Re: [PATCH] blktrace: Protect q->blk_trace with RCU

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On Mon, Mar 02, 2020 at 09:19:33PM +0000, Chaitanya Kulkarni wrote:
> By any chance will the following patch be able to get rid of
> the warning ?
> 
> index 4560878f0bac..889555910555 100644
> --- a/kernel/trace/blktrace.c
> +++ b/kernel/trace/blktrace.c
> @@ -1895,9 +1895,7 @@ static ssize_t sysfs_blk_trace_attr_store(struct 
> device *dev,
>                  goto out_unlock_bdev;
>          }
> 
> -       ret = 0;
> -       if (bt == NULL)
> -               ret = blk_trace_setup_queue(q, bdev);
> +       ret = bt == NULL ? blk_trace_setup_queue(q, bdev) : 0;
> 
>          if (ret == 0) {
>                  if (attr == &dev_attr_act_mask)

That looks the same thing as what created the warning, just more
compact.

I think the right thing to do is update bt to the one allocated from a
successful blk_trace_setup_queue().



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