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drm/vmwgfx: Kill some lockdep warnings

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Some global KMS state that is elsewhere protected by the mode_config
mutex here needs to be protected with a local mutex. Remove corresponding
lockdep checks and introduce a new driver-private global_kms_state_mutex,
and make sure its locking order is *after* the crtc locks in order to
avoid having to release those when the new mutex is taken.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>
Cc: <stable@vger.kernel.org> # 4.6
This commit is contained in:
Thomas Hellstrom
2016-05-03 11:24:35 +02:00
parent 7c10ddf874
commit 93cd16817a
5 changed files with 21 additions and 14 deletions
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27
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@@ -2143,13 +2143,13 @@ int vmw_kms_fbdev_init_data(struct vmw_private *dev_priv,
void vmw_kms_del_active(struct vmw_private *dev_priv,
struct vmw_display_unit *du)
{
lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
mutex_lock(&dev_priv->global_kms_state_mutex);
if (du->active_implicit) {
if (--(dev_priv->num_implicit) == 0)
dev_priv->implicit_fb = NULL;
du->active_implicit = false;
}
mutex_unlock(&dev_priv->global_kms_state_mutex);
}
/**
@@ -2165,8 +2165,7 @@ void vmw_kms_add_active(struct vmw_private *dev_priv,
struct vmw_display_unit *du,
struct vmw_framebuffer *vfb)
{
lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
mutex_lock(&dev_priv->global_kms_state_mutex);
WARN_ON_ONCE(!dev_priv->num_implicit && dev_priv->implicit_fb);
if (!du->active_implicit && du->is_implicit) {
@@ -2174,6 +2173,7 @@ void vmw_kms_add_active(struct vmw_private *dev_priv,
du->active_implicit = true;
dev_priv->num_implicit++;
}
mutex_unlock(&dev_priv->global_kms_state_mutex);
}
/**
@@ -2190,16 +2190,13 @@ bool vmw_kms_crtc_flippable(struct vmw_private *dev_priv,
struct drm_crtc *crtc)
{
struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
bool ret;
lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
mutex_lock(&dev_priv->global_kms_state_mutex);
ret = !du->is_implicit || dev_priv->num_implicit == 1;
mutex_unlock(&dev_priv->global_kms_state_mutex);
if (!du->is_implicit)
return true;
if (dev_priv->num_implicit != 1)
return false;
return true;
return ret;
}
/**
@@ -2214,16 +2211,18 @@ void vmw_kms_update_implicit_fb(struct vmw_private *dev_priv,
struct vmw_display_unit *du = vmw_crtc_to_du(crtc);
struct vmw_framebuffer *vfb;
lockdep_assert_held_once(&dev_priv->dev->mode_config.mutex);
mutex_lock(&dev_priv->global_kms_state_mutex);
if (!du->is_implicit)
return;
goto out_unlock;
vfb = vmw_framebuffer_to_vfb(crtc->primary->fb);
WARN_ON_ONCE(dev_priv->num_implicit != 1 &&
dev_priv->implicit_fb != vfb);
dev_priv->implicit_fb = vfb;
out_unlock:
mutex_unlock(&dev_priv->global_kms_state_mutex);
}
/**