linux-kernel - Re: [PATCH] staging: ks7010: fix wait_for_completion_interruptible

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Message-ID: <20160725205402.GC1698@katana>
Date:	Mon, 25 Jul 2016 22:54:03 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Nicholas Mc Guire <hofrat@...dl.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: ks7010: fix
 wait_for_completion_interruptible_timeout return handling

On Mon, Jul 25, 2016 at 09:21:50PM +0200, Nicholas Mc Guire wrote:
> wait_for_completion_interruptible_timeout return 0 on timeout and 
> -ERESTARTSYS if interrupted. The check for 
> !wait_for_completion_interruptible_timeout() would report an interrupt
> as timeout. Further, while HZ/50 will work most of the time it could 

Wouldn't it interpret -ERESTARTSYS as *no timeout*?

Anyway, the plain !0 comparison for me clearly shows that
'interruptible' was more copy&pasted then really planned or supported.
If it was, it would need to cancel something. Also, 20ms is pretty hard
to cancel for a user ;) Given all that and the troubles we had with
'interruptible' in the I2C subsystem, I'd much vote for dropping
interruptible here.

> fail for HZ < 50, so this is switched to msecs_to_jiffies(20).

Rest looks good, thanks!

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