NET: Fix locking issues in PPP, 6pack, mkiss and strip line disciplines.

Guido Trentalancia reports:

I am trying to use the kiss driver in the Linux kernel that is being
shipped with Fedora 10 but unfortunately I get the following oops:

mkiss: AX.25 Multikiss, Hans Albas PE1AYX
mkiss: ax0: crc mode is auto.
ADDRCONF(NETDEV_CHANGE): ax0: link becomes ready
------------[ cut here ]------------
WARNING: at kernel/softirq.c:77 __local_bh_disable+0x2f/0x83() (Not
tainted)
[...]
unloaded: microcode]
Pid: 0, comm: swapper Not tainted 2.6.27.25-170.2.72.fc10.i686 #1
 [<c042ddfb>] warn_on_slowpath+0x65/0x8b
 [<c06ab62b>] ? _spin_unlock_irqrestore+0x22/0x38
 [<c04228b4>] ? __enqueue_entity+0xe3/0xeb
 [<c042431e>] ? enqueue_entity+0x203/0x20b
 [<c0424361>] ? enqueue_task_fair+0x3b/0x3f
 [<c041f88c>] ? resched_task+0x3a/0x6e
 [<c06ab62b>] ? _spin_unlock_irqrestore+0x22/0x38
 [<c06ab4e2>] ? _spin_lock_bh+0xb/0x16
 [<c043255b>] __local_bh_disable+0x2f/0x83
 [<c04325ba>] local_bh_disable+0xb/0xd
 [<c06ab4e2>] _spin_lock_bh+0xb/0x16
 [<f8b6f600>] mkiss_receive_buf+0x2fb/0x3a6 [mkiss]
 [<c0572a30>] flush_to_ldisc+0xf7/0x198
 [<c0572b12>] tty_flip_buffer_push+0x41/0x51
 [<f89477f2>] ftdi_process_read+0x375/0x4ad [ftdi_sio]
 [<f8947a5a>] ftdi_read_bulk_callback+0x130/0x138 [ftdi_sio]
 [<c05d4bec>] usb_hcd_giveback_urb+0x63/0x93
 [<c05ea290>] uhci_giveback_urb+0xe5/0x15f
 [<c05eaabf>] uhci_scan_schedule+0x52e/0x767
 [<c05f6288>] ? psmouse_handle_byte+0xc/0xe5
 [<c054df78>] ? acpi_ev_gpe_detect+0xd6/0xe1
 [<c05ec5b0>] uhci_irq+0x110/0x125
 [<c05d4834>] usb_hcd_irq+0x40/0xa3
 [<c0465313>] handle_IRQ_event+0x2f/0x64
 [<c046642b>] handle_level_irq+0x74/0xbe
 [<c04663b7>] ? handle_level_irq+0x0/0xbe
 [<c0406e6e>] do_IRQ+0xc7/0xfe
 [<c0405668>] common_interrupt+0x28/0x30
 [<c056821a>] ? acpi_idle_enter_simple+0x162/0x19d
 [<c0617f52>] cpuidle_idle_call+0x60/0x92
 [<c0403c61>] cpu_idle+0x101/0x134
 [<c069b1ba>] rest_init+0x4e/0x50
 =======================
---[ end trace b7cc8076093467ad ]---
------------[ cut here ]------------
WARNING: at kernel/softirq.c:136 _local_bh_enable_ip+0x3d/0xc4()
[...]
Pid: 0, comm: swapper Tainted: G        W 2.6.27.25-170.2.72.fc10.i686
 [<c042ddfb>] warn_on_slowpath+0x65/0x8b
 [<c06ab62b>] ? _spin_unlock_irqrestore+0x22/0x38
 [<c04228b4>] ? __enqueue_entity+0xe3/0xeb
 [<c042431e>] ? enqueue_entity+0x203/0x20b
 [<c0424361>] ? enqueue_task_fair+0x3b/0x3f
 [<c041f88c>] ? resched_task+0x3a/0x6e
 [<c06ab62b>] ? _spin_unlock_irqrestore+0x22/0x38
 [<c06ab4e2>] ? _spin_lock_bh+0xb/0x16
 [<f8b6f642>] ? mkiss_receive_buf+0x33d/0x3a6 [mkiss]
 [<c04325f9>] _local_bh_enable_ip+0x3d/0xc4
 [<c0432688>] local_bh_enable_ip+0x8/0xa
 [<c06ab54d>] _spin_unlock_bh+0x11/0x13
 [<f8b6f642>] mkiss_receive_buf+0x33d/0x3a6 [mkiss]
 [<c0572a30>] flush_to_ldisc+0xf7/0x198
 [<c0572b12>] tty_flip_buffer_push+0x41/0x51
 [<f89477f2>] ftdi_process_read+0x375/0x4ad [ftdi_sio]
 [<f8947a5a>] ftdi_read_bulk_callback+0x130/0x138 [ftdi_sio]
 [<c05d4bec>] usb_hcd_giveback_urb+0x63/0x93
 [<c05ea290>] uhci_giveback_urb+0xe5/0x15f
 [<c05eaabf>] uhci_scan_schedule+0x52e/0x767
 [<c05f6288>] ? psmouse_handle_byte+0xc/0xe5
 [<c054df78>] ? acpi_ev_gpe_detect+0xd6/0xe1
 [<c05ec5b0>] uhci_irq+0x110/0x125
 [<c05d4834>] usb_hcd_irq+0x40/0xa3
 [<c0465313>] handle_IRQ_event+0x2f/0x64
 [<c046642b>] handle_level_irq+0x74/0xbe
 [<c04663b7>] ? handle_level_irq+0x0/0xbe
 [<c0406e6e>] do_IRQ+0xc7/0xfe
 [<c0405668>] common_interrupt+0x28/0x30
 [<c056821a>] ? acpi_idle_enter_simple+0x162/0x19d
 [<c0617f52>] cpuidle_idle_call+0x60/0x92
 [<c0403c61>] cpu_idle+0x101/0x134
 [<c069b1ba>] rest_init+0x4e/0x50
 =======================
---[ end trace b7cc8076093467ad ]---
mkiss: ax0: Trying crc-smack
mkiss: ax0: Trying crc-flexnet

The issue was, that the locking code in mkiss was assuming it was only
ever being called in process or bh context.  Fixed by converting the
involved locking code to use irq-safe locks.

Review of other networking line disciplines shows that 6pack, both sync
and async PPP and STRIP have similar issues.  The ppp_async one is the
most interesting one as it sorts out half of the issue as far back as
2004 in commit http://git.kernel.org/?p=linux/kernel/git/tglx/history.git;a=commitdiff;h=2996d8deaeddd01820691a872550dc0cfba0c37d

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Reported-by: Guido Trentalancia <guido@trentalancia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 24 insertions, 15 deletions

diff --git a/drivers/net/wireless/strip.c b/drivers/net/wireless/strip.c
index 38366a56b71..3d39f6587eb 100644
--- a/drivers/net/wireless/strip.c
+++ b/drivers/net/wireless/strip.c
@@ -856,6 +856,7 @@ static int strip_change_mtu(struct net_device *dev, int new_mtu)
         unsigned char *orbuff = strip_info->rx_buff;
         unsigned char *osbuff = strip_info->sx_buff;
         unsigned char *otbuff = strip_info->tx_buff;
+        unsigned long flags;
 
         if (new_mtu > MAX_SEND_MTU) {
                 printk(KERN_ERR
@@ -864,11 +865,11 @@ static int strip_change_mtu(struct net_device *dev, int new_mtu)
                 return -EINVAL;
         }
 
-        spin_lock_bh(&strip_lock);
+        spin_lock_irqsave(&strip_lock, flags);
         if (!allocate_buffers(strip_info, new_mtu)) {
                 printk(KERN_ERR "%s: unable to grow strip buffers, MTU change cancelled.\n",
                        strip_info->dev->name);
-                spin_unlock_bh(&strip_lock);
+                spin_unlock_irqrestore(&strip_lock, flags);
                 return -ENOMEM;
         }
 
@@ -892,7 +893,7 @@ static int strip_change_mtu(struct net_device *dev, int new_mtu)
                 }
         }
         strip_info->tx_head = strip_info->tx_buff;
-        spin_unlock_bh(&strip_lock);
+        spin_unlock_irqrestore(&strip_lock, flags);
 
         printk(KERN_NOTICE "%s: strip MTU changed fom %d to %d.\n",
                strip_info->dev->name, old_mtu, strip_info->mtu);
@@ -983,10 +984,13 @@ static void strip_seq_neighbours(struct seq_file *seq,
                            const MetricomNodeTable * table,
                            const char *title)
 {
-        /* We wrap this in a do/while loop, so if the table changes */
-        /* while we're reading it, we just go around and try again. */
+        unsigned long flags;
         struct timeval t;
 
+        /*
+         * We wrap this in a do/while loop, so if the table changes
+         * while we're reading it, we just go around and try again.
+         */
         do {
                 int i;
                 t = table->timestamp;
@@ -995,9 +999,9 @@ static void strip_seq_neighbours(struct seq_file *seq,
                 for (i = 0; i < table->num_nodes; i++) {
                         MetricomNode node;
 
-                        spin_lock_bh(&strip_lock);
+                        spin_lock_irqsave(&strip_lock, flags);
                         node = table->node[i];
-                        spin_unlock_bh(&strip_lock);
+                        spin_unlock_irqrestore(&strip_lock, flags);
                         seq_printf(seq, "  %s\n", node.c);
                 }
         } while (table->timestamp.tv_sec != t.tv_sec
@@ -1536,6 +1540,7 @@ static void strip_send(struct strip *strip_info, struct sk_buff *skb)
 static int strip_xmit(struct sk_buff *skb, struct net_device *dev)
 {
         struct strip *strip_info = netdev_priv(dev);
+        unsigned long flags;
 
         if (!netif_running(dev)) {
                 printk(KERN_ERR "%s: xmit call when iface is down\n",
@@ -1574,11 +1579,11 @@ static int strip_xmit(struct sk_buff *skb, struct net_device *dev)
                                strip_info->dev->name, sx_pps_count / 8);
         }
 
-        spin_lock_bh(&strip_lock);
+        spin_lock_irqsave(&strip_lock, flags);
 
         strip_send(strip_info, skb);
 
-        spin_unlock_bh(&strip_lock);
+        spin_unlock_irqrestore(&strip_lock, flags);
 
         if (skb)
                 dev_kfree_skb(skb);
@@ -2263,12 +2268,13 @@ static void strip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
 {
         struct strip *strip_info = tty->disc_data;
         const unsigned char *end = cp + count;
+        unsigned long flags;
 
         if (!strip_info || strip_info->magic != STRIP_MAGIC
             || !netif_running(strip_info->dev))
                 return;
 
-        spin_lock_bh(&strip_lock);
+        spin_lock_irqsave(&strip_lock, flags);
 #if 0
         {
                 struct timeval tv;
@@ -2335,7 +2341,7 @@ static void strip_receive_buf(struct tty_struct *tty, const unsigned char *cp,
                 }
                 cp++;
         }
-        spin_unlock_bh(&strip_lock);
+        spin_unlock_irqrestore(&strip_lock, flags);
 }
 
 
@@ -2523,9 +2529,11 @@ static void strip_dev_setup(struct net_device *dev)
 
 static void strip_free(struct strip *strip_info)
 {
-        spin_lock_bh(&strip_lock);
+        unsigned long flags;
+
+        spin_lock_irqsave(&strip_lock, flags);
         list_del_rcu(&strip_info->list);
-        spin_unlock_bh(&strip_lock);
+        spin_unlock_irqrestore(&strip_lock, flags);
 
         strip_info->magic = 0;
 
@@ -2539,6 +2547,7 @@ static void strip_free(struct strip *strip_info)
 static struct strip *strip_alloc(void)
 {
         struct list_head *n;
+        unsigned long flags;
         struct net_device *dev;
         struct strip *strip_info;
 
@@ -2562,7 +2571,7 @@ static struct strip *strip_alloc(void)
         strip_info->idle_timer.function = strip_IdleTask;
 
 
-        spin_lock_bh(&strip_lock);
+        spin_lock_irqsave(&strip_lock, flags);
  rescan:
         /*
          * Search the list to find where to put our new entry
@@ -2581,7 +2590,7 @@ static struct strip *strip_alloc(void)
         sprintf(dev->name, "st%ld", dev->base_addr);
 
         list_add_tail_rcu(&strip_info->list, &strip_list);
-        spin_unlock_bh(&strip_lock);
+        spin_unlock_irqrestore(&strip_lock, flags);
 
         return strip_info;
 }