[PATCH] Make netif_rx_ni preempt-safe

[Lee Revell <rlrevell@joe-job.com>]

This patch makes netif_rx_ni() preempt-safe.  The problem was reported
by Alain Schroeder.  Here are the users:

drivers/s390/net/ctcmain.c
drivers/s390/net/netiucv.c
drivers/net/irda/vlsi_ir.c
drivers/net/tun.c

As David S. Miller explained, the do_softirq (and therefore the preempt
dis/enable) is required because there is no softirq check on the return
path when netif_rx is called from non-interrupt context.

Signed-Off-By: Lee Revell <rlrevell@joe-job.com>

--- include/linux/netdevice.h~	2004-10-19 18:50:18.000000000 -0400
+++ include/linux/netdevice.h	2004-10-19 18:51:01.000000000 -0400
@@ -696,9 +696,11 @@
  */
 static inline int netif_rx_ni(struct sk_buff *skb)
 {
+       preempt_disable();
        int err = netif_rx(skb);
        if (softirq_pending(smp_processor_id()))
                do_softirq();
+       preempt_enable();
        return err;
 }