linux-kernel - Re: [PATCH] drm: fix fallouts from slow-work -> wq conversion

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Message-ID: <4C6009FE.4020702@gmail.com>
Date:	Mon, 09 Aug 2010 07:00:30 -0700
From:	walt <w41ter@...il.com>
To:	Tejun Heo <htejun@...il.com>
CC:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	David Airlie <airlied@...ux.ie>,
	DRI <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm: fix fallouts from slow-work -> wq conversion

On 08/09/2010 03:20 AM, Tejun Heo wrote:
>  From 9a919c46dfa48a9c1f465174609b90253eb8ffc1 Mon Sep 17 00:00:00 2001
> From: Tejun Heo<tj@...nel.org>
> Date: Mon, 9 Aug 2010 12:01:27 +0200
>
> Commit 991ea75c (drm: use workqueue instead of slow-work), which made
> drm to use wq instead of slow-work, didn't account for the return
> value difference between delayed_slow_work_enqueue() and
> queue_delayed_work().  The former returns 0 on success and -errno on
> failures while the latter never fails and only uses the return value
> to indicate whether the work was already pending or not.
>
> This misconversion triggered spurious error messages.  Remove the now
> unnecessary return value check and error message.


> diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
> index 4598130..b9e4dbf 100644
> --- a/drivers/gpu/drm/drm_crtc_helper.c
> +++ b/drivers/gpu/drm/drm_crtc_helper.c
> @@ -839,7 +839,6 @@ static void output_poll_execute(struct work_struct *work)
>   	struct drm_connector *connector;
>   	enum drm_connector_status old_status, status;
>   	bool repoll = false, changed = false;
> -	int ret;
>
>   	mutex_lock(&dev->mode_config.mutex);
>   	list_for_each_entry(connector,&dev->mode_config.connector_list, head) {
> @@ -874,11 +873,8 @@ static void output_poll_execute(struct work_struct *work)
>   			dev->mode_config.funcs->output_poll_changed(dev);
>   	}
>
> -	if (repoll) {
> -		ret = queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
> -		if (ret)
> -			DRM_ERROR("delayed enqueue failed %d\n", ret);
> -	}
> +	if (repoll)
> +		queue_delayed_work(system_nrt_wq, delayed_work, DRM_OUTPUT_POLL_PERIOD);
>   }
>
>   void drm_kms_helper_poll_disable(struct drm_device *dev)
> @@ -893,18 +889,14 @@ void drm_kms_helper_poll_enable(struct drm_device *dev)
>   {
>   	bool poll = false;
>   	struct drm_connector *connector;
> -	int ret;
>
>   	list_for_each_entry(connector,&dev->mode_config.connector_list, head) {
>   		if (connector->polled)
>   			poll = true;
>   	}
>
> -	if (poll) {
> -		ret = queue_delayed_work(system_nrt_wq,&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
> -		if (ret)
> -			DRM_ERROR("delayed enqueue failed %d\n", ret);
> -	}
> +	if (poll)
> +		queue_delayed_work(system_nrt_wq,&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
>   }
>   EXPORT_SYMBOL(drm_kms_helper_poll_enable);


I was getting the same spurious error messages, and this patches fixes it, thanks.
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