From: Bartosz Golaszewski <brgl@bgdev.pl> To: Marcel Holtmann <marcel@holtmann.org>, Luiz Augusto von Dentz <luiz.dentz@gmail.com>, "David S . Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, Kalle Valo <kvalo@kernel.org>, Bjorn Andersson <andersson@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, Bartosz Golaszewski <brgl@bgdev.pl>, Saravana Kannan <saravanak@google.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Arnd Bergmann <arnd@arndb.de>, Neil Armstrong <neil.armstrong@linaro.org>, Marek Szyprowski <m.szyprowski@samsung.com>, Alex Elder <elder@linaro.org>, Srini Kandagatla <srinivas.kandagatla@linaro.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Abel Vesa <abel.vesa@linaro.org>, Manivannan Sadhasivam <mani@kernel.org>, Lukas Wunner <lukas@wunner.de>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Cc: linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Jonathan Cameron <Jonathan.Cameron@huawei.com>, Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Subject: [PATCH v5 01/18] of: Add cleanup.h based auto release via __free(device_node) markings. Date: Fri, 16 Feb 2024 21:31:58 +0100 [thread overview] Message-ID: <20240216203215.40870-2-brgl@bgdev.pl> (raw) In-Reply-To: <20240216203215.40870-1-brgl@bgdev.pl> From: Jonathan Cameron <Jonathan.Cameron@huawei.com> The recent addition of scope based cleanup support to the kernel provides a convenient tool to reduce the chances of leaking reference counts where of_node_put() should have been called in an error path. This enables struct device_node *child __free(device_node) = NULL; for_each_child_of_node(np, child) { if (test) return test; } with no need for a manual call of of_node_put(). A following patch will reduce the scope of the child variable to the for loop, to avoid an issues with ordering of autocleanup, and make it obvious when this assigned a non NULL value. In this simple example the gains are small but there are some very complex error handling cases buried in these loops that will be greatly simplified by enabling early returns with out the need for this manual of_node_put() call. Note that there are coccinelle checks in scripts/coccinelle/iterators/for_each_child.cocci to detect a failure to call of_node_put(). This new approach does not cause false positives. Longer term we may want to add scripting to check this new approach is done correctly with no double of_node_put() calls being introduced due to the auto cleanup. It may also be useful to script finding places this new approach is useful. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> --- include/linux/of.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/of.h b/include/linux/of.h index 331e05918f11..8df240214db1 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -13,6 +13,7 @@ */ #include <linux/types.h> #include <linux/bitops.h> +#include <linux/cleanup.h> #include <linux/errno.h> #include <linux/kobject.h> #include <linux/mod_devicetable.h> @@ -134,6 +135,7 @@ static inline struct device_node *of_node_get(struct device_node *node) } static inline void of_node_put(struct device_node *node) { } #endif /* !CONFIG_OF_DYNAMIC */ +DEFINE_FREE(device_node, struct device_node *, if (_T) of_node_put(_T)) /* Pointer for first entry in chain of all nodes. */ extern struct device_node *of_root; -- 2.40.1
WARNING: multiple messages have this Message-ID (diff)
From: Bartosz Golaszewski <brgl@bgdev.pl> To: Marcel Holtmann <marcel@holtmann.org>, Luiz Augusto von Dentz <luiz.dentz@gmail.com>, "David S . Miller" <davem@davemloft.net>, Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>, Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>, Conor Dooley <conor+dt@kernel.org>, Kalle Valo <kvalo@kernel.org>, Bjorn Andersson <andersson@kernel.org>, Konrad Dybcio <konrad.dybcio@linaro.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Brown <broonie@kernel.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, Bartosz Golaszewski <brgl@bgdev.pl>, Saravana Kannan <saravanak@google.com>, Geert Uytterhoeven <geert+renesas@glider.be>, Arnd Bergmann <arnd@arndb.de>, Neil Armstrong <neil.armstrong@linaro.org>, Marek Szyprowski <m.szyprowski@samsung.com>, Alex Elder <elder@linaro.org>, Srini Kandagatla <srinivas.kandagatla@linaro.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Abel Vesa <abel.vesa@linaro.org>, Manivannan Sadhasivam <mani@kernel.org>, Lukas Wunner <lukas@wunner.de>, Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Cc: linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Jonathan Cameron <Jonathan.Cameron@huawei.com>, Bartosz Golaszewski <bartosz.golaszewski@linaro.org> Subject: [PATCH v5 01/18] of: Add cleanup.h based auto release via __free(device_node) markings. Date: Fri, 16 Feb 2024 21:31:58 +0100 [thread overview] Message-ID: <20240216203215.40870-2-brgl@bgdev.pl> (raw) In-Reply-To: <20240216203215.40870-1-brgl@bgdev.pl> From: Jonathan Cameron <Jonathan.Cameron@huawei.com> The recent addition of scope based cleanup support to the kernel provides a convenient tool to reduce the chances of leaking reference counts where of_node_put() should have been called in an error path. This enables struct device_node *child __free(device_node) = NULL; for_each_child_of_node(np, child) { if (test) return test; } with no need for a manual call of of_node_put(). A following patch will reduce the scope of the child variable to the for loop, to avoid an issues with ordering of autocleanup, and make it obvious when this assigned a non NULL value. In this simple example the gains are small but there are some very complex error handling cases buried in these loops that will be greatly simplified by enabling early returns with out the need for this manual of_node_put() call. Note that there are coccinelle checks in scripts/coccinelle/iterators/for_each_child.cocci to detect a failure to call of_node_put(). This new approach does not cause false positives. Longer term we may want to add scripting to check this new approach is done correctly with no double of_node_put() calls being introduced due to the auto cleanup. It may also be useful to script finding places this new approach is useful. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org> --- include/linux/of.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/linux/of.h b/include/linux/of.h index 331e05918f11..8df240214db1 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -13,6 +13,7 @@ */ #include <linux/types.h> #include <linux/bitops.h> +#include <linux/cleanup.h> #include <linux/errno.h> #include <linux/kobject.h> #include <linux/mod_devicetable.h> @@ -134,6 +135,7 @@ static inline struct device_node *of_node_get(struct device_node *node) } static inline void of_node_put(struct device_node *node) { } #endif /* !CONFIG_OF_DYNAMIC */ +DEFINE_FREE(device_node, struct device_node *, if (_T) of_node_put(_T)) /* Pointer for first entry in chain of all nodes. */ extern struct device_node *of_root; -- 2.40.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2024-02-16 20:33 UTC|newest] Thread overview: 159+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-02-16 20:31 [PATCH v5 00/18] power: sequencing: implement the subsystem and add first users Bartosz Golaszewski 2024-02-16 20:31 ` Bartosz Golaszewski 2024-02-16 20:31 ` Bartosz Golaszewski [this message] 2024-02-16 20:31 ` [PATCH v5 01/18] of: Add cleanup.h based auto release via __free(device_node) markings Bartosz Golaszewski 2024-02-16 20:36 ` power: sequencing: implement the subsystem and add first users bluez.test.bot 2024-02-16 20:31 ` [PATCH v5 02/18] arm64: defconfig: enable ath12k as a module Bartosz Golaszewski 2024-02-16 20:31 ` Bartosz Golaszewski 2024-02-19 7:31 ` Krzysztof Kozlowski 2024-02-19 7:31 ` Krzysztof Kozlowski 2024-02-19 7:56 ` Bartosz Golaszewski 2024-02-19 7:56 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 03/18] dt-bindings: regulator: describe the PMU module of the QCA6390 package Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-17 15:48 ` Mark Brown 2024-02-17 15:48 ` Mark Brown 2024-02-17 18:32 ` Bartosz Golaszewski 2024-02-17 18:32 ` Bartosz Golaszewski 2024-02-17 20:43 ` Mark Brown 2024-02-17 20:43 ` Mark Brown 2024-02-19 7:32 ` Krzysztof Kozlowski 2024-02-19 7:32 ` Krzysztof Kozlowski 2024-02-19 12:53 ` Bartosz Golaszewski 2024-02-19 12:53 ` Bartosz Golaszewski 2024-02-19 21:23 ` Krzysztof Kozlowski 2024-02-19 21:23 ` Krzysztof Kozlowski 2024-02-19 7:34 ` Krzysztof Kozlowski 2024-02-19 7:34 ` Krzysztof Kozlowski 2024-02-16 20:32 ` [PATCH v5 04/18] dt-bindings: net: bluetooth: qualcomm: describe regulators for QCA6390 Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-19 7:34 ` Krzysztof Kozlowski 2024-02-19 7:34 ` Krzysztof Kozlowski 2024-02-16 20:32 ` [PATCH v5 05/18] dt-bindings: new: wireless: qcom,ath11k: describe the ath11k on QCA6390 Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 06/18] dt-bindings: new: wireless: describe the ath12k PCI module Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-17 6:34 ` Kalle Valo 2024-02-17 6:34 ` Kalle Valo 2024-02-17 18:30 ` Bartosz Golaszewski 2024-02-17 18:30 ` Bartosz Golaszewski 2024-02-17 20:02 ` Jeff Johnson 2024-02-17 20:02 ` Jeff Johnson 2024-02-19 7:38 ` Krzysztof Kozlowski 2024-02-19 7:38 ` Krzysztof Kozlowski 2024-02-22 23:56 ` Rob Herring 2024-02-22 23:56 ` Rob Herring 2024-02-16 20:32 ` [PATCH v5 07/18] arm64: dts: qcom: sm8550-qrd: add the Wifi node Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 08/18] arm64: dts: qcom: sm8650-qrd: " Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 23:09 ` Dmitry Baryshkov 2024-02-16 23:09 ` Dmitry Baryshkov 2024-02-17 18:53 ` Bartosz Golaszewski 2024-02-17 18:53 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 09/18] arm64: dts: qcom: qrb5165-rb5: model the PMU of the QCA6391 Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-19 18:03 ` Mark Brown 2024-02-19 18:03 ` Mark Brown 2024-02-19 18:48 ` Bartosz Golaszewski 2024-02-19 18:48 ` Bartosz Golaszewski 2024-02-19 19:59 ` Mark Brown 2024-02-19 19:59 ` Mark Brown 2024-02-20 11:16 ` Bartosz Golaszewski 2024-02-20 11:16 ` Bartosz Golaszewski 2024-02-20 13:31 ` Mark Brown 2024-02-20 13:31 ` Mark Brown 2024-02-20 13:38 ` Bartosz Golaszewski 2024-02-20 13:38 ` Bartosz Golaszewski 2024-02-20 13:48 ` Mark Brown 2024-02-20 13:48 ` Mark Brown 2024-02-20 13:51 ` Bartosz Golaszewski 2024-02-20 13:51 ` Bartosz Golaszewski 2024-02-20 14:10 ` Mark Brown 2024-02-20 14:10 ` Mark Brown 2024-02-20 16:30 ` Dmitry Baryshkov 2024-02-20 16:30 ` Dmitry Baryshkov 2024-02-20 17:53 ` Bartosz Golaszewski 2024-02-20 17:53 ` Bartosz Golaszewski 2024-02-20 18:11 ` Dmitry Baryshkov 2024-02-20 18:11 ` Dmitry Baryshkov 2024-02-16 20:32 ` [PATCH v5 10/18] PCI: hold the rescan mutex when scanning for the first time Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 11/18] PCI/pwrctl: reuse the OF node for power controlled devices Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 12/18] PCI/pwrctl: create platform devices for child OF nodes of the port node Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 13/18] PCI/pwrctl: add PCI power control core code Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 14/18] PCI/pwrctl: add a power control driver for WCN7850 Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-18 12:25 ` kernel test robot 2024-02-19 17:49 ` Mark Brown 2024-02-19 17:49 ` Mark Brown 2024-02-20 11:22 ` Bartosz Golaszewski 2024-02-20 11:22 ` Bartosz Golaszewski 2024-02-20 12:47 ` Mark Brown 2024-02-20 12:47 ` Mark Brown 2024-02-20 21:21 ` Konrad Dybcio 2024-02-20 21:21 ` Konrad Dybcio 2024-02-20 23:44 ` Mark Brown 2024-02-20 23:44 ` Mark Brown 2024-02-22 9:22 ` Bartosz Golaszewski 2024-02-22 9:22 ` Bartosz Golaszewski 2024-02-22 12:21 ` Mark Brown 2024-02-22 12:21 ` Mark Brown 2024-02-22 12:26 ` Bartosz Golaszewski 2024-02-22 12:26 ` Bartosz Golaszewski 2024-02-22 13:15 ` Mark Brown 2024-02-22 13:15 ` Mark Brown 2024-02-22 13:26 ` Bartosz Golaszewski 2024-02-22 13:26 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 15/18] power: sequencing: implement the pwrseq core Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-18 16:26 ` kernel test robot 2024-02-16 20:32 ` [PATCH v5 16/18] power: pwrseq: add a driver for the QCA6390 PMU module Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 23:17 ` Dmitry Baryshkov 2024-02-16 23:17 ` Dmitry Baryshkov 2024-02-17 19:09 ` Bartosz Golaszewski 2024-02-17 19:09 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 17/18] Bluetooth: qca: use the power sequencer for QCA6390 Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-16 20:32 ` [PATCH v5 18/18] PCI/pwrctl: add a PCI power control driver for power sequenced devices Bartosz Golaszewski 2024-02-16 20:32 ` Bartosz Golaszewski 2024-02-18 12:53 ` [PATCH v5 00/18] power: sequencing: implement the subsystem and add first users Dmitry Baryshkov 2024-02-18 12:53 ` Dmitry Baryshkov 2024-02-19 8:14 ` Neil Armstrong 2024-02-19 8:14 ` Neil Armstrong 2024-02-19 9:22 ` Dmitry Baryshkov 2024-02-19 9:22 ` Dmitry Baryshkov 2024-02-19 9:42 ` neil.armstrong 2024-02-19 9:42 ` neil.armstrong 2024-02-19 10:26 ` Dmitry Baryshkov 2024-02-19 10:26 ` Dmitry Baryshkov 2024-02-19 12:23 ` Bartosz Golaszewski 2024-02-19 12:23 ` Bartosz Golaszewski 2024-02-19 12:33 ` Dmitry Baryshkov 2024-02-19 12:33 ` Dmitry Baryshkov 2024-02-19 17:18 ` neil.armstrong 2024-02-19 17:18 ` neil.armstrong 2024-02-19 22:21 ` Dmitry Baryshkov 2024-02-19 22:21 ` Dmitry Baryshkov 2024-02-22 11:00 ` Bartosz Golaszewski 2024-02-22 11:00 ` Bartosz Golaszewski 2024-02-22 11:26 ` Dmitry Baryshkov 2024-02-22 11:26 ` Dmitry Baryshkov 2024-02-22 12:27 ` Bartosz Golaszewski 2024-02-22 12:27 ` Bartosz Golaszewski 2024-02-22 12:47 ` Dmitry Baryshkov 2024-02-22 12:47 ` Dmitry Baryshkov 2024-02-22 12:50 ` Bartosz Golaszewski 2024-02-22 12:50 ` Bartosz Golaszewski 2024-02-22 13:46 ` neil.armstrong 2024-02-22 13:46 ` neil.armstrong 2024-02-24 8:52 ` Krzysztof Kozlowski 2024-02-24 8:52 ` Krzysztof Kozlowski 2024-02-19 8:16 ` Neil Armstrong 2024-02-19 8:16 ` Neil Armstrong 2024-03-05 12:50 ` Amit Pundir 2024-03-05 12:50 ` Amit Pundir
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