On 12/8/2017 4:11 AM, Lothar Waßmann wrote:
>> While implementing the ACPI piece, I have to convert an unsigned long to
>> (const void *) in ACPI code so that the APIs are compatible.
>>
> Just one more remark: Do you need write access to the data the pointer
> returned by device_get_match_data() or of_fwnode_get_match_data()
> points to?
> If not, the return type of those functions should be 'const void *'.
Yes, the only reason driver is trying to obtain this data pointer is to modify
members of it. I did a quick test with your suggestion.
test.c: In function ‘main’:
test.c:15:2: error: assignment of member ‘m’ in read-only object
t->m = 3;
^
struct test
{
int m;
};
int main(void)
{
const void *ptr;
unsigned long l =4;
const struct test *t;
ptr = (const void *)l;
t = ptr;
t->m = 3;
}
--
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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