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[66.111.4.227]) by smtp.gmail.com with ESMTPSA id a10sm4472qtm.16.2021.05.03.07.47.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 May 2021 07:47:51 -0700 (PDT) Received: from compute3.internal (compute3.nyi.internal [10.202.2.43]) by mailauth.nyi.internal (Postfix) with ESMTP id 3989B27C005A; Mon, 3 May 2021 10:47:50 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute3.internal (MEProxy); Mon, 03 May 2021 10:47:50 -0400 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrvdefgedgkedvucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvufffkffojghfggfgsedtkeertdertddtnecuhfhrohhmpeeuohhquhhn ucfhvghnghcuoegsohhquhhnrdhfvghnghesghhmrghilhdrtghomheqnecuggftrfgrth htvghrnhephedvveetfefgiedutedtfeevvddvleekjeeuffffleeguefhhfejteekieeu ueelnecukfhppedufedurddutdejrddurddvheegnecuvehluhhsthgvrhfuihiivgepud enucfrrghrrghmpehmrghilhhfrhhomhepsghoqhhunhdomhgvshhmthhprghuthhhphgv rhhsohhnrghlihhthidqieelvdeghedtieegqddujeejkeehheehvddqsghoqhhunhdrfh gvnhhgpeepghhmrghilhdrtghomhesfhhigihmvgdrnhgrmhgv X-ME-Proxy: Received: from localhost (unknown [131.107.1.254]) by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 3 May 2021 10:47:49 -0400 (EDT) From: Boqun Feng To: Bjorn Helgaas , Arnd Bergmann , Marc Zyngier Cc: Russell King , Andrew Lunn , Sebastian Hesselbarth , Gregory Clement , Catalin Marinas , Will Deacon , Thomas Bogendoerfer , Lorenzo Pieralisi , Rob Herring , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Thomas Petazzoni , Boqun Feng , Mike Rapoport , Robin Murphy , Thomas Gleixner , Jon Derrick , Sunil Muthuswamy , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-pci@vger.kernel.org, linux-hyperv@vger.kernel.org Subject: [RFC v2 6/7] PCI: arm64: Allow pci_config_window::parent to be NULL Date: Mon, 3 May 2021 22:46:34 +0800 Message-Id: <20210503144635.2297386-7-boqun.feng@gmail.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210503144635.2297386-1-boqun.feng@gmail.com> References: <20210503144635.2297386-1-boqun.feng@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org This is purely a hack, for ARM64 Hyper-V guest, there is no corresponding ACPI device for the root bridge, so the best we can provide is an all-zeroed pci_config_window, and in this case make pcibios_root_bridge_prepare() act as the ACPI device is NULL. Signed-off-by: Boqun Feng --- arch/arm64/kernel/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c index e9a6eeb6a694..f159df903ccb 100644 --- a/arch/arm64/kernel/pci.c +++ b/arch/arm64/kernel/pci.c @@ -83,7 +83,7 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge) { if (!acpi_disabled) { struct pci_config_window *cfg = bridge->bus->sysdata; - struct acpi_device *adev = to_acpi_device(cfg->parent); + struct acpi_device *adev = cfg->parent ? to_acpi_device(cfg->parent) : NULL; struct device *bus_dev = &bridge->bus->dev; ACPI_COMPANION_SET(&bridge->dev, adev);