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[80.71.134.83]) by smtp.gmail.com with ESMTPSA id p35-20020a056402502300b00463b9d47e1fsm4932346eda.71.2022.11.28.01.10.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 28 Nov 2022 01:10:36 -0800 (PST) From: Ricardo Ribalda Date: Mon, 28 Nov 2022 10:10:13 +0100 Subject: [PATCH v3 1/2] freezer: Add processes_frozen() MIME-Version: 1.0 Message-Id: <20221127-snd-freeze-v3-1-a2eda731ca14@chromium.org> References: <20221127-snd-freeze-v3-0-a2eda731ca14@chromium.org> In-Reply-To: <20221127-snd-freeze-v3-0-a2eda731ca14@chromium.org> To: Takashi Iwai , Len Brown , Pierre-Louis Bossart , Kai Vehmanen , Ranjani Sridharan , Mark Brown , Jaroslav Kysela , Pavel Machek , "Rafael J. Wysocki" Cc: alsa-devel@alsa-project.org, "Joel Fernandes (Google)" , Ricardo Ribalda , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org X-Mailer: b4 0.11.0-dev-696ae X-Developer-Signature: v=1; a=openpgp-sha256; l=1657; i=ribalda@chromium.org; h=from:subject:message-id; bh=4IJsRzjRUBmI8ELm76XeH219TKYxoCY1FpvtAWp9NN8=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjhHsGpUmHDy4LbKwnpR9Rk9CtwMEd0pQpdx1IE0fb 6zgFBL2JAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY4R7BgAKCRDRN9E+zzrEiO42EA CHpbt3xEX9Nc3qtOSj8Ch4ZuO/hdfkPBhyD4C5+ZvwkIovXOt2hSP+891sKUfkvG7jPbx1tB/SgbSI 6sdu+55LjjUnH2dANbcNuS79O2FpFCYNPpE7Ay2qDBZZuDb+WP27IOBVfrv7L8+ACy2tqqjELzCwnT Q/cZViMSJcGnr5llb+IkzVUz3GVqKc3UKyglcwyP+e+McJFKPsxcUUXhniivY1uTPl4I/maBS/zhbq JqBbCuNwXr6Ef3ySgmBCEYGWwuNhbray7QfkYId1aJJa/JnGQ9jQyMM8cdB23ByMOtwVXsBCFUxTUa pV2JI//mgbwcjyFitY+33Alk8p+CsZw5/sWyW7TXQTH6t0nZyRLCz3zBvQPAi2HaL1w2E+++dpVUNz a86ZD49Njb4GiF19mePCzi3LfsNW07Bz/82Y8NAvyip9oOn4tHhyg2og9wav1n+LzgJj9Fem71kBlz 75EWG3p/2TiX1aZEaHPCDEX6489tafeRTG1taPq/CgRlcPPxrOfQiOu60xgrq5jDxY7kknT/c0sR22 bZgxjhGx1MwW6PyoDItmvdmEbbPpFnuWZm1THQuvBTpjP+8H6RUt8LvdpbByM41YDFFj/J0qmtyzGX eqihKxGfFODDE3f1r8ri8YaQZECqCn/S4KZvPmGqw+WYi2FVvZ9JYmvN0cPQ== X-Developer-Key: i=ribalda@chromium.org; a=openpgp; fpr=9EC3BB66E2FC129A6F90B39556A0D81F9F782DA9 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1750730598547080667?= X-GMAIL-MSGID: =?utf-8?q?1750730598547080667?= Add a way to let the drivers know if the processes are frozen. This is needed by drivers that are waiting for processes to end on their shutdown path. Signed-off-by: Ricardo Ribalda --- include/linux/freezer.h | 2 ++ kernel/freezer.c | 11 +++++++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/freezer.h b/include/linux/freezer.h index b303472255be..ca861ace0689 100644 --- a/include/linux/freezer.h +++ b/include/linux/freezer.h @@ -47,6 +47,7 @@ extern int freeze_processes(void); extern int freeze_kernel_threads(void); extern void thaw_processes(void); extern void thaw_kernel_threads(void); +bool processes_frozen(void); static inline bool try_to_freeze(void) { @@ -80,6 +81,7 @@ static inline int freeze_processes(void) { return -ENOSYS; } static inline int freeze_kernel_threads(void) { return -ENOSYS; } static inline void thaw_processes(void) {} static inline void thaw_kernel_threads(void) {} +static inline bool processes_frozen(void) { return false; } static inline bool try_to_freeze(void) { return false; } diff --git a/kernel/freezer.c b/kernel/freezer.c index 4fad0e6fca64..08828c4e12fd 100644 --- a/kernel/freezer.c +++ b/kernel/freezer.c @@ -233,3 +233,14 @@ bool set_freezable(void) return try_to_freeze(); } EXPORT_SYMBOL(set_freezable); + +/** + * processes_frozen - Check if the processes are frozen + * + * Let drivers know if they shall wait for processes. + */ +bool processes_frozen(void) +{ + return pm_freezing; +} +EXPORT_SYMBOL(processes_frozen);