2.6.10-rc3-mm1 FIONREAD breakge

[Stephen Hemminger <shemminger@xxxxxxxx>]

Latest -mm kernel broke FIONREAD on UDP sockets. This stopped STP in it's tracks
because then names don't resolve.

The following works on 2.6.10-rc3 but breaks on 2.6.10-rc3-mm1
=====================================
/* Did FIONREAD break on UDP? */
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <arpa/inet.h>

int main(int argc, char **argv)
{
        int s;
        static struct sockaddr_in sin = { AF_INET };
        int len;

        s = socket(AF_INET, SOCK_DGRAM, 0);
        if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) < 0) 
                perror("bind");

        len = sizeof(sin);
        getsockname(s, (struct sockaddr *) &sin, &len);
        printf("Bound to %s.%d\n", 
               inet_ntoa(sin.sin_addr), ntohs(sin.sin_port));
        for(;;) {
                unsigned long count;
                fflush(stdout);
                if (ioctl(s, FIONREAD, &count) < 0)
                        perror("ioctl(FIONREAD)");

                printf("nread = %ld\n", count);
                sleep(5);
        }
}