drm: make minor->index available early

Instead of allocating the minor-index during registration, we now do this
during allocation. This way, debug-messages between minor-allocation and
minor-registration will now use the correct minor instead of 0. Same is
done for unregistration vs. free, so debug-messages between
device-shutdown and device-destruction show proper indices.

Even though minor-indices are allocated early, we don't enable minor
lookup early. Instead, we keep the entry set to NULL and replace it during
registration / unregistration. This way, the index is allocated but lookup
only works if registered.

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
This commit is contained in:
David Herrmann 2014-07-23 10:34:52 +02:00
Родитель ec8f112db2
Коммит f1b8596283
1 изменённых файлов: 46 добавлений и 38 удалений

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@ -256,6 +256,8 @@ static struct drm_minor **drm_minor_get_slot(struct drm_device *dev,
static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
{
struct drm_minor *minor;
unsigned long flags;
int r;
minor = kzalloc(sizeof(*minor), GFP_KERNEL);
if (!minor)
@ -264,57 +266,68 @@ static int drm_minor_alloc(struct drm_device *dev, unsigned int type)
minor->type = type;
minor->dev = dev;
idr_preload(GFP_KERNEL);
spin_lock_irqsave(&drm_minor_lock, flags);
r = idr_alloc(&drm_minors_idr,
NULL,
64 * type,
64 * (type + 1),
GFP_NOWAIT);
spin_unlock_irqrestore(&drm_minor_lock, flags);
idr_preload_end();
if (r < 0)
goto err_free;
minor->index = r;
*drm_minor_get_slot(dev, type) = minor;
return 0;
err_free:
kfree(minor);
return r;
}
static void drm_minor_free(struct drm_device *dev, unsigned int type)
{
struct drm_minor **slot;
struct drm_minor **slot, *minor;
unsigned long flags;
slot = drm_minor_get_slot(dev, type);
if (*slot) {
drm_mode_group_destroy(&(*slot)->mode_group);
kfree(*slot);
*slot = NULL;
}
minor = *slot;
if (!minor)
return;
drm_mode_group_destroy(&minor->mode_group);
spin_lock_irqsave(&drm_minor_lock, flags);
idr_remove(&drm_minors_idr, minor->index);
spin_unlock_irqrestore(&drm_minor_lock, flags);
kfree(minor);
*slot = NULL;
}
static int drm_minor_register(struct drm_device *dev, unsigned int type)
{
struct drm_minor *new_minor;
struct drm_minor *minor;
unsigned long flags;
int ret;
int minor_id;
DRM_DEBUG("\n");
new_minor = *drm_minor_get_slot(dev, type);
if (!new_minor)
minor = *drm_minor_get_slot(dev, type);
if (!minor)
return 0;
idr_preload(GFP_KERNEL);
spin_lock_irqsave(&drm_minor_lock, flags);
minor_id = idr_alloc(&drm_minors_idr,
NULL,
64 * type,
64 * (type + 1),
GFP_NOWAIT);
spin_unlock_irqrestore(&drm_minor_lock, flags);
idr_preload_end();
if (minor_id < 0)
return minor_id;
new_minor->index = minor_id;
ret = drm_debugfs_init(new_minor, minor_id, drm_debugfs_root);
ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root);
if (ret) {
DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n");
goto err_id;
return ret;
}
ret = drm_sysfs_device_add(new_minor);
ret = drm_sysfs_device_add(minor);
if (ret) {
DRM_ERROR("DRM: Error sysfs_device_add.\n");
goto err_debugfs;
@ -322,19 +335,14 @@ static int drm_minor_register(struct drm_device *dev, unsigned int type)
/* replace NULL with @minor so lookups will succeed from now on */
spin_lock_irqsave(&drm_minor_lock, flags);
idr_replace(&drm_minors_idr, new_minor, new_minor->index);
idr_replace(&drm_minors_idr, minor, minor->index);
spin_unlock_irqrestore(&drm_minor_lock, flags);
DRM_DEBUG("new minor assigned %d\n", minor_id);
DRM_DEBUG("new minor registered %d\n", minor->index);
return 0;
err_debugfs:
drm_debugfs_cleanup(new_minor);
err_id:
spin_lock_irqsave(&drm_minor_lock, flags);
idr_remove(&drm_minors_idr, minor_id);
spin_unlock_irqrestore(&drm_minor_lock, flags);
new_minor->index = 0;
drm_debugfs_cleanup(minor);
return ret;
}
@ -347,10 +355,10 @@ static void drm_minor_unregister(struct drm_device *dev, unsigned int type)
if (!minor || !minor->kdev)
return;
/* replace @minor with NULL so lookups will fail from now on */
spin_lock_irqsave(&drm_minor_lock, flags);
idr_remove(&drm_minors_idr, minor->index);
idr_replace(&drm_minors_idr, NULL, minor->index);
spin_unlock_irqrestore(&drm_minor_lock, flags);
minor->index = 0;
drm_debugfs_cleanup(minor);
drm_sysfs_device_remove(minor);