Re: [PATCH] percpu_ref: don't refer to ref->data if it isn't allocated

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To: Ming Lei <ming.lei@xxxxxxxxxx>
Subject: Re: [PATCH] percpu_ref: don't refer to ref->data if it isn't allocated
From: Jens Axboe <axboe@xxxxxxxxx>
Date: Fri, 9 Oct 2020 12:32:32 -0600
Cc: linux-block@xxxxxxxxxxxxxxx
In-reply-to: <20201009040356.43802-1-ming.lei@redhat.com>
References: <20201009040356.43802-1-ming.lei@redhat.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 10/8/20 10:03 PM, Ming Lei wrote:
> We can't check ref->data->confirm_switch directly in __percpu_ref_exit(), since
> ref->data may not be allocated in one not-initialized refcount.

Added with reported-by.

-- 
Jens Axboe

References:
- [PATCH] percpu_ref: don't refer to ref->data if it isn't allocated
  - From: Ming Lei

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