linux-kernel - Re: [PATCH wq#for-linus] drm: fix a fallout from slow-work -> wq conversion

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Date:	Mon, 9 Aug 2010 12:14:06 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	Tejun Heo <htejun@...il.com>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	walt <w41ter@...il.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 wq#for-linus] drm: fix a fallout from slow-work -> wq
 conversion

On Mon, Aug 09, 2010 at 12:00:49PM +0200, Tejun Heo wrote:
> 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.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reported-by: Markus Trippelsdorf <markus@...ppelsdorf.de>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: dri-devel@...ts.freedesktop.org
> ---
> Markus, it's almost trivial but it would be great if you can test this
> one too.

Looks good, but drm_kms_helper_poll_disable needs the same treatment.


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);
 
-- 
»A man who doesn't know he is in prison can never escape.«
William S. Burroughs
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