tree 4493694a4f4bf51a62d27959db8bc9d551b8cba8
parent e5547d2c5eb363bfac7632ba789ca834fa829650
author Jens Axboe <axboe@kernel.dk> 1614263855 -0700
committer Jens Axboe <axboe@kernel.dk> 1614263855 -0700

Revert "io_uring: wait potential ->release() on resurrect"

This reverts commit 88f171ab7798a1ed0b9e39867ee16f307466e870.

I ran into a case where the ref resurrect now spins, so revert
this change for now until we can further investigate why it's
broken. The bug seems to indicate spinning on the lock itself,
likely there's some ABBA deadlock involved:

[<0>] __percpu_ref_switch_mode+0x45/0x180
[<0>] percpu_ref_resurrect+0x46/0x70
[<0>] io_refs_resurrect+0x25/0xa0
[<0>] __io_uring_register+0x135/0x10c0
[<0>] __x64_sys_io_uring_register+0xc2/0x1a0
[<0>] do_syscall_64+0x42/0x110
[<0>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Signed-off-by: Jens Axboe <axboe@kernel.dk>