#ifndef _UAPI_RDMA_NETLINK_H #define _UAPI_RDMA_NETLINK_H #include enum { RDMA_NL_RDMA_CM = 1, RDMA_NL_IWCM, RDMA_NL_RSVD, RDMA_NL_LS, /* RDMA Local Services */ RDMA_NL_I40IW, RDMA_NL_NUM_CLIENTS }; enum { RDMA_NL_GROUP_CM = 1, RDMA_NL_GROUP_IWPM, RDMA_NL_GROUP_LS, RDMA_NL_NUM_GROUPS }; #define RDMA_NL_GET_CLIENT(type) ((type & (((1 << 6) - 1) << 10)) >> 10) #define RDMA_NL_GET_OP(type) (type & ((1 << 10) - 1)) #define RDMA_NL_GET_TYPE(client, op) ((client << 10) + op) enum { RDMA_NL_RDMA_CM_ID_STATS = 0, RDMA_NL_RDMA_CM_NUM_OPS }; enum { RDMA_NL_RDMA_CM_ATTR_SRC_ADDR = 1, RDMA_NL_RDMA_CM_ATTR_DST_ADDR, RDMA_NL_RDMA_CM_NUM_ATTR, }; /* iwarp port mapper op-codes */ enum { RDMA_NL_IWPM_REG_PID = 0, RDMA_NL_IWPM_ADD_MAPPING, RDMA_NL_IWPM_QUERY_MAPPING, RDMA_NL_IWPM_REMOVE_MAPPING, RDMA_NL_IWPM_REMOTE_INFO, RDMA_NL_IWPM_HANDLE_ERR, RDMA_NL_IWPM_MAPINFO, RDMA_NL_IWPM_MAPINFO_NUM, RDMA_NL_IWPM_NUM_OPS }; struct rdma_cm_id_stats { __u32 qp_num; __u32 bound_dev_if; __u32 port_space; __s32 pid; __u8 cm_state; __u8 node_type; __u8 port_num; __u8 qp_type; }; enum { IWPM_NLA_REG_PID_UNSPEC = 0, IWPM_NLA_REG_PID_SEQ, IWPM_NLA_REG_IF_NAME, IWPM_NLA_REG_IBDEV_NAME, IWPM_NLA_REG_ULIB_NAME, IWPM_NLA_REG_PID_MAX }; enum { IWPM_NLA_RREG_PID_UNSPEC = 0, IWPM_NLA_RREG_PID_SEQ, IWPM_NLA_RREG_IBDEV_NAME, IWPM_NLA_RREG_ULIB_NAME, IWPM_NLA_RREG_ULIB_VER, IWPM_NLA_RREG_PID_ERR, IWPM_NLA_RREG_PID_MAX }; enum { IWPM_NLA_MANAGE_MAPPING_UNSPEC = 0, IWPM_NLA_MANAGE_MAPPING_SEQ, IWPM_NLA_MANAGE_ADDR, IWPM_NLA_MANAGE_MAPPED_LOC_ADDR, IWPM_NLA_RMANAGE_MAPPING_ERR, IWPM_NLA_RMANAGE_MAPPING_MAX }; #define IWPM_NLA_MANAGE_MAPPING_MAX 3 #define IWPM_NLA_QUERY_MAPPING_MAX 4 #define IWPM_NLA_MAPINFO_SEND_MAX 3 enum { IWPM_NLA_QUERY_MAPPING_UNSPEC = 0, IWPM_NLA_QUERY_MAPPING_SEQ, IWPM_NLA_QUERY_LOCAL_ADDR, IWPM_NLA_QUERY_REMOTE_ADDR, IWPM_NLA_RQUERY_MAPPED_LOC_ADDR, IWPM_NLA_RQUERY_MAPPED_REM_ADDR, IWPM_NLA_RQUERY_MAPPING_ERR, IWPM_NLA_RQUERY_MAPPING_MAX }; enum { IWPM_NLA_MAPINFO_REQ_UNSPEC = 0, IWPM_NLA_MAPINFO_ULIB_NAME, IWPM_NLA_MAPINFO_ULIB_VER, IWPM_NLA_MAPINFO_REQ_MAX }; enum { IWPM_NLA_MAPINFO_UNSPEC = 0, IWPM_NLA_MAPINFO_LOCAL_ADDR, IWPM_NLA_MAPINFO_MAPPED_ADDR, IWPM_NLA_MAPINFO_MAX }; enum { IWPM_NLA_MAPINFO_NUM_UNSPEC = 0, IWPM_NLA_MAPINFO_SEQ, IWPM_NLA_MAPINFO_SEND_NUM, IWPM_NLA_MAPINFO_ACK_NUM, IWPM_NLA_MAPINFO_NUM_MAX }; enum { IWPM_NLA_ERR_UNSPEC = 0, IWPM_NLA_ERR_SEQ, IWPM_NLA_ERR_CODE, IWPM_NLA_ERR_MAX }; /* * Local service operations: * RESOLVE - The client requests the local service to resolve a path. * SET_TIMEOUT - The local service requests the client to set the timeout. * IP_RESOLVE - The client requests the local service to resolve an IP to GID. */ enum { RDMA_NL_LS_OP_RESOLVE = 0, RDMA_NL_LS_OP_SET_TIMEOUT, RDMA_NL_LS_OP_IP_RESOLVE, RDMA_NL_LS_NUM_OPS }; /* Local service netlink message flags */ #define RDMA_NL_LS_F_ERR 0x0100 /* Failed response */ /* * Local service resolve operation family header. * The layout for the resolve operation: * nlmsg header * family header * attributes */ /* * Local service path use: * Specify how the path(s) will be used. * ALL - For connected CM operation (6 pathrecords) * UNIDIRECTIONAL - For unidirectional UD (1 pathrecord) * GMP - For miscellaneous GMP like operation (at least 1 reversible * pathrecord) */ enum { LS_RESOLVE_PATH_USE_ALL = 0, LS_RESOLVE_PATH_USE_UNIDIRECTIONAL, LS_RESOLVE_PATH_USE_GMP, LS_RESOLVE_PATH_USE_MAX }; #define LS_DEVICE_NAME_MAX 64 struct rdma_ls_resolve_header { __u8 device_name[LS_DEVICE_NAME_MAX]; __u8 port_num; __u8 path_use; }; struct rdma_ls_ip_resolve_header { __u32 ifindex; }; /* Local service attribute type */ #define RDMA_NLA_F_MANDATORY (1 << 13) #define RDMA_NLA_TYPE_MASK (~(NLA_F_NESTED | NLA_F_NET_BYTEORDER | \ RDMA_NLA_F_MANDATORY)) /* * Local service attributes: * Attr Name Size Byte order * ----------------------------------------------------- * PATH_RECORD struct ib_path_rec_data * TIMEOUT u32 cpu * SERVICE_ID u64 cpu * DGID u8[16] BE * SGID u8[16] BE * TCLASS u8 * PKEY u16 cpu * QOS_CLASS u16 cpu * IPV4 u32 BE * IPV6 u8[16] BE */ enum { LS_NLA_TYPE_UNSPEC = 0, LS_NLA_TYPE_PATH_RECORD, LS_NLA_TYPE_TIMEOUT, LS_NLA_TYPE_SERVICE_ID, LS_NLA_TYPE_DGID, LS_NLA_TYPE_SGID, LS_NLA_TYPE_TCLASS, LS_NLA_TYPE_PKEY, LS_NLA_TYPE_QOS_CLASS, LS_NLA_TYPE_IPV4, LS_NLA_TYPE_IPV6, LS_NLA_TYPE_MAX }; /* Local service DGID/SGID attribute: big endian */ struct rdma_nla_ls_gid { __u8 gid[16]; }; #endif /* _UAPI_RDMA_NETLINK_H */
authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /sound/usb/caiaq/control.h
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_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 'sound/usb/caiaq/control.h')