Re: [PATCH] kernel: async: Fixed the wrong waitting condition of wait_event

[Andrew Morton]

(resend with cc's, sorry)

On Mon, 5 Jan 2015 11:35:35 +0800 Chunyan Zhang <chunyan.zhang@xxxxxxxxxxxxxx> wrote:

> This patch changes the waitting condition of wait_event in the
> function 'async_synchronize_cookie_domain'.
> 
> This function waits until all asynchronous function calls for the certain
> domain have been done.
> 
> But, the function 'lowest_in_progress' returns the lowest *pending*
> entry's cookie.
> 
> So we should make sure that the return value of lowest_in_progress(domain)
> must be larger than @cookie.

I'm having runtime problems with this.  Twice the kernel silently hangs
late in initcalls and the third time I got a great stream of oopses.

I'll drop it.  Hopefully you'll be able to work through the bug with
Arjan and Tejun.

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