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path: root/net/ieee802154/core.h
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#ifndef __IEEE802154_CORE_H
#define __IEEE802154_CORE_H

#include <net/cfg802154.h>

struct cfg802154_registered_device {
	const struct cfg802154_ops *ops;
	struct list_head list;

	/* wpan_phy index, internal only */
	int wpan_phy_idx;

	/* also protected by devlist_mtx */
	int opencount;
	wait_queue_head_t dev_wait;

	/* protected by RTNL only */
	int num_running_ifaces;

	/* associated wpan interfaces, protected by rtnl or RCU */
	struct list_head wpan_dev_list;
	int devlist_generation, wpan_dev_id;

	/* must be last because of the way we do wpan_phy_priv(),
	 * and it should at least be aligned to NETDEV_ALIGN
	 */
	struct wpan_phy wpan_phy __aligned(NETDEV_ALIGN);
};

static inline struct cfg802154_registered_device *
wpan_phy_to_rdev(struct wpan_phy *wpan_phy)
{
	BUG_ON(!wpan_phy);
	return container_of(wpan_phy, struct cfg802154_registered_device,
			    wpan_phy);
}

extern struct list_head cfg802154_rdev_list;
extern int cfg802154_rdev_list_generation;

int cfg802154_switch_netns(struct cfg802154_registered_device *rdev,
			   struct net *net);
/* free object */
void cfg802154_dev_free(struct cfg802154_registered_device *rdev);
struct cfg802154_registered_device *
cfg802154_rdev_by_wpan_phy_idx(int wpan_phy_idx);
struct wpan_phy *wpan_phy_idx_to_wpan_phy(int wpan_phy_idx);

#endif /* __IEEE802154_CORE_H */
wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'include/sound')