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Message-ID: <2dad68f011c7cd8a7c3754457c192f9dc2f504ed.camel@redhat.com>
Date: Mon, 16 Nov 2020 15:53:37 -0500
From: Lyude Paul <lyude@...hat.com>
To: Lee Jones <lee.jones@...aro.org>
Cc: linux-kernel@...r.kernel.org, David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
David Francis <David.Francis@....com>,
dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH 29/42] drm/selftests/test-drm_dp_mst_helper: Place
'struct drm_dp_sideband_msg_req_body' onto the heap
Huh-could have sworn I had reviewed this one already.
Reviewed-by: Lyude Paul <lyude@...hat.com>
On Mon, 2020-11-16 at 17:40 +0000, Lee Jones wrote:
> 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@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Lyude Paul <lyude@...hat.com>
> Cc: David Francis <David.Francis@....com>
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
> .../drm/selftests/test-drm_dp_mst_helper.c | 31 ++++++++++++-------
> 1 file changed, 20 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..e00bdc557f880 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 +120,53 @@ 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);
> + if (!out)
> + return false;
>
> 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)
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
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