drm/selftests/test-drm_dp_mst_helper: Move 'sideband_msg_req_encode_decode' onto...

There is too much data being stored on the stack.

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c: In function ‘sideband_msg_req_encode_decode’:
 drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c:168:1: warning: the frame size of 1072 bytes is larger than 1024 bytes [-Wframe-larger-than=]

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116174112.1833368-31-lee.jones@linaro.org

diff --git a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
index e00bdc5..6b4759e 100644 (file)
--- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
+++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
@@ -122,7 +122,7 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
 {
        struct drm_dp_sideband_msg_req_body *out;
        struct drm_printer p = drm_err_printer(PREFIX_STR);
-       struct drm_dp_sideband_msg_tx txmsg;
+       struct drm_dp_sideband_msg_tx *txmsg;
        int i, ret;
        bool result = true;
 
@@ -130,8 +130,12 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
        if (!out)
                return false;
 
-       drm_dp_encode_sideband_req(in, &txmsg);
-       ret = drm_dp_decode_sideband_req(&txmsg, out);
+       txmsg = kzalloc(sizeof(*txmsg), GFP_KERNEL);
+       if (!txmsg)
+               return false;
+
+       drm_dp_encode_sideband_req(in, txmsg);
+       ret = drm_dp_decode_sideband_req(txmsg, out);
        if (ret < 0) {
                drm_printf(&p, "Failed to decode sideband request: %d\n",
                           ret);
@@ -166,6 +170,7 @@ sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
 
 out:
        kfree(out);
+       kfree(txmsg);
        return result;
 }