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Tue, 16 Jul 2024 21:27:59 -0700 (PDT) Received: from localhost.localdomain ([220.158.156.207]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-70b7ec7d517sm7196738b3a.127.2024.07.16.21.27.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 Jul 2024 21:27:58 -0700 (PDT) From: Manivannan Sadhasivam To: Linus Torvalds Cc: Bartosz Golaszewski , Bjorn Helgaas , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam , Bartosz Golaszewski Subject: [PATCH v2] PCI: Check for the existence of 'dev.of_node' before calling of_platform_populate() Date: Wed, 17 Jul 2024 09:57:46 +0530 Message-Id: <20240717042746.8766-1-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Commit 50b040ef3732 ("PCI/pwrctl: only call of_platform_populate() if CONFIG_OF is enabled") added the CONFIG_OF guard for the of_platform_populate() API. But it missed the fact that the CONFIG_OF platforms can also run on ACPI without devicetree (so dev.of_node will be NULL). In those cases, of_platform_populate() will fail with below error messages as seen on the Ampere Altra box: pci 000c:00:01.0: failed to populate child OF nodes (-22) pci 000c:00:02.0: failed to populate child OF nodes (-22) Fix this by checking for the existence of 'dev.of_node' before calling the of_platform_populate() API. This also warrants the removal of CONFIG_OF check, since dev_of_node() helper will return NULL if CONFIG_OF is not enabled. While at it, let's also use dev_of_node() to pass device OF node pointer to of_platform_populate(). Fixes: 50b040ef3732 ("PCI/pwrctl: only call of_platform_populate() if CONFIG_OF is enabled") Reported-by: Linus Torvalds Closes: https://lore.kernel.org/linux-arm-msm/CAHk-=wjcO_9dkNf-bNda6bzykb5ZXWtAYA97p7oDsXPHmMRi6g@mail.gmail.com Reviewed-by: Bartosz Golaszewski Signed-off-by: Manivannan Sadhasivam --- Changes in v2: * Dropped CONFIG_OF check (Linus) * Used dev_of_node() to pass np to of_platform_populate() (Bart) * Slightly modified commit message * Collected review tag drivers/pci/bus.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c index 3bab78cc68f7..55c853686051 100644 --- a/drivers/pci/bus.c +++ b/drivers/pci/bus.c @@ -350,8 +350,8 @@ void pci_bus_add_device(struct pci_dev *dev) pci_dev_assign_added(dev, true); - if (IS_ENABLED(CONFIG_OF) && pci_is_bridge(dev)) { - retval = of_platform_populate(dev->dev.of_node, NULL, NULL, + if (dev_of_node(&dev->dev) && pci_is_bridge(dev)) { + retval = of_platform_populate(dev_of_node(&dev->dev), NULL, NULL, &dev->dev); if (retval) pci_err(dev, "failed to populate child OF nodes (%d)\n",