From nobody Sat Feb 7 13:41:44 2026 Received: from mail-pg1-f175.google.com (mail-pg1-f175.google.com [209.85.215.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B9B6B14AD1A; Sat, 17 Aug 2024 13:25:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723901108; cv=none; b=tWY3S9uzZwxfoZB+n+42wMgGIZp8NrJQnqOMnli8ttmwMTvZFCIkdBy2MRgVkZMs1HFtdgElwsVc87d+4who838IIrv+cpG05XzBD6XaWE/EPgbDyLNudpxDvkwak/v0gzfou+SOGF7zUmHGQWGExUaxWkKJgwgqL78/f9Br350= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723901108; c=relaxed/simple; bh=kdEhp/Kg27kne0vOQ2RDduD1wKCXvRJ42Jc1+k5J+XI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=LFAxmRNgJNd5ZfKj/fuK3y4qSKeZDbw6sd/F5ALZle08UqW5NiTBrJZbFFcVLddazbZMivFNPEEwTkG5+vnvN/+1QeE6kJhTPREklH09NY8sMxa6uaea+cMHl5WRNNs/rJGzK2ObHpLgyz8a2DXSJlbQXyguN90mlu8NK715w1k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ARmVkq61; arc=none smtp.client-ip=209.85.215.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ARmVkq61" Received: by mail-pg1-f175.google.com with SMTP id 41be03b00d2f7-7c6b4222fe3so1777853a12.3; Sat, 17 Aug 2024 06:25:06 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1723901106; x=1724505906; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=lBh1jjPkZpHihQJDhRtC8nDyBpN1Y8R089uuo6Q3AtU=; b=ARmVkq61YpdGz9it2ebGXsxA69GOH58qBhc1mqX+EMgvmREYMKs3ibk/nd8dyqHBE8 Kt/jZMfTD1oeJmHZ2KFGxZ3dQyJJuBQGrAVXn10+sV32EiYnoQo+xuDDXTda8vV+Ffbe USrIP9bsCRPbrNU3ed8q+7NuMjOUyjdlNasJM1ALBn0D90ocwINm++0GkL7ZPEjuJNOq 9B4ldE1B0+KqwlH91mu+6McMxnJAHMI+SUaLzyc91L8UiZFr0RvlPAiiDGl/5DJUdNVu HH2H0dIAIxl5+HN+VdFf8kljKf46KI3ZMhr1iacespaC9m9GR9t2U/zFV1JAWHFi9+gE 4loQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1723901106; x=1724505906; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=lBh1jjPkZpHihQJDhRtC8nDyBpN1Y8R089uuo6Q3AtU=; b=pmCcJwtBz4CaJAUPVe8Kyiliq3lnh7RQ4mrhVXBr9yOwphZZY+ZQ5hLxi8/P06lvIm 5mNkBWWFkzKBzd1pGL5lw/l0Az8ZAIzGi05q1g64JUmuDiaBv6R5ud2irQ0tN8ISSVkX WlVisvnHneAKlkTv6O/SFusgq/FyGP8JM4KLeH8LzI7d074nmyMdCcTvpbUO1Lc2FLRQ q4ti5KzKQoz9KwhfGJf3qe2v5UZ0hu7YdX+TtfJvo881mLIbbl5uTJSbD4tQXYIxvGBC XeoFFHmy2jxcmeQOrJd3HwAQCHh8ypZ1lCsFMLdiV8ghIcFL3SQLJ70ouvwhELdd4Vi8 vNuw== X-Forwarded-Encrypted: i=1; AJvYcCVRja306dx7CrxFvTIVtq8V/6ywJEyFPFZY2N/rSeZSjuYbH+FyymCza1r3nTXohqHL99I45jf9t63YgFXmbNIGYqh1z88sNCL6T8j4/hC13JUTDG07SnA9RVoRi2jmBJMZeiXmRUT+ X-Gm-Message-State: AOJu0YxEjJnhwY2pEN+20eKLLJlP0XxKh2LJb1Lw03nAVQQpTGCWMdVV RUEhVb9RsibrzCA092uC8PysBKV3wEyY4qmBzIx4X6OCD+Oipt0Y X-Google-Smtp-Source: AGHT+IGSpyfCzSgGAl3qtHqgyJI3xqyFgI5keFIbe7gfV8k0xV72gjZIUiodR5TFVZoh6TN+eqQ7/Q== X-Received: by 2002:a05:6a21:318b:b0:1c2:8cc4:908f with SMTP id adf61e73a8af0-1c90505277amr6015862637.48.1723901105811; Sat, 17 Aug 2024 06:25:05 -0700 (PDT) Received: from localhost.localdomain ([187.120.159.46]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-201f031c267sm39648455ad.83.2024.08.17.06.25.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 17 Aug 2024 06:25:05 -0700 (PDT) From: Guilherme Giacomo Simoes To: scott@spiteful.org, bhelgaas@google.com, ilpo.jarvinen@linux.intel.com, wsa+renesas@sang-engineering.com, lukas@wunner.de Cc: Guilherme Giacomo Simoes , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] PCI: hotplug: check the return of hotplug bridge Date: Sat, 17 Aug 2024 10:24:51 -0300 Message-ID: <20240817132452.8731-1-trintaeoitogc@gmail.com> X-Mailer: git-send-email 2.46.0 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" In some pci drivers, when the pci bridge is added if the process return an = error, the drivers don't check this and continue your execute normally. Then, this patch change this drivers for check return of pci_hp_add_bridge(= ), and if has an error, then the drivers call goto lable , free your mutex and ret= urn the error for your caller. Signed-off-by: Guilherme Giacomo Simoes --- drivers/pci/hotplug/cpci_hotplug_pci.c | 7 +++++-- drivers/pci/hotplug/cpqphp_pci.c | 9 ++++++--- drivers/pci/hotplug/ibmphp_core.c | 8 ++++++-- drivers/pci/hotplug/pciehp_pci.c | 7 +++++-- drivers/pci/hotplug/shpchp_pci.c | 7 +++++-- drivers/pci/probe.c | 9 ++++++--- 6 files changed, 33 insertions(+), 14 deletions(-) diff --git a/drivers/pci/hotplug/cpci_hotplug_pci.c b/drivers/pci/hotplug/c= pci_hotplug_pci.c index 6c48066acb44..2d3256795eab 100644 --- a/drivers/pci/hotplug/cpci_hotplug_pci.c +++ b/drivers/pci/hotplug/cpci_hotplug_pci.c @@ -269,8 +269,11 @@ int cpci_configure_slot(struct slot *slot) parent =3D slot->dev->bus; =20 for_each_pci_bridge(dev, parent) { - if (PCI_SLOT(dev->devfn) =3D=3D PCI_SLOT(slot->devfn)) - pci_hp_add_bridge(dev); + if (PCI_SLOT(dev->devfn) =3D=3D PCI_SLOT(slot->devfn)) { + ret =3D pci_hp_add_bridge(dev); + if (ret) + goto out; + } } =20 pci_assign_unassigned_bridge_resources(parent->self); diff --git a/drivers/pci/hotplug/cpqphp_pci.c b/drivers/pci/hotplug/cpqphp_= pci.c index e9f1fb333a71..5f6ce2c6385a 100644 --- a/drivers/pci/hotplug/cpqphp_pci.c +++ b/drivers/pci/hotplug/cpqphp_pci.c @@ -70,7 +70,7 @@ static void __iomem *detect_HRT_floating_pointer(void __i= omem *begin, void __iom int cpqhp_configure_device(struct controller *ctrl, struct pci_func *func) { struct pci_bus *child; - int num; + int num, ret =3D 0; =20 pci_lock_rescan_remove(); =20 @@ -97,7 +97,10 @@ int cpqhp_configure_device(struct controller *ctrl, stru= ct pci_func *func) } =20 if (func->pci_dev->hdr_type =3D=3D PCI_HEADER_TYPE_BRIDGE) { - pci_hp_add_bridge(func->pci_dev); + ret =3D pci_hp_add_bridge(func->pci_dev); + if (ret) + goto out; + child =3D func->pci_dev->subordinate; if (child) pci_bus_add_devices(child); @@ -107,7 +110,7 @@ int cpqhp_configure_device(struct controller *ctrl, str= uct pci_func *func) =20 out: pci_unlock_rescan_remove(); - return 0; + return ret; } =20 =20 diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp= _core.c index 197997e264a2..73a593c2993b 100644 --- a/drivers/pci/hotplug/ibmphp_core.c +++ b/drivers/pci/hotplug/ibmphp_core.c @@ -663,6 +663,7 @@ static int ibm_configure_device(struct pci_func *func) int num; int flag =3D 0; /* this is to make sure we don't double scan the bus, for bridged devices primarily */ + int ret =3D 0; =20 pci_lock_rescan_remove(); =20 @@ -690,7 +691,10 @@ static int ibm_configure_device(struct pci_func *func) } } if (!(flag) && (func->dev->hdr_type =3D=3D PCI_HEADER_TYPE_BRIDGE)) { - pci_hp_add_bridge(func->dev); + ret =3D pci_hp_add_bridge(func->dev); + if (ret) + goto out; + child =3D func->dev->subordinate; if (child) pci_bus_add_devices(child); @@ -698,7 +702,7 @@ static int ibm_configure_device(struct pci_func *func) =20 out: pci_unlock_rescan_remove(); - return 0; + return ret; } =20 /******************************************************* diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_= pci.c index 65e50bee1a8c..0c4873c2ef3c 100644 --- a/drivers/pci/hotplug/pciehp_pci.c +++ b/drivers/pci/hotplug/pciehp_pci.c @@ -58,8 +58,11 @@ int pciehp_configure_device(struct controller *ctrl) goto out; } =20 - for_each_pci_bridge(dev, parent) - pci_hp_add_bridge(dev); + for_each_pci_bridge(dev, parent) { + ret =3D pci_hp_add_bridge(dev); + if (ret) + goto out; + } =20 pci_assign_unassigned_bridge_resources(bridge); pcie_bus_configure_settings(parent); diff --git a/drivers/pci/hotplug/shpchp_pci.c b/drivers/pci/hotplug/shpchp_= pci.c index 36db0c3c4ea6..7db0ce966f1d 100644 --- a/drivers/pci/hotplug/shpchp_pci.c +++ b/drivers/pci/hotplug/shpchp_pci.c @@ -48,8 +48,11 @@ int shpchp_configure_device(struct slot *p_slot) } =20 for_each_pci_bridge(dev, parent) { - if (PCI_SLOT(dev->devfn) =3D=3D p_slot->device) - pci_hp_add_bridge(dev); + if (PCI_SLOT(dev->devfn) =3D=3D p_slot->device) { + ret =3D pci_hp_add_bridge(dev); + if (ret) + goto out; + } } =20 pci_assign_unassigned_bridge_resources(bridge); diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index b14b9876c030..2418998820dc 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -3363,9 +3363,10 @@ int pci_hp_add_bridge(struct pci_dev *dev) if (!pci_find_bus(pci_domain_nr(parent), busnr)) break; } + if (busnr-- > end) { pci_err(dev, "No bus number available for hot-added bridge\n"); - return -1; + return -ENODEV; } =20 /* Scan bridges that are already configured */ @@ -3380,8 +3381,10 @@ int pci_hp_add_bridge(struct pci_dev *dev) /* Scan bridges that need to be reconfigured */ pci_scan_bridge_extend(parent, dev, busnr, available_buses, 1); =20 - if (!dev->subordinate) - return -1; + if (!dev->subordinate) { + pci_err(dev, "No dev subordinate\n"); + return -ENODEV; + } =20 return 0; } --=20 2.46.0