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R. Silva" , linux-arm-kernel@lists.infradead.org (moderated list:MEDIATEK USB3 DRD IP DRIVER), linux-mediatek@lists.infradead.org (moderated list:MEDIATEK USB3 DRD IP DRIVER), linux-kernel@vger.kernel.org (open list), linux-hardening@vger.kernel.org (open list:KERNEL HARDENING (not covered by other areas):Keyword:\b__counted_by(_le|_be)?\b) Subject: [PATCH] usb: mtu3: allocate phys with ssusb Date: Fri, 10 Apr 2026 20:57:31 -0700 Message-ID: <20260411035731.163580-1-rosenp@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Use a flexible array member to combine allocations. Allows removal of a pointless branch. A size of 0 means phys are not allocated. Add __counted_by for extra runtime analysis. Signed-off-by: Rosen Penev --- drivers/usb/mtu3/mtu3.h | 2 +- drivers/usb/mtu3/mtu3_plat.c | 18 ++++++------------ 2 files changed, 7 insertions(+), 13 deletions(-) diff --git a/drivers/usb/mtu3/mtu3.h b/drivers/usb/mtu3/mtu3.h index ba5a63669e5f..d71849388602 100644 --- a/drivers/usb/mtu3/mtu3.h +++ b/drivers/usb/mtu3/mtu3.h @@ -252,7 +252,6 @@ struct ssusb_mtk { struct mtu3 *u3d; void __iomem *mac_base; void __iomem *ippc_base; - struct phy **phys; int num_phys; int wakeup_irq; /* common power & clock */ @@ -272,6 +271,7 @@ struct ssusb_mtk { struct regmap *uwk; u32 uwk_reg_base; u32 uwk_vers; + struct phy *phys[] __counted_by(num_phys); }; =20 /** diff --git a/drivers/usb/mtu3/mtu3_plat.c b/drivers/usb/mtu3/mtu3_plat.c index cc8a864dbd63..11a919fc3d47 100644 --- a/drivers/usb/mtu3/mtu3_plat.c +++ b/drivers/usb/mtu3/mtu3_plat.c @@ -240,17 +240,6 @@ static int get_ssusb_rscs(struct platform_device *pdev= , struct ssusb_mtk *ssusb) if (ret) return ret; =20 - ssusb->num_phys =3D of_count_phandle_with_args(node, - "phys", "#phy-cells"); - if (ssusb->num_phys > 0) { - ssusb->phys =3D devm_kcalloc(dev, ssusb->num_phys, - sizeof(*ssusb->phys), GFP_KERNEL); - if (!ssusb->phys) - return -ENOMEM; - } else { - ssusb->num_phys =3D 0; - } - for (i =3D 0; i < ssusb->num_phys; i++) { ssusb->phys[i] =3D devm_of_phy_get_by_index(dev, node, i); if (IS_ERR(ssusb->phys[i])) { @@ -330,12 +319,17 @@ static int mtu3_probe(struct platform_device *pdev) struct device *dev =3D &pdev->dev; struct ssusb_mtk *ssusb; int ret =3D -ENOMEM; + int num_phys; =20 + num_phys =3D of_count_phandle_with_args(dev->of_node, + "phys", "#phy-cells"); /* all elements are set to ZERO as default value */ - ssusb =3D devm_kzalloc(dev, sizeof(*ssusb), GFP_KERNEL); + ssusb =3D devm_kzalloc(dev, struct_size(ssusb, phys, num_phys), GFP_KERNE= L); if (!ssusb) return -ENOMEM; =20 + ssusb->num_phys =3D num_phys; + ret =3D dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); if (ret) { dev_err(dev, "No suitable DMA config available\n"); --=20 2.53.0