[TOKENRING]: Use interrupt-safe locking with rif_lock.

Change operations on rif_lock from spin_{un}lock_bh to
spin_{un}lock_irq{save,restore} equivalents.  Some of the
rif_lock critical sections are called from interrupt context via
tr_type_trans->tr_add_rif_info.  The TR NIC drivers call tr_type_trans
from their packet receive handlers.

Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 10 deletions

diff --git a/net/802/tr.c b/net/802/tr.c
index a755e880f4ba..1bb7dc1b85cd 100644
--- a/net/802/tr.c
+++ b/net/802/tr.c
@@ -251,10 +251,11 @@ void tr_source_route(struct sk_buff *skb,struct trh_hdr *trh,struct net_device *
         unsigned int hash;
         struct rif_cache *entry;
         unsigned char *olddata;
+        unsigned long flags;
         static const unsigned char mcast_func_addr[] 
                 = {0xC0,0x00,0x00,0x04,0x00,0x00};
         
-        spin_lock_bh(&rif_lock);
+        spin_lock_irqsave(&rif_lock, flags);
 
         /*
          *      Broadcasts are single route as stated in RFC 1042 
@@ -323,7 +324,7 @@ printk("source routing for %02X:%02X:%02X:%02X:%02X:%02X\n",trh->daddr[0],
         else 
                 slack = 18 - ((ntohs(trh->rcf) & TR_RCF_LEN_MASK)>>8);
         olddata = skb->data;
-        spin_unlock_bh(&rif_lock);
+        spin_unlock_irqrestore(&rif_lock, flags);
 
         skb_pull(skb, slack);
         memmove(skb->data, olddata, sizeof(struct trh_hdr) - slack);
@@ -337,10 +338,11 @@ printk("source routing for %02X:%02X:%02X:%02X:%02X:%02X\n",trh->daddr[0],
 static void tr_add_rif_info(struct trh_hdr *trh, struct net_device *dev)
 {
         unsigned int hash, rii_p = 0;
+        unsigned long flags;
         struct rif_cache *entry;
 
 
-        spin_lock_bh(&rif_lock);
+        spin_lock_irqsave(&rif_lock, flags);
         
         /*
          *      Firstly see if the entry exists
@@ -378,7 +380,7 @@ printk("adding rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
                 if(!entry) 
                 {
                         printk(KERN_DEBUG "tr.c: Couldn't malloc rif cache entry !\n");
-                        spin_unlock_bh(&rif_lock);
+                        spin_unlock_irqrestore(&rif_lock, flags);
                         return;
                 }
 
@@ -420,7 +422,7 @@ printk("updating rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
                     }                                         
                 entry->last_used=jiffies;               
         }
-        spin_unlock_bh(&rif_lock);
+        spin_unlock_irqrestore(&rif_lock, flags);
 }
 
 /*
@@ -430,9 +432,9 @@ printk("updating rif_entry: addr:%02X:%02X:%02X:%02X:%02X:%02X rcf:%04X\n",
 static void rif_check_expire(unsigned long dummy) 
 {
         int i;
-        unsigned long next_interval = jiffies + sysctl_tr_rif_timeout/2;
+        unsigned long flags, next_interval = jiffies + sysctl_tr_rif_timeout/2;
 
-        spin_lock_bh(&rif_lock);
+        spin_lock_irqsave(&rif_lock, flags);
         
         for(i =0; i < RIF_TABLE_SIZE; i++) {
                 struct rif_cache *entry, **pentry;
@@ -454,7 +456,7 @@ static void rif_check_expire(unsigned long dummy)
                 }
         }
         
-        spin_unlock_bh(&rif_lock);
+        spin_unlock_irqrestore(&rif_lock, flags);
 
         mod_timer(&rif_timer, next_interval);
 
@@ -485,7 +487,7 @@ static struct rif_cache *rif_get_idx(loff_t pos)
 
 static void *rif_seq_start(struct seq_file *seq, loff_t *pos)
 {
-        spin_lock_bh(&rif_lock);
+        spin_lock_irq(&rif_lock);
 
         return *pos ? rif_get_idx(*pos - 1) : SEQ_START_TOKEN;
 }
@@ -516,7 +518,7 @@ static void *rif_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 
 static void rif_seq_stop(struct seq_file *seq, void *v)
 {
-        spin_unlock_bh(&rif_lock);
+        spin_unlock_irq(&rif_lock);
 }
 
 static int rif_seq_show(struct seq_file *seq, void *v)