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From: Chris Wilson <chris@chris-wilson.co.uk>
To: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Daniel Vetter <daniel.vetter@intel.com>,
	Intel Graphics Development <intel-gfx@lists.freedesktop.org>,
	DRI Development <dri-devel@lists.freedesktop.org>
Subject: Re: [PATCH 07/14] drm: Only do the hw.lock cleanup in master_relase for !MODESET
Date: Wed, 15 Jun 2016 12:48:23 +0100	[thread overview]
Message-ID: <20160615114823.GK4184@nuc-i3427.alporthouse.com> (raw)
In-Reply-To: <1465930269-7883-8-git-send-email-daniel.vetter@ffwll.ch>

On Tue, Jun 14, 2016 at 08:51:02PM +0200, Daniel Vetter wrote:
> Another place gone where modern drivers could have hit
> dev->struct_mutex.
> 
> To avoid too deeply nesting control flow rework it a bit.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/drm_auth.c | 20 ++++++++++++--------
>  1 file changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_auth.c b/drivers/gpu/drm/drm_auth.c
> index e015a7edb154..a58b2eb0d004 100644
> --- a/drivers/gpu/drm/drm_auth.c
> +++ b/drivers/gpu/drm/drm_auth.c
> @@ -246,11 +246,14 @@ int drm_master_open(struct drm_file *file_priv)
>  void drm_master_release(struct drm_file *file_priv)
>  {
>  	struct drm_device *dev = file_priv->minor->dev;
> +	struct drm_master *master = file_priv->master;
> +

Spare newline.

>  	mutex_lock(&dev->master_mutex);
> -	if (file_priv->is_master) {
> -		struct drm_master *master = file_priv->master;
> +	if (!file_priv->is_master)
> +		goto out_unlock;
>  
> +	if (!drm_core_check_feature(dev, DRIVER_MODESET)) {
>  		/*
>  		 * Since the master is disappearing, so is the
>  		 * possibility to lock.
> @@ -264,19 +267,20 @@ void drm_master_release(struct drm_file *file_priv)
>  			wake_up_interruptible_all(&master->lock.lock_queue);
>  		}
>  		mutex_unlock(&dev->struct_mutex);
> +	}
>  
> -		if (file_priv->minor->master == file_priv->master) {
> -			/* drop the reference held my the minor */
> -			if (dev->driver->master_drop)
> -				dev->driver->master_drop(dev, file_priv, true);
> -			drm_master_put(&file_priv->minor->master);
> -		}
> +	if (file_priv->minor->master == file_priv->master) {
> +		/* drop the reference held my the minor */
> +		if (dev->driver->master_drop)
> +			dev->driver->master_drop(dev, file_priv, true);
> +		drm_master_put(&file_priv->minor->master);
>  	}
>  
>  	/* drop the master reference held by the file priv */
>  	if (file_priv->master)
>  		drm_master_put(&file_priv->master);
>  	file_priv->is_master = 0;
> +out_unlock:

This changes the reference counting, and from my quick scan we can have
a reference on file_priv->master but file_priv->is_master == 0.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

  reply	other threads:[~2016-06-15 11:48 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-14 18:50 [PATCH 00/14] Cruft removal around drm_master Daniel Vetter
2016-06-14 18:50 ` [PATCH 01/14] drm: Nuke legacy maps debugfs files Daniel Vetter
2016-06-15 11:23   ` Chris Wilson
2016-06-15 12:00   ` Emil Velikov
2016-06-14 18:50 ` [PATCH 02/14] drm: Hide hw.lock cleanup in filp->release better Daniel Vetter
2016-06-15 11:26   ` [Intel-gfx] " Chris Wilson
2016-06-15 12:10   ` Emil Velikov
2016-06-14 18:50 ` [PATCH 03/14] drm: Link directly from drm_master to drm_device Daniel Vetter
2016-06-15 11:29   ` Chris Wilson
2016-06-15 12:50   ` [Intel-gfx] " Emil Velikov
2016-06-15 15:45     ` Daniel Vetter
2016-06-16 20:04       ` Emil Velikov
2016-06-14 18:50 ` [PATCH 04/14] drm: Move master functions into drm_auth.c Daniel Vetter
2016-06-15 11:31   ` Chris Wilson
2016-06-15 15:47     ` Daniel Vetter
2016-06-14 18:51 ` [PATCH 05/14] drm: Extract drm_master_open Daniel Vetter
2016-06-15 11:41   ` [Intel-gfx] " Chris Wilson
2016-06-14 18:51 ` [PATCH 06/14] drm: Extract drm_master_relase Daniel Vetter
2016-06-15 11:43   ` [Intel-gfx] " Chris Wilson
2016-06-16  8:18     ` Daniel Vetter
2016-06-14 18:51 ` [PATCH 07/14] drm: Only do the hw.lock cleanup in master_relase for !MODESET Daniel Vetter
2016-06-15 11:48   ` Chris Wilson [this message]
2016-06-15 15:49     ` [Intel-gfx] " Daniel Vetter
2016-06-14 18:51 ` [PATCH 08/14] drm: Move authmagic cleanup into drm_master_release Daniel Vetter
2016-06-15 11:51   ` Chris Wilson
2016-06-14 18:51 ` [PATCH 09/14] drm: Protect authmagic with master_mutex Daniel Vetter
2016-06-15 11:54   ` [Intel-gfx] " Chris Wilson
2016-06-15 15:52     ` Daniel Vetter
2016-06-14 18:51 ` [PATCH 10/14] drm: Mark authmagic ioctls as unlocked Daniel Vetter
2016-06-15 11:55   ` [Intel-gfx] " Chris Wilson
2016-06-14 18:51 ` [PATCH 11/14] drm: Mark set/drop master ioctl " Daniel Vetter
2016-06-15 11:56   ` [Intel-gfx] " Chris Wilson
2016-06-14 18:51 ` [PATCH 12/14] drm: Move master pointer from drm_minor to drm_device Daniel Vetter
2016-06-15 12:10   ` [Intel-gfx] " Chris Wilson
2016-06-15 16:01     ` Daniel Vetter
2016-06-15 16:33       ` Chris Wilson
2016-06-15 19:54         ` [Intel-gfx] " Daniel Vetter
2016-06-14 18:51 ` [PATCH 13/14] drm: Clean up drm_crtc.h Daniel Vetter
2016-06-14 18:51 ` [PATCH 14/14] drm: Use dev->name as fallback for dev->unique Daniel Vetter
2016-06-15  5:42 ` ✓ Ro.CI.BAT: success for Cruft removal around drm_master Patchwork

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