drm/ttm: Fixes for "Memory accounting rework."

ttm:
Fix error paths when kobject_add returns an error.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c
index 62fb5cf..072c281 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_memory.c
+++ b/drivers/gpu/drm/ttm/ttm_memory.c
@@ -244,6 +244,7 @@ static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
 {
        struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
        uint64_t mem;
+       int ret;
 
        if (unlikely(!zone))
                return -ENOMEM;
@@ -259,9 +260,14 @@ static int ttm_mem_init_kernel_zone(struct ttm_mem_global *glob,
        zone->used_mem = 0;
        zone->glob = glob;
        glob->zone_kernel = zone;
-       glob->zones[glob->num_zones++] = zone;
        kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
-       return kobject_add(&zone->kobj, &glob->kobj, zone->name);
+       ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
+       if (unlikely(ret != 0)) {
+               kobject_put(&zone->kobj);
+               return ret;
+       }
+       glob->zones[glob->num_zones++] = zone;
+       return 0;
 }
 
 #ifdef CONFIG_HIGHMEM
@@ -270,6 +276,7 @@ static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
 {
        struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
        uint64_t mem;
+       int ret;
 
        if (unlikely(!zone))
                return -ENOMEM;
@@ -288,9 +295,14 @@ static int ttm_mem_init_highmem_zone(struct ttm_mem_global *glob,
        zone->used_mem = 0;
        zone->glob = glob;
        glob->zone_highmem = zone;
-       glob->zones[glob->num_zones++] = zone;
        kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
-       return kobject_add(&zone->kobj, &glob->kobj, zone->name);
+       ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
+       if (unlikely(ret != 0)) {
+               kobject_put(&zone->kobj);
+               return ret;
+       }
+       glob->zones[glob->num_zones++] = zone;
+       return 0;
 }
 #else
 static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
@@ -298,6 +310,7 @@ static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
 {
        struct ttm_mem_zone *zone = kzalloc(sizeof(*zone), GFP_KERNEL);
        uint64_t mem;
+       int ret;
 
        if (unlikely(!zone))
                return -ENOMEM;
@@ -327,9 +340,14 @@ static int ttm_mem_init_dma32_zone(struct ttm_mem_global *glob,
        zone->used_mem = 0;
        zone->glob = glob;
        glob->zone_dma32 = zone;
-       glob->zones[glob->num_zones++] = zone;
        kobject_init(&zone->kobj, &ttm_mem_zone_kobj_type);
-       return kobject_add(&zone->kobj, &glob->kobj, zone->name);
+       ret = kobject_add(&zone->kobj, &glob->kobj, zone->name);
+       if (unlikely(ret != 0)) {
+               kobject_put(&zone->kobj);
+               return ret;
+       }
+       glob->zones[glob->num_zones++] = zone;
+       return 0;
 }
 #endif
 
@@ -348,8 +366,10 @@ int ttm_mem_global_init(struct ttm_mem_global *glob)
        ret = kobject_add(&glob->kobj,
                          ttm_get_kobj(),
                          "memory_accounting");
-       if (unlikely(ret != 0))
-               goto out_no_zone;
+       if (unlikely(ret != 0)) {
+               kobject_put(&glob->kobj);
+               return ret;
+       }
 
        si_meminfo(&si);