netdev - Re: [PATCH 2/3 RFC] ath10k: wmi: match wait_for_completion

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Date:	Fri, 13 Mar 2015 07:47:45 +0100
From:	Michal Kazior <michal.kazior@...to.com>
To:	Nicholas Mc Guire <hofrat@...dl.org>
Cc:	Kalle Valo <kvalo@....qualcomm.com>,
	Network Development <netdev@...r.kernel.org>,
	linux-wireless <linux-wireless@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	"ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>
Subject: Re: [PATCH 2/3 RFC] ath10k: wmi: match wait_for_completion_timeout
 return type

On 12 March 2015 at 16:49, Nicholas Mc Guire <hofrat@...dl.org> wrote:
> Return type of wait_for_completion_timeout is unsigned long not int.
> An appropriately named unsigned long is added and the assignments fixed up.
> Rather than returning 0 (timeout) or a more or less random remaining time
> (completion success) this return 0 or 1 which also resolves the type of the
> functions being int.
>
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> ---
>
> Checking the call-sites of ath10k_wmi_wait_for_unified_ready and
> ath10k_wmi_wait_for_service_ready the positive return value (remaining
> time in jiffies) is never passed up the call-chain nor used so it is
> cleaner to treat this like a boolean success/fail only (actually the two
> functions should probably be of type bool - but that does not seem to be
> common practice in the ath10k code base)

It'd make sense to have these functions return 0 or -ETIMEDOUT. In
that case both call sites would need to be adjusted to treat "< 0" or
"!x" as an error (instead of the current "<= 0") condition and not set
-ETIMEDOUT themselves.


Michał
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