drm/amd/display: do not allocate display_mode_lib unnecessarily

This allocation isn't required and can fail when resuming from suspend.

Bug: https://gitlab.freedesktop.org/drm/amd/issues/1009
Signed-off-by: Dor Askayo <dor.askayo@gmail.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 6c797fa..04441db 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -2462,12 +2462,7 @@ void dc_set_power_state(
        enum dc_acpi_cm_power_state power_state)
 {
        struct kref refcount;
-       struct display_mode_lib *dml = kzalloc(sizeof(struct display_mode_lib),
-                                               GFP_KERNEL);
-
-       ASSERT(dml);
-       if (!dml)
-               return;
+       struct display_mode_lib *dml;
 
        switch (power_state) {
        case DC_ACPI_CM_POWER_STATE_D0:
@@ -2490,6 +2485,12 @@ void dc_set_power_state(
                 * clean state, and dc hw programming optimizations will not
                 * cause any trouble.
                 */
+               dml = kzalloc(sizeof(struct display_mode_lib),
+                               GFP_KERNEL);
+
+               ASSERT(dml);
+               if (!dml)
+                       return;
 
                /* Preserve refcount */
                refcount = dc->current_state->refcount;
@@ -2503,10 +2504,10 @@ void dc_set_power_state(
                dc->current_state->refcount = refcount;
                dc->current_state->bw_ctx.dml = *dml;
 
+               kfree(dml);
+
                break;
        }
-
-       kfree(dml);
 }
 
 void dc_resume(struct dc *dc)