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drm/armada: use a private mutex to protect priv->linear

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Reusing the Big DRM Lock just leaks, and the few things left that
dev->struct_mutex protected are very well contained - it's just the
linear drm_mm manager.

With this armada is completely struct_mutex free!

v2: Convert things properly and also take the lock in
armada_gem_free_object, and remove the stale comment (Russell).

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Daniel Vetter
2015-11-24 10:00:36 +01:00
committed by Russell King
parent 4bd3fd443a
commit 0b8ebeacf5
4 changed files with 14 additions and 8 deletions
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14
drivers/gpu/drm/armada/armada_gem.c
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@@ -46,22 +46,26 @@ static size_t roundup_gem_size(size_t size)
return roundup(size, PAGE_SIZE);
}
/* dev->struct_mutex is held here */
void armada_gem_free_object(struct drm_gem_object *obj)
{
struct armada_gem_object *dobj = drm_to_armada_gem(obj);
struct armada_private *priv = obj->dev->dev_private;
DRM_DEBUG_DRIVER("release obj %p\n", dobj);
drm_gem_free_mmap_offset(&dobj->obj);
might_lock(&priv->linear_lock);
if (dobj->page) {
/* page backed memory */
unsigned int order = get_order(dobj->obj.size);
__free_pages(dobj->page, order);
} else if (dobj->linear) {
/* linear backed memory */
mutex_lock(&priv->linear_lock);
drm_mm_remove_node(dobj->linear);
mutex_unlock(&priv->linear_lock);
kfree(dobj->linear);
if (dobj->addr)
iounmap(dobj->addr);
@@ -144,10 +148,10 @@ armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
if (!node)
return -ENOSPC;
mutex_lock(&dev->struct_mutex);
mutex_lock(&priv->linear_lock);
ret = drm_mm_insert_node(&priv->linear, node, size, align,
DRM_MM_SEARCH_DEFAULT);
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&priv->linear_lock);
if (ret) {
kfree(node);
return ret;
@@ -158,9 +162,9 @@ armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
/* Ensure that the memory we're returning is cleared. */
ptr = ioremap_wc(obj->linear->start, size);
if (!ptr) {
mutex_lock(&dev->struct_mutex);
mutex_lock(&priv->linear_lock);
drm_mm_remove_node(obj->linear);
mutex_unlock(&dev->struct_mutex);
mutex_unlock(&priv->linear_lock);
kfree(obj->linear);
obj->linear = NULL;
return -ENOMEM;