[PATCH 57/62] drm: Remove drm_syncobj_fd_to_handle

[Matthew Wilcox]

From: Matthew Wilcox <mawil...@microsoft.com>

Now that the IDR handles its own locking, by removing our own lock, we
can also remove the idr_preload calls.

Also add a missing put call in a failure path.

Signed-off-by: Matthew Wilcox <mawil...@microsoft.com>
---
 drivers/gpu/drm/drm_syncobj.c | 23 +++++------------------
 include/drm/drm_file.h        |  2 --
 2 files changed, 5 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index f776fc1cc543..fec56b26a0b6 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -68,14 +68,14 @@ struct drm_syncobj *drm_syncobj_find(struct drm_file 
*file_private,
 {
        struct drm_syncobj *syncobj;
 
-       spin_lock(&file_private->syncobj_table_lock);
+       idr_lock(&file_private->syncobj_idr);
 
        /* Check if we currently have a reference on the object */
        syncobj = idr_find(&file_private->syncobj_idr, handle);
        if (syncobj)
                drm_syncobj_get(syncobj);
 
-       spin_unlock(&file_private->syncobj_table_lock);
+       idr_unlock(&file_private->syncobj_idr);
 
        return syncobj;
 }
@@ -309,13 +309,7 @@ int drm_syncobj_get_handle(struct drm_file *file_private,
        /* take a reference to put in the idr */
        drm_syncobj_get(syncobj);
 
-       idr_preload(GFP_KERNEL);
-       spin_lock(&file_private->syncobj_table_lock);
-       ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
-       spin_unlock(&file_private->syncobj_table_lock);
-
-       idr_preload_end();
-
+       ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_KERNEL);
        if (ret < 0) {
                drm_syncobj_put(syncobj);
                return ret;
@@ -346,9 +340,7 @@ static int drm_syncobj_destroy(struct drm_file 
*file_private,
 {
        struct drm_syncobj *syncobj;
 
-       spin_lock(&file_private->syncobj_table_lock);
        syncobj = idr_remove(&file_private->syncobj_idr, handle);
-       spin_unlock(&file_private->syncobj_table_lock);
 
        if (!syncobj)
                return -EINVAL;
@@ -449,14 +441,10 @@ static int drm_syncobj_fd_to_handle(struct drm_file 
*file_private,
        /* take a reference to put in the idr */
        drm_syncobj_get(syncobj);
 
-       idr_preload(GFP_KERNEL);
-       spin_lock(&file_private->syncobj_table_lock);
-       ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_NOWAIT);
-       spin_unlock(&file_private->syncobj_table_lock);
-       idr_preload_end();
-
+       ret = idr_alloc(&file_private->syncobj_idr, syncobj, 1, 0, GFP_KERNEL);
        if (ret < 0) {
                fput(syncobj->file);
+               drm_syncobj_put(syncobj);
                return ret;
        }
        *handle = ret;
@@ -527,7 +515,6 @@ void
 drm_syncobj_open(struct drm_file *file_private)
 {
        idr_init(&file_private->syncobj_idr);
-       spin_lock_init(&file_private->syncobj_table_lock);
 }
 
 static int
diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
index dd3520d8ce60..dfabc20a5934 100644
--- a/include/drm/drm_file.h
+++ b/include/drm/drm_file.h
@@ -231,8 +231,6 @@ struct drm_file {
 
        /** @syncobj_idr: Mapping of sync object handles to object pointers. */
        struct idr syncobj_idr;
-       /** @syncobj_table_lock: Protects @syncobj_idr. */
-       spinlock_t syncobj_table_lock;
 
        /** @filp: Pointer to the core file structure. */
        struct file *filp;
-- 
2.15.0