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amdgpu/dc: convert dc_transfer to use a kref.

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Rolling your own atomic ref counts is frowned upon.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dave Airlie 2017-10-03 12:38:57 +10:00 committed by Alex Deucher
parent 5d15ae23f8
commit 9305213256
3 changed files with 12 additions and 9 deletions
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17
drivers/gpu/drm/amd/display/dc/core/dc_surface.c
View File

@ -161,17 +161,18 @@ struct dc_gamma *dc_create_gamma()
void dc_transfer_func_retain(struct dc_transfer_func *tf)
{
ASSERT(atomic_read(&tf->ref_count) > 0);
atomic_inc(&tf->ref_count);
kref_get(&tf->refcount);
}
static void dc_transfer_func_free(struct kref *kref)
{
struct dc_transfer_func *tf = container_of(kref, struct dc_transfer_func, refcount);
kfree(tf);
}
void dc_transfer_func_release(struct dc_transfer_func *tf)
{
ASSERT(atomic_read(&tf->ref_count) > 0);
atomic_dec(&tf->ref_count);
if (atomic_read(&tf->ref_count) == 0)
kfree(tf);
kref_put(&tf->refcount, dc_transfer_func_free);
}
struct dc_transfer_func *dc_create_transfer_func()
@ -181,7 +182,7 @@ struct dc_transfer_func *dc_create_transfer_func()
if (tf == NULL)
goto alloc_fail;
atomic_inc(&tf->ref_count);
kref_init(&tf->refcount);
return tf;

2
drivers/gpu/drm/amd/display/dc/dc.h
View File

@ -330,11 +330,11 @@ enum dc_transfer_func_predefined {
};
struct dc_transfer_func {
struct kref refcount;
struct dc_transfer_func_distributed_points tf_pts;
enum dc_transfer_func_type type;
enum dc_transfer_func_predefined tf;
struct dc_context *ctx;
atomic_t ref_count;
};
/*

2
drivers/gpu/drm/amd/display/dc/os_types.h
View File

@ -32,6 +32,8 @@
#include <linux/types.h>
#include <drm/drmP.h>
#include <linux/kref.h>
#include "cgs_linux.h"
#if defined(__BIG_ENDIAN) && !defined(BIGENDIAN_CPU)