drm/amd/display: add missing null check

[why]
There is a coding error for a missing null check for stream pointer when iterating through
pipe_ctx.

Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Jasdeep Dhillon <jdhillon@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
index 7544ac8..ba45b22 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/dcn32/dcn32_hwseq.c
@@ -1303,7 +1303,7 @@ static void apply_symclk_on_tx_off_wa(struct dc_link *link)
        if (link->phy_state.symclk_ref_cnts.otg > 0) {
                for (i = 0; i < MAX_PIPES; i++) {
                        pipe_ctx = &dc->current_state->res_ctx.pipe_ctx[i];
-                       if (pipe_ctx->stream->link == link && pipe_ctx->top_pipe == NULL) {
+                       if (pipe_ctx->stream && pipe_ctx->stream->link == link && pipe_ctx->top_pipe == NULL) {
                                pipe_ctx->clock_source->funcs->program_pix_clk(
                                                pipe_ctx->clock_source,
                                                &pipe_ctx->stream_res.pix_clk_params,