[Intel-gfx] [PATCH] drm/i915: Ensure dbuf state is defined

[Mika Kahola]

Ensure that the new dbuf state is not null. If so, throw
an error, discontinue to allocate ddb and return.

Signed-off-by: Mika Kahola <mika.kah...@intel.com>
---
 drivers/gpu/drm/i915/display/skl_watermark.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c 
b/drivers/gpu/drm/i915/display/skl_watermark.c
index d58e667016e4..4ecf3b43d6d2 100644
--- a/drivers/gpu/drm/i915/display/skl_watermark.c
+++ b/drivers/gpu/drm/i915/display/skl_watermark.c
@@ -638,6 +638,9 @@ skl_crtc_allocate_ddb(struct intel_atomic_state *state, 
struct intel_crtc *crtc)
        u32 start, end;
        int ret;
 
+       if (IS_ERR(new_dbuf_state))
+               return PTR_ERR(new_dbuf_state);
+
        if (new_dbuf_state->weight[pipe] == 0) {
                skl_ddb_entry_init(&new_dbuf_state->ddb[pipe], 0, 0);
                goto out;
-- 
2.34.1