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UPSTREAM: Revert "bpf: Fix potential call bpf_link_free() in atomic context"

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This reverts commit 31f23a6a181c81543b10a1a9056b0e6c7ef1c747.

This change made many selftests/bpf flaky: flow_dissector, sk_lookup, sk_assign and others.
There was no issue in the code.

Change-Id: Ie5b6dd3fccd567c52aa488ca619b2a6c6313d05f
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Alexei Starovoitov 2020-09-23 19:10:38 -07:00 • committed by basamaryan
commit c7182e89c3
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GPG key ID: 210D5384FB2A5885
1 changed files with 6 additions and 2 deletions
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8
kernel/bpf/syscall.c
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@ -2342,8 +2342,12 @@ void bpf_link_put(struct bpf_link *link)
if (!atomic64_dec_and_test(&link->refcnt))
return;
INIT_WORK(&link->work, bpf_link_put_deferred);
schedule_work(&link->work);
if (in_atomic()) {
INIT_WORK(&link->work, bpf_link_put_deferred);
schedule_work(&link->work);
} else {
bpf_link_free(link);
}
}
static int bpf_link_release(struct inode *inode, struct file *filp)