[PATCH] ASoC: SOF: topology: Use struct_size() helper

[Gustavo A. R. Silva]

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes, in particular in the
context in which this code is being used.

So, replace the following form:

sizeof(struct sof_ipc_ctrl_data) + sizeof(struct sof_ipc_ctrl_value_chan) *
        le32_to_cpu(mc->num_channels)

with:

struct_size(scontrol->control_data, chanv, le32_to_cpu(mc->num_channels))

and so on...

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
 sound/soc/sof/topology.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/sound/soc/sof/topology.c b/sound/soc/sof/topology.c
index c88afa872a58..745cb875863c 100644
--- a/sound/soc/sof/topology.c
+++ b/sound/soc/sof/topology.c
@@ -442,9 +442,8 @@ static int sof_control_load_volume(struct snd_soc_component 
*scomp,
                return -EINVAL;
 
        /* init the volume get/put data */
-       scontrol->size = sizeof(struct sof_ipc_ctrl_data) +
-                        sizeof(struct sof_ipc_ctrl_value_chan) *
-                        le32_to_cpu(mc->num_channels);
+       scontrol->size = struct_size(scontrol->control_data, chanv,
+                                    le32_to_cpu(mc->num_channels));
        scontrol->control_data = kzalloc(scontrol->size, GFP_KERNEL);
        if (!scontrol->control_data)
                return -ENOMEM;
@@ -501,9 +500,8 @@ static int sof_control_load_enum(struct snd_soc_component 
*scomp,
                return -EINVAL;
 
        /* init the enum get/put data */
-       scontrol->size = sizeof(struct sof_ipc_ctrl_data) +
-                        sizeof(struct sof_ipc_ctrl_value_chan) *
-                        le32_to_cpu(ec->num_channels);
+       scontrol->size = struct_size(scontrol->control_data, chanv,
+                                    le32_to_cpu(ec->num_channels));
        scontrol->control_data = kzalloc(scontrol->size, GFP_KERNEL);
        if (!scontrol->control_data)
                return -ENOMEM;
-- 
2.21.0