Re: [PATCH 2/2] drm: set dev_mapping before calling drm_open_helper

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Reviewed-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>

On 10/29/2012 06:35 PM, Ilija Hadzic wrote:
Some drivers (specifically vmwgfx) look at dev_mapping
in their open hook, so we have to set dev->dev_mapping
earlier in the process.

Reference:
http://lists.freedesktop.org/archives/dri-devel/2012-October/029420.html

Signed-off-by: Ilija Hadzic <ihadzic@xxxxxxxxxxxxxxxxxxxxxx>
Reported-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
  drivers/gpu/drm/drm_fops.c | 47 +++++++++++++++++++++++++++++-----------------
  1 file changed, 30 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/drm_fops.c b/drivers/gpu/drm/drm_fops.c
index af68eca..133b413 100644
--- a/drivers/gpu/drm/drm_fops.c
+++ b/drivers/gpu/drm/drm_fops.c
@@ -121,6 +121,8 @@ int drm_open(struct inode *inode, struct file *filp)
  	int minor_id = iminor(inode);
  	struct drm_minor *minor;
  	int retcode = 0;
+	int need_setup = 0;
+	struct address_space *old_mapping;
minor = idr_find(&drm_minors_idr, minor_id);
  	if (!minor)
@@ -132,26 +134,37 @@ int drm_open(struct inode *inode, struct file *filp)
  	if (drm_device_is_unplugged(dev))
  		return -ENODEV;
+ if (!dev->open_count++)
+		need_setup = 1;
+	mutex_lock(&dev->struct_mutex);
+	old_mapping = dev->dev_mapping;
+	if (old_mapping == NULL)
+		dev->dev_mapping = &inode->i_data;
+	/* ihold ensures nobody can remove inode with our i_data */
+	ihold(container_of(dev->dev_mapping, struct inode, i_data));
+	inode->i_mapping = dev->dev_mapping;
+	filp->f_mapping = dev->dev_mapping;
+	mutex_unlock(&dev->struct_mutex);
+
  	retcode = drm_open_helper(inode, filp, dev);
-	if (!retcode) {
-		atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
-		if (!dev->open_count++) {
-			retcode = drm_setup(dev);
-			if (retcode)
-				dev->open_count--;
-		}
-	}
-	if (!retcode) {
-		mutex_lock(&dev->struct_mutex);
-		if (dev->dev_mapping == NULL)
-			dev->dev_mapping = &inode->i_data;
-		/* ihold ensures nobody can remove inode with our i_data */
-		ihold(container_of(dev->dev_mapping, struct inode, i_data));
-		inode->i_mapping = dev->dev_mapping;
-		filp->f_mapping = dev->dev_mapping;
-		mutex_unlock(&dev->struct_mutex);
+	if (retcode)
+		goto err_undo;
+	atomic_inc(&dev->counts[_DRM_STAT_OPENS]);
+	if (need_setup) {
+		retcode = drm_setup(dev);
+		if (retcode)
+			goto err_undo;
  	}
+	return 0;
+err_undo:
+	mutex_lock(&dev->struct_mutex);
+	filp->f_mapping = old_mapping;
+	inode->i_mapping = old_mapping;
+	iput(container_of(dev->dev_mapping, struct inode, i_data));
+	dev->dev_mapping = old_mapping;
+	mutex_unlock(&dev->struct_mutex);
+	dev->open_count--;
  	return retcode;
  }
  EXPORT_SYMBOL(drm_open);

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