[PATCH 14/19] gpu: drm: selftests: test-drm_dp_mst_helper: Place 'struct drm_dp_sideband_msg_req_body' onto the heap

Lee Jones
2020-11-05T14:55:00Z

The stack is too full.

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:161:1: warning: the frame size of 1176 bytes is larger than 1024 bytes [-Wframe-larger-than=]

Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Lyude Paul <lyude@redhat.com>
Cc: David Francis <David.Francis@amd.com>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
.../drm/selftests/test-drm_dp_mst_helper.c | 29 ++++++++++++-------
1 file changed, 18 insertions(+), 11 deletions(-)

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 1d696ec001cff..0a539456f6864 100644
--- a/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
+++ b/drivers/gpu/drm/selftests/test-drm_dp_mst_helper.c
@@ -120,44 +120,51 @@ sideband_msg_req_equal(const struct drm_dp_sideband_msg_req_body *in,
static bool
sideband_msg_req_encode_decode(struct drm_dp_sideband_msg_req_body *in)
{
- struct drm_dp_sideband_msg_req_body out = {0};
+ struct drm_dp_sideband_msg_req_body *out;
struct drm_printer p = drm_err_printer(PREFIX_STR);
struct drm_dp_sideband_msg_tx txmsg;
int i, ret;
+ bool result = true;
+
+ out = kzalloc(sizeof(*out), GFP_KERNEL);

drm_dp_encode_sideband_req(in, &txmsg);
- ret = drm_dp_decode_sideband_req(&txmsg, &out);
+ ret = drm_dp_decode_sideband_req(&txmsg, out);
if (ret < 0) {
drm_printf(&p, "Failed to decode sideband request: %d\n",
ret);
- return false;
+ result = false;
+ goto out;
}

- if (!sideband_msg_req_equal(in, &out)) {
+ if (!sideband_msg_req_equal(in, out)) {
drm_printf(&p, "Encode/decode failed, expected:\n");
drm_dp_dump_sideband_msg_req_body(in, 1, &p);
drm_printf(&p, "Got:\n");
- drm_dp_dump_sideband_msg_req_body(&out, 1, &p);
- return false;
+ drm_dp_dump_sideband_msg_req_body(out, 1, &p);
+ result = false;
+ goto out;
}

switch (in->req_type) {
case DP_REMOTE_DPCD_WRITE:
- kfree(out.u.dpcd_write.bytes);
+ kfree(out->u.dpcd_write.bytes);
break;
case DP_REMOTE_I2C_READ:
- for (i = 0; i < out.u.i2c_read.num_transactions; i++)
- kfree(out.u.i2c_read.transactions[i].bytes);
+ for (i = 0; i < out->u.i2c_read.num_transactions; i++)
+ kfree(out->u.i2c_read.transactions[i].bytes);
break;
case DP_REMOTE_I2C_WRITE:
- kfree(out.u.i2c_write.bytes);
+ kfree(out->u.i2c_write.bytes);
break;
}

/* Clear everything but the req_type for the input */
memset(&in->u, 0, sizeof(in->u));

- return true;
+out:
+ kfree(out);
+ return result;
}

int igt_dp_mst_sideband_msg_req_decode(void *unused)
--
2.25.1