Staging: batman-adv: don't lock while sending packets

As in other parts of batman-adv, we should not lock while sending a packet but
keep the lock held for as short as possible. Additionally, we should check
whether the interface is active, otherwise batman_if->net_dev might not be
available ...

Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Acked-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/staging/batman-adv/device.c b/drivers/staging/batman-adv/device.c
index a3e74296abf..451898cd9ec 100644
--- a/drivers/staging/batman-adv/device.c
+++ b/drivers/staging/batman-adv/device.c
@@ -25,6 +25,7 @@
 #include "send.h"
 #include "types.h"
 #include "hash.h"
+#include "hard-interface.h"
 
 static struct class *batman_class;
 
@@ -206,6 +207,7 @@ ssize_t bat_device_write(struct file *file, const char __user *buff,
         struct icmp_packet icmp_packet;
         struct orig_node *orig_node;
         struct batman_if *batman_if;
+        uint8_t dstaddr[ETH_ALEN];
         unsigned long flags;
 
         if (len < sizeof(struct icmp_packet)) {
@@ -251,9 +253,15 @@ ssize_t bat_device_write(struct file *file, const char __user *buff,
                 goto unlock;
 
         batman_if = orig_node->batman_if;
+        memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
+
+        spin_unlock_irqrestore(&orig_hash_lock, flags);
 
         if (!batman_if)
-                goto unlock;
+                goto dst_unreach;
+
+        if (batman_if->if_active != IF_ACTIVE)
+                goto dst_unreach;
 
         memcpy(icmp_packet.orig,
                batman_if->net_dev->dev_addr,
@@ -261,9 +269,8 @@ ssize_t bat_device_write(struct file *file, const char __user *buff,
 
         send_raw_packet((unsigned char *)&icmp_packet,
                         sizeof(struct icmp_packet),
-                        batman_if, orig_node->router->addr);
+                        batman_if, dstaddr);
 
-        spin_unlock_irqrestore(&orig_hash_lock, flags);
         goto out;
 
 unlock: