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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 40075C4451C for ; Sat, 18 Jul 2026 03:22:32 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0CB1F10E41E; Sat, 18 Jul 2026 03:22:31 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="X6xznPjz"; dkim-atps=neutral Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id CB9C410E41E for ; Sat, 18 Jul 2026 03:22:29 +0000 (UTC) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 8D31E40BE9; Sat, 18 Jul 2026 03:22:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 266CE1F000E9; Sat, 18 Jul 2026 03:22:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784344949; bh=dwiwGKyPqy9MzIZpuFMrcKfYrPscbIfkR2JtX98D87Y=; h=From:Subject:Reply-To:To:Cc:In-Reply-To:References:Date; b=X6xznPjzFpjynbmNf7KXbUFfO47OkceLSJ7KPnHlQSqCjHhQF7o0UqKLLQHuHHwoQ VDa0A+vBTxRJYNOz6CkXjn3W5DvS3hnBBrRoKsJrdB3LVXPqmf98MenJDwkvEIzUMp zAn8dQB0ULzNGgc2d7fb2xJi/uRqzqJBVjgySfzwiX9ml8MvXuPbsP+0x7VhVjBjWa K8DERMDkvgUKyXMdfuiJapKitPbpm25ymFhZSz2gBtkuFGBWVR6MTxhcw7rUwjpeh1 BMVaz1tdpV0Axg1Slftb0bLxYfAPNBw4+wveMAugemYizAf5E5ymyMZ5aTILH4MqdQ QLa/ALWCxzL0w== From: sashiko-bot@kernel.org Subject: Re: [RFC PATCH v2 4/8] iommu/rockchip: take all DT clocks To: "Jiaxing Hu" Cc: robh@kernel.org, devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, conor+dt@kernel.org In-Reply-To: <20260718031146.3368811-5-gahing@gahingwoo.com> References: <20260718031146.3368811-1-gahing@gahingwoo.com> <20260718031146.3368811-5-gahing@gahingwoo.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Date: Sat, 18 Jul 2026 03:22:28 +0000 Message-Id: <20260718032229.266CE1F000E9@smtp.kernel.org> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: sashiko-reviews@lists.linux.dev Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Thank you for your contribution! Sashiko AI review found 1 potential issue(= s) to consider: Pre-existing issues: - [High] Resource mapping loop incorrectly indexes `iommu->bases` array, le= ading to gaps and invalid pointer dereferences -- --- Patch [4]: [RFC PATCH v2 4/8] iommu/rockchip: take all DT clocks --- commit 77bcbb4eca287b3632f08a8528235d32ff400f72 Author: Jiaxing Hu iommu/rockchip: take all DT clocks =20 rk_iommu only enabled a fixed {aclk,iface} pair. On the RK3576 NPU the MMU sits behind the CBUF/DSU gates, so writes to DTE_ADDR are silently dropped until those clocks run too (reads work, writes need more clocks). Use devm_clk_bulk_get_all() to take every clock the devicetree provides instead of a fixed pair, so a platform can list the full set it needs. Clocks stay optional for the older clock-less devicetrees. > diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iomm= u.c > index 87ae036d64145..2ac65c0c5c0b4 100644 > --- a/drivers/iommu/rockchip-iommu.c > +++ b/drivers/iommu/rockchip-iommu.c [ ... ] > @@ -1254,25 +1249,20 @@ static int rk_iommu_probe(struct platform_device = *pdev) [Severity: High] This is a pre-existing issue, but does the resource mapping loop in rk_iommu_probe() incorrectly index the iommu->bases array? If multiple memory resources are provided but one fails to map (for example, if num_res =3D 2 and mapping for index 0 fails), iommu->bases[0] holds an ERR_PTR while iommu->bases[1] holds the valid base. However, iommu->num_mmu becomes 1. Since subsequent driver loops iterate from 0 to num_mmu - 1 and unconditionally dereference iommu->bases, this would lead to a crash on iommu->bases[0]. Also, if num_res =3D=3D 0, devm_kcalloc() returns ZERO_SIZE_PTR and reading iommu->bases[0] on the error path would panic: for (i =3D 0; i < num_res; i++) { res =3D platform_get_resource(pdev, IORESOURCE_MEM, i); if (!res) continue; iommu->bases[i] =3D devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(iommu->bases[i])) continue; iommu->num_mmu++; } if (iommu->num_mmu =3D=3D 0) return PTR_ERR(iommu->bases[0]); Could we assign to iommu->bases[iommu->num_mmu] instead of iommu->bases[i] to prevent gaps in the array, and handle the num_res =3D=3D 0 error path differently? > iommu->reset_disabled =3D device_property_read_bool(dev, > "rockchip,disable-mmu-reset"); > =20 > - iommu->num_clocks =3D ARRAY_SIZE(rk_iommu_clocks); > - iommu->clocks =3D devm_kcalloc(iommu->dev, iommu->num_clocks, > - sizeof(*iommu->clocks), GFP_KERNEL); > - if (!iommu->clocks) > - return -ENOMEM; > - > - for (i =3D 0; i < iommu->num_clocks; ++i) > - iommu->clocks[i].id =3D rk_iommu_clocks[i]; > - > /* > - * iommu clocks should be present for all new devices and devicetrees > - * but there are older devicetrees without clocks out in the wild. > - * So clocks as optional for the time being. > + * Take every clock the devicetree provides. Most IOMMU instances > + * need exactly "aclk" + "iface", but e.g. the RK3576 NPU IOMMUs sit > + * behind additional gates (CBUF/DSU) whose clocks must be running > + * for register writes to land. Clocks stay optional because there > + * are older devicetrees without clocks out in the wild. > */ > - err =3D devm_clk_bulk_get(iommu->dev, iommu->num_clocks, iommu->clocks); > + err =3D devm_clk_bulk_get_all(iommu->dev, &iommu->clocks); > if (err =3D=3D -ENOENT) > iommu->num_clocks =3D 0; > - else if (err) > + else if (err < 0) > return err; > + else > + iommu->num_clocks =3D err; > =20 > err =3D clk_bulk_prepare(iommu->num_clocks, iommu->clocks); > if (err) --=20 Sashiko AI review =C2=B7 https://sashiko.dev/#/patchset/20260718031146.3368= 811-1-gahing@gahingwoo.com?part=3D4