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drm/ttm: fix re-init of global structures 

When a driver unloads without unloading TTM we don't correctly
clear the global structures leading to errors on re-init.

Next step should probably be to remove the global structures and
kobjs all together, but this is tricky since we need to maintain
backward compatibility.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Tested-by: Karol Herbst <kherbst@redhat.com>
CC: stable@vger.kernel.org # 5.0.x
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2019-04-16 11:49:17 +02:00 committed by Alex Deucher
parent 00fd14ff30
commit bd4264112f
3 changed files with 8 additions and 8 deletions
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10
drivers/gpu/drm/ttm/ttm_bo.c
View File

@ -49,9 +49,8 @@ static void ttm_bo_global_kobj_release(struct kobject *kobj);
* ttm_global_mutex - protecting the global BO state
*/
DEFINE_MUTEX(ttm_global_mutex);
struct ttm_bo_global ttm_bo_glob = {
.use_count = 0
};
unsigned ttm_bo_glob_use_count;
struct ttm_bo_global ttm_bo_glob;
static struct attribute ttm_bo_count = {
.name = "bo_count",
@ -1531,12 +1530,13 @@ static void ttm_bo_global_release(void)
struct ttm_bo_global *glob = &ttm_bo_glob;
mutex_lock(&ttm_global_mutex);
if (--glob->use_count > 0)
if (--ttm_bo_glob_use_count > 0)
goto out;
kobject_del(&glob->kobj);
kobject_put(&glob->kobj);
ttm_mem_global_release(&ttm_mem_glob);
memset(glob, 0, sizeof(*glob));
out:
mutex_unlock(&ttm_global_mutex);
}
@ -1548,7 +1548,7 @@ static int ttm_bo_global_init(void)
unsigned i;
mutex_lock(&ttm_global_mutex);
if (++glob->use_count > 1)
if (++ttm_bo_glob_use_count > 1)
goto out;
ret = ttm_mem_global_init(&ttm_mem_glob);

5
drivers/gpu/drm/ttm/ttm_memory.c
View File

@ -461,8 +461,8 @@ int ttm_mem_global_init(struct ttm_mem_global *glob)
void ttm_mem_global_release(struct ttm_mem_global *glob)
{
unsigned int i;
struct ttm_mem_zone *zone;
unsigned int i;
/* let the page allocator first stop the shrink work. */
ttm_page_alloc_fini();
@ -475,9 +475,10 @@ void ttm_mem_global_release(struct ttm_mem_global *glob)
zone = glob->zones[i];
kobject_del(&zone->kobj);
kobject_put(&zone->kobj);
}
}
kobject_del(&glob->kobj);
kobject_put(&glob->kobj);
memset(glob, 0, sizeof(*glob));
}
static void ttm_check_swapping(struct ttm_mem_global *glob)

1
include/drm/ttm/ttm_bo_driver.h
View File

@ -420,7 +420,6 @@ extern struct ttm_bo_global {
/**
* Protected by ttm_global_mutex.
*/
unsigned int use_count;
struct list_head device_list;
/**