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


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