[PATCH] drm/amd/display: Add check for memory allocation

[Jiasheng Jiang]

As kzalloc and dm_helpers_allocate_gpu_mem can return NULL pointer,
it should be better to check the return value and return error.
Moreover, the return value of dcn32_clk_mgr_construct should be checked
by cascade.

Fixes: 265280b99822 ("drm/amd/display: add CLKMGR changes for DCN32/321")
Signed-off-by: Jiasheng Jiang <jiash...@iscas.ac.cn>
---
 .../drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c   | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c 
b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
index c6785969eb1a..3dc04d780fbf 100644
--- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
+++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn32/dcn32_clk_mgr.c
@@ -718,7 +718,7 @@ static struct clk_mgr_funcs dcn32_funcs = {
                .is_smu_present = dcn32_is_smu_present,
 };
 
-void dcn32_clk_mgr_construct(
+int dcn32_clk_mgr_construct(
                struct dc_context *ctx,
                struct clk_mgr_internal *clk_mgr,
                struct pp_smu_funcs *pp_smu,
@@ -779,11 +779,19 @@ void dcn32_clk_mgr_construct(
        clk_mgr->smu_present = false;
 
        clk_mgr->base.bw_params = kzalloc(sizeof(*clk_mgr->base.bw_params), 
GFP_KERNEL);
+       if (!clk_mgr->base.bw_params)
+               return -ENOMEM;
 
        /* need physical address of table to give to PMFW */
        clk_mgr->wm_range_table = dm_helpers_allocate_gpu_mem(clk_mgr->base.ctx,
                        DC_MEM_ALLOC_TYPE_GART, sizeof(WatermarksExternal_t),
                        &clk_mgr->wm_range_table_addr);
+       if (!clk_mgr->wm_range_table) {
+               kfree(clk_mgr->base.bw_params);
+               return -ENOMEM;
+       }
+
+       return 0;
 }
 
 void dcn32_clk_mgr_destroy(struct clk_mgr_internal *clk_mgr)
-- 
2.25.1