Warning from gcc: braces around scalar initializer, how to fix? - c

Question

At rewriting kernel driver I got this warning:
msm-cirrus-playback.c:545:2: warning: braces around scalar initializer
Read that this warning appears when I am declaring one structure's field in {}:
struct random_struct test = {
{ .name = "StackOverflow" },
{ .name = "StackExchange" },
};
But my structure have 2-3 fields in {}:
static struct device_attribute *opalum_dev_attr = {
{
.attr->name = "temp-acc",
.show = opsl_temp_acc_show,
.store = opsl_temp_acc_store,
},
{
.attr->name = "count",
.show = opsl_count_show,
.store = opsl_count_store,
},
{
.attr->name = "ambient",
.show = opsl_ambient_show,
.store = opsl_ambient_store,
},
{
.attr->name = "f0",
.show = opsl_f0_show,
.store = opsl_f0_store,
},
{
.attr->name = "pass",
.show = opsl_pass_show,
},
{
.attr->name = "start",
.show = opsl_cali_start,
},
};
This structure:
struct device_attribute {
struct attribute attr;
ssize_t (*show)(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t (*store)(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
};
How can I fix this warning? Qualcomm kernels are building with -Werror flag, so this warning is critical.

Answer 1

static struct device_attribute *opalum_dev_attr means declare opalum_dev_attr as static pointer to struct device_attribute
Your code is trying to initialize a static array of struct device_attribute
What you want is: static struct device_attribute opalum_dev_attr[] which means declare opalum_dev_attr as static array of struct device_attribute

Answer 2

It is because you initialize the pointer to the struct not the struct itself.
you need to assign the reference to the struct for example by using compound literals
struct x
{
int a,b,c;
}a = {1,2,3};
void foo()
{
struct x a = {1,2,3};
struct x *b = {1,2,3}; // wrong warning here
struct x *x = &(struct x){1,2,3}; // correct reference to the struct assigned (using compound literal
struct x *y = (struct x[]){{1,2,3}, {4,5,6}, {4,5,6}, };
struct x z[] = {{1,2,3}, {4,5,6}, {4,5,6}, };
}