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authorYonghong Song <yhs@fb.com>2017-10-30 13:50:22 -0700
committerDavid S. Miller <davem@davemloft.net>2017-11-01 12:35:48 +0900
commit07c41a295c5f25928a7cb689fdec816bd0089fe8 (patch)
tree069bf405b725d169ce806019e0d4a612d31b456c /drivers/net/ntb_netdev.c
parentnet: sit: Update lookup to handle links set to L3 slave (diff)
downloadlinux-dev-07c41a295c5f25928a7cb689fdec816bd0089fe8.tar.xz
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bpf: avoid rcu_dereference inside bpf_event_mutex lock region
During perf event attaching/detaching bpf programs, the tp_event->prog_array change is protected by the bpf_event_mutex lock in both attaching and deteching functions. Although tp_event->prog_array is a rcu pointer, rcu_derefrence is not needed to access it since mutex lock will guarantee ordering. Verified through "make C=2" that sparse locking check still happy with the new change. Also change the label name in perf_event_{attach,detach}_bpf_prog from "out" to "unlock" to reflect the code action after the label. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ntb_netdev.c')
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