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Re: [PATCH V3 1/1] percpu-refcount: fix reference leak during percpu-atomic transition

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  Re: [PATCH V3 1/1] percpu-refcount: fix reference leak during  percpu-atomic transition Tejun Heo <tj@kernel.org> - 2017-01-28 14:30 +0100

#1568897 — Re: [PATCH V3 1/1] percpu-refcount: fix reference leak during percpu-atomic transition

On Sat, Jan 28, 2017 at 06:42:20AM -0600, Douglas Miller wrote:
> 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().

Applied to percpu/for-4.10-fixes w/ stable cc'd.

Thanks!

-- 
tejun

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