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 --- net/mac802154/mac_cmd.c | 144 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+) create mode 100644 net/mac802154/mac_cmd.c (limited to 'net/mac802154/mac_cmd.c') diff --git a/net/mac802154/mac_cmd.c b/net/mac802154/mac_cmd.c new file mode 100644 index 000000000..8ea5b6402 --- /dev/null +++ b/net/mac802154/mac_cmd.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MAC commands interface + * + * Copyright 2007-2012 Siemens AG + * + * Written by: + * Sergey Lapin + * Dmitry Eremin-Solenikov + * Alexander Smirnov + */ + +#include +#include +#include + +#include +#include +#include + +#include "ieee802154_i.h" +#include "driver-ops.h" + +static int mac802154_mlme_start_req(struct net_device *dev, + struct ieee802154_addr *addr, + u8 channel, u8 page, + u8 bcn_ord, u8 sf_ord, + u8 pan_coord, u8 blx, + u8 coord_realign) +{ + struct ieee802154_llsec_params params; + int changed = 0; + + ASSERT_RTNL(); + + BUG_ON(addr->mode != IEEE802154_ADDR_SHORT); + + dev->ieee802154_ptr->pan_id = addr->pan_id; + dev->ieee802154_ptr->short_addr = addr->short_addr; + mac802154_dev_set_page_channel(dev, page, channel); + + params.pan_id = addr->pan_id; + changed |= IEEE802154_LLSEC_PARAM_PAN_ID; + + params.hwaddr = ieee802154_devaddr_from_raw(dev->dev_addr); + changed |= IEEE802154_LLSEC_PARAM_HWADDR; + + params.coord_hwaddr = params.hwaddr; + changed |= IEEE802154_LLSEC_PARAM_COORD_HWADDR; + + params.coord_shortaddr = addr->short_addr; + changed |= IEEE802154_LLSEC_PARAM_COORD_SHORTADDR; + + return mac802154_set_params(dev, ¶ms, changed); +} + +static int mac802154_set_mac_params(struct net_device *dev, + const struct ieee802154_mac_params *params) +{ + struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); + struct ieee802154_local *local = sdata->local; + struct wpan_dev *wpan_dev = &sdata->wpan_dev; + int ret; + + ASSERT_RTNL(); + + /* PHY */ + wpan_dev->wpan_phy->transmit_power = params->transmit_power; + wpan_dev->wpan_phy->cca = params->cca; + wpan_dev->wpan_phy->cca_ed_level = params->cca_ed_level; + + /* MAC */ + wpan_dev->min_be = params->min_be; + wpan_dev->max_be = params->max_be; + wpan_dev->csma_retries = params->csma_retries; + wpan_dev->frame_retries = params->frame_retries; + wpan_dev->lbt = params->lbt; + + if (local->hw.phy->flags & WPAN_PHY_FLAG_TXPOWER) { + ret = drv_set_tx_power(local, params->transmit_power); + if (ret < 0) + return ret; + } + + if (local->hw.phy->flags & WPAN_PHY_FLAG_CCA_MODE) { + ret = drv_set_cca_mode(local, ¶ms->cca); + if (ret < 0) + return ret; + } + + if (local->hw.phy->flags & WPAN_PHY_FLAG_CCA_ED_LEVEL) { + ret = drv_set_cca_ed_level(local, params->cca_ed_level); + if (ret < 0) + return ret; + } + + return 0; +} + +static void mac802154_get_mac_params(struct net_device *dev, + struct ieee802154_mac_params *params) +{ + struct ieee802154_sub_if_data *sdata = IEEE802154_DEV_TO_SUB_IF(dev); + struct wpan_dev *wpan_dev = &sdata->wpan_dev; + + ASSERT_RTNL(); + + /* PHY */ + params->transmit_power = wpan_dev->wpan_phy->transmit_power; + params->cca = wpan_dev->wpan_phy->cca; + params->cca_ed_level = wpan_dev->wpan_phy->cca_ed_level; + + /* MAC */ + params->min_be = wpan_dev->min_be; + params->max_be = wpan_dev->max_be; + params->csma_retries = wpan_dev->csma_retries; + params->frame_retries = wpan_dev->frame_retries; + params->lbt = wpan_dev->lbt; +} + +static const struct ieee802154_llsec_ops mac802154_llsec_ops = { + .get_params = mac802154_get_params, + .set_params = mac802154_set_params, + .add_key = mac802154_add_key, + .del_key = mac802154_del_key, + .add_dev = mac802154_add_dev, + .del_dev = mac802154_del_dev, + .add_devkey = mac802154_add_devkey, + .del_devkey = mac802154_del_devkey, + .add_seclevel = mac802154_add_seclevel, + .del_seclevel = mac802154_del_seclevel, + .lock_table = mac802154_lock_table, + .get_table = mac802154_get_table, + .unlock_table = mac802154_unlock_table, +}; + +struct ieee802154_mlme_ops mac802154_mlme_wpan = { + .start_req = mac802154_mlme_start_req, + + .llsec = &mac802154_llsec_ops, + + .set_mac_params = mac802154_set_mac_params, + .get_mac_params = mac802154_get_mac_params, +}; -- cgit v1.3.1