[PATCH 5/8] drm/vmwgfx: use ida_simple_get for id allocation.

[Jonathan Cameron]

Some messing with error codes to return 0 on out id's and match
current situation.  Is this necessary? Looks a touch 'interesting'.

Signed-off-by: Jonathan Cameron <jic23 at cam.ac.uk>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c |   34 ++++++-------------------
 1 files changed, 8 insertions(+), 26 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c 
b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
index ac6e0d1..d51577b 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gmrid_manager.c
@@ -37,7 +37,6 @@
 #include <linux/kernel.h>

 struct vmwgfx_gmrid_man {
-       spinlock_t lock;
        struct ida gmr_ida;
        uint32_t max_gmr_ids;
 };
@@ -49,34 +48,20 @@ static int vmw_gmrid_man_get_node(struct 
ttm_mem_type_manager *man,
 {
        struct vmwgfx_gmrid_man *gman =
                (struct vmwgfx_gmrid_man *)man->priv;
-       int ret;
        int id;

        mem->mm_node = NULL;

-       do {
-               if (unlikely(ida_pre_get(&gman->gmr_ida, GFP_KERNEL) == 0))
-                       return -ENOMEM;
-
-               spin_lock(&gman->lock);
-               ret = ida_get_new(&gman->gmr_ida, &id);
-
-               if (unlikely(ret == 0 && id >= gman->max_gmr_ids)) {
-                       ida_remove(&gman->gmr_ida, id);
-                       spin_unlock(&gman->lock);
+       id = ida_simple_get(&gman->gmr_ida, 0, gman->max_gmr_ids, GFP_KERNEL);
+       if (id < 0) {
+               if (id == -ENOSPC)
                        return 0;
-               }
-
-               spin_unlock(&gman->lock);
-
-       } while (ret == -EAGAIN);
-
-       if (likely(ret == 0)) {
-               mem->mm_node = gman;
-               mem->start = id;
+               return id;
        }
+       mem->mm_node = gman;
+       mem->start = id;

-       return ret;
+       return 0;
 }

 static void vmw_gmrid_man_put_node(struct ttm_mem_type_manager *man,
@@ -86,9 +71,7 @@ static void vmw_gmrid_man_put_node(struct 
ttm_mem_type_manager *man,
                (struct vmwgfx_gmrid_man *)man->priv;

        if (mem->mm_node) {
-               spin_lock(&gman->lock);
-               ida_remove(&gman->gmr_ida, mem->start);
-               spin_unlock(&gman->lock);
+               ida_simple_remove(&gman->gmr_ida, mem->start);
                mem->mm_node = NULL;
        }
 }
@@ -102,7 +85,6 @@ static int vmw_gmrid_man_init(struct ttm_mem_type_manager 
*man,
        if (unlikely(gman == NULL))
                return -ENOMEM;

-       spin_lock_init(&gman->lock);
        ida_init(&gman->gmr_ida);
        gman->max_gmr_ids = p_size;
        man->priv = (void *) gman;
-- 
1.7.3.4