1 files changed, 11 insertions, 3 deletions

diff --git a/drivers/isdn/hardware/avm/c4.c b/drivers/isdn/hardware/avm/c4.c
index d58f927e766a..8710cf6214d9 100644
--- a/drivers/isdn/hardware/avm/c4.c
+++ b/drivers/isdn/hardware/avm/c4.c
@@ -727,6 +727,7 @@ static void c4_send_init(avmcard *card)
 {
         struct sk_buff *skb;
         void *p;
+        unsigned long flags;
 
         skb = alloc_skb(15, GFP_ATOMIC);
         if (!skb) {
@@ -744,12 +745,15 @@ static void c4_send_init(avmcard *card)
         skb_put(skb, (u8 *)p - (u8 *)skb->data);
 
         skb_queue_tail(&card->dma->send_queue, skb);
+        spin_lock_irqsave(&card->lock, flags);
         c4_dispatch_tx(card);
+        spin_unlock_irqrestore(&card->lock, flags);
 }
 
 static int queue_sendconfigword(avmcard *card, u32 val)
 {
         struct sk_buff *skb;
+        unsigned long flags;
         void *p;
 
         skb = alloc_skb(3+4, GFP_ATOMIC);
@@ -766,7 +770,9 @@ static int queue_sendconfigword(avmcard *card, u32 val)
         skb_put(skb, (u8 *)p - (u8 *)skb->data);
 
         skb_queue_tail(&card->dma->send_queue, skb);
+        spin_lock_irqsave(&card->lock, flags);
         c4_dispatch_tx(card);
+        spin_unlock_irqrestore(&card->lock, flags);
         return 0;
 }
 
@@ -986,7 +992,9 @@ static void c4_release_appl(struct capi_ctr *ctrl, u16 appl)
         struct sk_buff *skb;
         void *p;
 
+        spin_lock_irqsave(&card->lock, flags);
         capilib_release_appl(&cinfo->ncci_head, appl);
+        spin_unlock_irqrestore(&card->lock, flags);
 
         if (ctrl->cnr == card->cardnr) {
                 skb = alloc_skb(7, GFP_ATOMIC);
@@ -1019,7 +1027,8 @@ static u16 c4_send_message(struct capi_ctr *ctrl, struct sk_buff *skb)
         u16 retval = CAPI_NOERROR;
         unsigned long flags;
 
-        if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
+        spin_lock_irqsave(&card->lock, flags);
+        if (CAPIMSG_CMD(skb->data) == CAPI_DATA_B3_REQ) {
                 retval = capilib_data_b3_req(&cinfo->ncci_head,
                                              CAPIMSG_APPID(skb->data),
                                              CAPIMSG_NCCI(skb->data),
@@ -1027,10 +1036,9 @@ static u16 c4_send_message(struct capi_ctr *ctrl, struct sk_buff *skb)
         }
         if (retval == CAPI_NOERROR) {
                 skb_queue_tail(&card->dma->send_queue, skb);
-                spin_lock_irqsave(&card->lock, flags);
                 c4_dispatch_tx(card);
-                spin_unlock_irqrestore(&card->lock, flags);
         }
+        spin_unlock_irqrestore(&card->lock, flags);
         return retval;
 }