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
armage_gem_free_object, and remove the stale comment (Russell).
Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
---
drivers/gpu/drm/armada/armada_debugfs.c | 4 ++--
drivers/gpu/drm/armada/armada_drm.h | 3 ++-
drivers/gpu/drm/armada/armada_drv.c | 1 +
drivers/gpu/drm/armada/armada_gem.c | 14 +++++++++-----
4 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/gpu/drm/armada/armada_debugfs.c b/drivers/gpu/drm/armada/armada_debugfs.c
index 471e45627f1e..d4f7ab0a30d4 100644
--- a/drivers/gpu/drm/armada/armada_debugfs.c
+++ b/drivers/gpu/drm/armada/armada_debugfs.c
@@ -21,9 +21,9 @@ static int armada_debugfs_gem_linear_show(struct seq_file *m, void *data)
struct armada_private *priv = dev->dev_private;
int ret;
- mutex_lock(&dev->struct_mutex);
+ mutex_lock(&priv->linear_lock);
ret = drm_mm_dump_table(m, &priv->linear);
- mutex_unlock(&dev->struct_mutex);
+ mutex_unlock(&priv->linear_lock);
return ret;
}
diff --git a/drivers/gpu/drm/armada/armada_drm.h b/drivers/gpu/drm/armada/armada_drm.h
index 4df6f2af2b21..3b2bb6128d40 100644
--- a/drivers/gpu/drm/armada/armada_drm.h
+++ b/drivers/gpu/drm/armada/armada_drm.h
@@ -57,7 +57,8 @@ struct armada_private {
DECLARE_KFIFO(fb_unref, struct drm_framebuffer *, 8);
struct drm_fb_helper *fbdev;
struct armada_crtc *dcrtc[2];
- struct drm_mm linear;
+ struct drm_mm linear; /* protected by linear_lock */
+ struct mutex linear_lock;
struct drm_property *csc_yuv_prop;
struct drm_property *csc_rgb_prop;
struct drm_property *colorkey_prop;
diff --git a/drivers/gpu/drm/armada/armada_drv.c b/drivers/gpu/drm/armada/armada_drv.c
index 77ab93d60125..3bd7e1cde99e 100644
--- a/drivers/gpu/drm/armada/armada_drv.c
+++ b/drivers/gpu/drm/armada/armada_drv.c
@@ -102,6 +102,7 @@ static int armada_drm_load(struct drm_device *dev, unsigned long flags)
dev->mode_config.preferred_depth = 24;
dev->mode_config.funcs = &armada_drm_mode_config_funcs;
drm_mm_init(&priv->linear, mem->start, resource_size(mem));
+ mutex_init(&priv->linear_lock);
ret = component_bind_all(dev->dev, dev);
if (ret)
diff --git a/drivers/gpu/drm/armada/armada_gem.c b/drivers/gpu/drm/armada/armada_gem.c
index e3a86b96af2a..6e731db31aa4 100644
--- a/drivers/gpu/drm/armada/armada_gem.c
+++ b/drivers/gpu/drm/armada/armada_gem.c
@@ -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;
--
2.5.1
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