz0AGltnLBNYoIZnSmbSkqEhtEDOWQZhFOWcl7QSOyacNpqoHKchKF dS6izIBSKzk8WdG2tzqOLWt2mMXEpOxgy4W5JGmW/jYRUIj7HqGDp6TItzCDpsCh2m X6tTCywXIVNG5nvMLJvZjvCMl84WE8nftEbKMBt1JcebwiCF+FSF5xm8KW93Jj42Ku CuISanhpZV1ZA== From: sashiko-bot@kernel.org Subject: Re: [PATCH v4 16/20] phy: Add common Innosilicon HDMI PHY helpers To: "Michal Wilczynski" Cc: linux-clk@vger.kernel.org, mfd@lists.linux.dev, linux-phy@lists.infradead.org, lee@kernel.org, olteanv@gmail.com, robh@kernel.org, devicetree@vger.kernel.org, conor+dt@kernel.org, vkoul@kernel.org, dri-devel@lists.freedesktop.org, neil.armstrong@linaro.org In-Reply-To: <20260915-jh7110-clean-send-v4-16-f0e4fd6f2cc8@samsung.com> References: <20260915-jh7110-clean-send-v4-0-f0e4fd6f2cc8@samsung.com> <20260915-jh7110-clean-send-v4-16-f0e4fd6f2cc8@samsung.com> Date: Tue, 15 Sep 2026 15:42:51 +0000 Message-Id: <20260915154252.0C34F1F000FF@smtp.kernel.org> X-BeenThere: linux-phy@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux Phy Mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev MIME-Version: 1.0 Content-Type: text/plain; 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