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[66.111.4.228]) by smtp.gmail.com with ESMTPSA id t15sm12914887iln.77.2021.08.11.08.36.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Aug 2021 08:36:39 -0700 (PDT) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailauth.nyi.internal (Postfix) with ESMTP id BCAAA27C0054; Wed, 11 Aug 2021 11:36:38 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute5.internal (MEProxy); Wed, 11 Aug 2021 11:36:38 -0400 X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvtddrkedugdeklecutefuodetggdotefrodftvf curfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfghnecu uegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmdenuc fjughrpefhvffufffkofgjfhgggfestdekredtredttdenucfhrhhomhepuehoqhhunhcu hfgvnhhguceosghoqhhunhdrfhgvnhhgsehgmhgrihhlrdgtohhmqeenucggtffrrghtth gvrhhnpeehvdevteefgfeiudettdefvedvvdelkeejueffffelgeeuhffhjeetkeeiueeu leenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmhepmhgrihhlfhhrohhmpegsoh hquhhnodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdeiledvgeehtdeigedq udejjeekheehhedvqdgsohhquhhnrdhfvghngheppehgmhgrihhlrdgtohhmsehfihigmh gvrdhnrghmvg X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 11 Aug 2021 11:36:37 -0400 (EDT) From: Boqun Feng To: Lorenzo Pieralisi Cc: Catalin Marinas , Will Deacon , Bjorn Helgaas , "Rafael J. Wysocki" , Len Brown , "K. Y. Srinivasan" , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Boqun Feng , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, linux-hyperv@vger.kernel.org, Sunil Muthuswamy , Marc Zyngier , Arnd Bergmann Subject: [RFC 3/5] PCI: hv: Set NULL as the ACPI device for the PCI host bridge Date: Wed, 11 Aug 2021 23:36:17 +0800 Message-Id: <20210811153619.88922-4-boqun.feng@gmail.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210811153619.88922-1-boqun.feng@gmail.com> References: <20210811153619.88922-1-boqun.feng@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org A PCI host bridge of Hyper-V doesn't have the corresponding ACPI device, therefore a NULL pointer needs to be set as the ->private of pci_host_bridge since for platforms with ACPI ->private is used to store the ACPI device information for the host bridges. And since kzalloc() is used to allocate pci_host_bridge, as a result, what is needed is just setting the correct size of ->private, kzalloc() will zero the field as if set a NULL pointer to it. Signed-off-by: Boqun Feng --- drivers/pci/controller/pci-hyperv.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index 62dbe98d1fe1..fd3792b5edcc 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -3021,7 +3021,12 @@ static int hv_pci_probe(struct hv_device *hdev, */ BUILD_BUG_ON(sizeof(*hbus) > HV_HYP_PAGE_SIZE); - bridge = devm_pci_alloc_host_bridge(&hdev->device, 0); + /* + * devm_pci_alloc_host_bridge() use kzalloc(), and we want to set + * ->private as a NULL pointer, therefore no need to set ->private after + * allocation. + */ + bridge = devm_pci_alloc_host_bridge(&hdev->device, sizeof(struct acpi_device *)); if (!bridge) return -ENOMEM;