Freeing Volatile Pointer

[Tejas Sumant]

Hi,

I have a volatile pointer declared in my device driver.
I am allocating memory using kernel malloc function.

host_mem_resp_ptr = (volatile unsigned long *)malloc(sizeof(volatile
unsigned long), M_DEVBUF, M_NOWAIT);

When I try to free it, I get following warning while compiling the driver.

"warning: passing arg 1 of free discards qualifiers from pointer target
type"

The statment to free the memory is

free(host_mem_resp_ptr, M_DEVBUF);

Can anybody please tell me reason and solution?

Tejas