From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- drivers/dpll/dpll_nl.c | 175 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 175 insertions(+) create mode 100644 drivers/dpll/dpll_nl.c (limited to 'drivers/dpll/dpll_nl.c') diff --git a/drivers/dpll/dpll_nl.c b/drivers/dpll/dpll_nl.c new file mode 100644 index 000000000..b1ba490e7 --- /dev/null +++ b/drivers/dpll/dpll_nl.c @@ -0,0 +1,175 @@ +// SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) +/* Do not edit directly, auto-generated from: */ +/* Documentation/netlink/specs/dpll.yaml */ +/* YNL-GEN kernel source */ +/* To regenerate run: tools/net/ynl/ynl-regen.sh */ + +#include +#include + +#include "dpll_nl.h" + +#include + +/* Common nested types */ +const struct nla_policy dpll_pin_parent_device_nl_policy[DPLL_A_PIN_OPERSTATE + 1] = { + [DPLL_A_PIN_PARENT_ID] = { .type = NLA_U32, }, + [DPLL_A_PIN_DIRECTION] = NLA_POLICY_RANGE(NLA_U32, 1, 2), + [DPLL_A_PIN_PRIO] = { .type = NLA_U32, }, + [DPLL_A_PIN_STATE] = NLA_POLICY_RANGE(NLA_U32, 1, 3), + [DPLL_A_PIN_OPERSTATE] = NLA_POLICY_RANGE(NLA_U32, 1, 4), + [DPLL_A_PIN_PHASE_OFFSET] = { .type = NLA_S64, }, + [DPLL_A_PIN_FRACTIONAL_FREQUENCY_OFFSET] = { .type = NLA_SINT, }, + [DPLL_A_PIN_FRACTIONAL_FREQUENCY_OFFSET_PPT] = { .type = NLA_SINT, }, +}; + +const struct nla_policy dpll_pin_parent_pin_nl_policy[DPLL_A_PIN_STATE + 1] = { + [DPLL_A_PIN_PARENT_ID] = { .type = NLA_U32, }, + [DPLL_A_PIN_STATE] = NLA_POLICY_RANGE(NLA_U32, 1, 3), +}; + +const struct nla_policy dpll_reference_sync_nl_policy[DPLL_A_PIN_STATE + 1] = { + [DPLL_A_PIN_ID] = { .type = NLA_U32, }, + [DPLL_A_PIN_STATE] = NLA_POLICY_RANGE(NLA_U32, 1, 3), +}; + +/* DPLL_CMD_DEVICE_ID_GET - do */ +static const struct nla_policy dpll_device_id_get_nl_policy[DPLL_A_TYPE + 1] = { + [DPLL_A_MODULE_NAME] = { .type = NLA_NUL_STRING, }, + [DPLL_A_CLOCK_ID] = { .type = NLA_U64, }, + [DPLL_A_TYPE] = NLA_POLICY_RANGE(NLA_U32, 1, 3), +}; + +/* DPLL_CMD_DEVICE_GET - do */ +static const struct nla_policy dpll_device_get_nl_policy[DPLL_A_ID + 1] = { + [DPLL_A_ID] = { .type = NLA_U32, }, +}; + +/* DPLL_CMD_DEVICE_SET - do */ +static const struct nla_policy dpll_device_set_nl_policy[DPLL_A_FREQUENCY_MONITOR + 1] = { + [DPLL_A_ID] = { .type = NLA_U32, }, + [DPLL_A_MODE] = NLA_POLICY_RANGE(NLA_U32, 1, 2), + [DPLL_A_PHASE_OFFSET_MONITOR] = NLA_POLICY_MAX(NLA_U32, 1), + [DPLL_A_PHASE_OFFSET_AVG_FACTOR] = { .type = NLA_U32, }, + [DPLL_A_FREQUENCY_MONITOR] = NLA_POLICY_MAX(NLA_U32, 1), +}; + +/* DPLL_CMD_PIN_ID_GET - do */ +static const struct nla_policy dpll_pin_id_get_nl_policy[DPLL_A_PIN_TYPE + 1] = { + [DPLL_A_PIN_MODULE_NAME] = { .type = NLA_NUL_STRING, }, + [DPLL_A_PIN_CLOCK_ID] = { .type = NLA_U64, }, + [DPLL_A_PIN_BOARD_LABEL] = { .type = NLA_NUL_STRING, }, + [DPLL_A_PIN_PANEL_LABEL] = { .type = NLA_NUL_STRING, }, + [DPLL_A_PIN_PACKAGE_LABEL] = { .type = NLA_NUL_STRING, }, + [DPLL_A_PIN_TYPE] = NLA_POLICY_RANGE(NLA_U32, 1, 6), +}; + +/* DPLL_CMD_PIN_GET - do */ +static const struct nla_policy dpll_pin_get_do_nl_policy[DPLL_A_PIN_ID + 1] = { + [DPLL_A_PIN_ID] = { .type = NLA_U32, }, +}; + +/* DPLL_CMD_PIN_GET - dump */ +static const struct nla_policy dpll_pin_get_dump_nl_policy[DPLL_A_PIN_ID + 1] = { + [DPLL_A_PIN_ID] = { .type = NLA_U32, }, +}; + +/* DPLL_CMD_PIN_SET - do */ +static const struct nla_policy dpll_pin_set_nl_policy[DPLL_A_PIN_REFERENCE_SYNC + 1] = { + [DPLL_A_PIN_ID] = { .type = NLA_U32, }, + [DPLL_A_PIN_FREQUENCY] = { .type = NLA_U64, }, + [DPLL_A_PIN_DIRECTION] = NLA_POLICY_RANGE(NLA_U32, 1, 2), + [DPLL_A_PIN_PRIO] = { .type = NLA_U32, }, + [DPLL_A_PIN_STATE] = NLA_POLICY_RANGE(NLA_U32, 1, 3), + [DPLL_A_PIN_PARENT_DEVICE] = NLA_POLICY_NESTED(dpll_pin_parent_device_nl_policy), + [DPLL_A_PIN_PARENT_PIN] = NLA_POLICY_NESTED(dpll_pin_parent_pin_nl_policy), + [DPLL_A_PIN_PHASE_ADJUST] = { .type = NLA_S32, }, + [DPLL_A_PIN_ESYNC_FREQUENCY] = { .type = NLA_U64, }, + [DPLL_A_PIN_REFERENCE_SYNC] = NLA_POLICY_NESTED(dpll_reference_sync_nl_policy), +}; + +/* Ops table for dpll */ +static const struct genl_split_ops dpll_nl_ops[] = { + { + .cmd = DPLL_CMD_DEVICE_ID_GET, + .pre_doit = dpll_lock_doit, + .doit = dpll_nl_device_id_get_doit, + .post_doit = dpll_unlock_doit, + .policy = dpll_device_id_get_nl_policy, + .maxattr = DPLL_A_TYPE, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = DPLL_CMD_DEVICE_GET, + .pre_doit = dpll_pre_doit, + .doit = dpll_nl_device_get_doit, + .post_doit = dpll_post_doit, + .policy = dpll_device_get_nl_policy, + .maxattr = DPLL_A_ID, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = DPLL_CMD_DEVICE_GET, + .dumpit = dpll_nl_device_get_dumpit, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DUMP, + }, + { + .cmd = DPLL_CMD_DEVICE_SET, + .pre_doit = dpll_pre_doit, + .doit = dpll_nl_device_set_doit, + .post_doit = dpll_post_doit, + .policy = dpll_device_set_nl_policy, + .maxattr = DPLL_A_FREQUENCY_MONITOR, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = DPLL_CMD_PIN_ID_GET, + .pre_doit = dpll_lock_doit, + .doit = dpll_nl_pin_id_get_doit, + .post_doit = dpll_unlock_doit, + .policy = dpll_pin_id_get_nl_policy, + .maxattr = DPLL_A_PIN_TYPE, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = DPLL_CMD_PIN_GET, + .pre_doit = dpll_pin_pre_doit, + .doit = dpll_nl_pin_get_doit, + .post_doit = dpll_pin_post_doit, + .policy = dpll_pin_get_do_nl_policy, + .maxattr = DPLL_A_PIN_ID, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, + { + .cmd = DPLL_CMD_PIN_GET, + .dumpit = dpll_nl_pin_get_dumpit, + .policy = dpll_pin_get_dump_nl_policy, + .maxattr = DPLL_A_PIN_ID, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DUMP, + }, + { + .cmd = DPLL_CMD_PIN_SET, + .pre_doit = dpll_pin_pre_doit, + .doit = dpll_nl_pin_set_doit, + .post_doit = dpll_pin_post_doit, + .policy = dpll_pin_set_nl_policy, + .maxattr = DPLL_A_PIN_REFERENCE_SYNC, + .flags = GENL_ADMIN_PERM | GENL_CMD_CAP_DO, + }, +}; + +static const struct genl_multicast_group dpll_nl_mcgrps[] = { + [DPLL_NLGRP_MONITOR] = { "monitor", }, +}; + +struct genl_family dpll_nl_family __ro_after_init = { + .name = DPLL_FAMILY_NAME, + .version = DPLL_FAMILY_VERSION, + .netnsok = true, + .parallel_ops = true, + .module = THIS_MODULE, + .split_ops = dpll_nl_ops, + .n_split_ops = ARRAY_SIZE(dpll_nl_ops), + .mcgrps = dpll_nl_mcgrps, + .n_mcgrps = ARRAY_SIZE(dpll_nl_mcgrps), +}; -- cgit v1.3.1