mISDN: Make clearing B-channel a common function

Clearing B-channel is needed in every driver, so it makes sense
to have it as common function.
Signed-off-by: Karsten Keil <keil@b1-systems.de>

drivers/isdn/hardware/mISDN/hfcmulti.c

@@ -3416,22 +3416,8 @@ deactivate_bchannel(struct bchannel *bch)
 	u_long			flags;
 
 	spin_lock_irqsave(&hc->lock, flags);
-	if (test_and_clear_bit(FLG_TX_NEXT, &bch->Flags)) {
-		dev_kfree_skb(bch->next_skb);
-		bch->next_skb = NULL;
-	}
-	if (bch->tx_skb) {
-		dev_kfree_skb(bch->tx_skb);
-		bch->tx_skb = NULL;
-	}
-	bch->tx_idx = 0;
-	if (bch->rx_skb) {
-		dev_kfree_skb(bch->rx_skb);
-		bch->rx_skb = NULL;
-	}
+	mISDN_clear_bchannel(bch);
 	hc->chan[bch->slot].coeff_count = 0;
-	test_and_clear_bit(FLG_ACTIVE, &bch->Flags);
-	test_and_clear_bit(FLG_TX_BUSY, &bch->Flags);
 	hc->chan[bch->slot].rx_off = 0;
 	hc->chan[bch->slot].conf = -1;
 	mode_hfcmulti(hc, bch->slot, ISDN_P_NONE, -1, 0, -1, 0);

drivers/isdn/hardware/mISDN/hfcpci.c

@@ -1522,22 +1522,8 @@ deactivate_bchannel(struct bchannel *bch)
 	u_long		flags;
 
 	spin_lock_irqsave(&hc->lock, flags);
-	if (test_and_clear_bit(FLG_TX_NEXT, &bch->Flags)) {
-		dev_kfree_skb(bch->next_skb);
-		bch->next_skb = NULL;
-	}
-	if (bch->tx_skb) {
-		dev_kfree_skb(bch->tx_skb);
-		bch->tx_skb = NULL;
-	}
-	bch->tx_idx = 0;
-	if (bch->rx_skb) {
-		dev_kfree_skb(bch->rx_skb);
-		bch->rx_skb = NULL;
-	}
+	mISDN_clear_bchannel(bch);
 	mode_hfcpci(bch, bch->nr, ISDN_P_NONE);
-	test_and_clear_bit(FLG_ACTIVE, &bch->Flags);
-	test_and_clear_bit(FLG_TX_BUSY, &bch->Flags);
 	spin_unlock_irqrestore(&hc->lock, flags);
 }
 

drivers/isdn/hardware/mISDN/hfcsusb.c

@@ -1809,21 +1809,7 @@ deactivate_bchannel(struct bchannel *bch)
 		    hw->name, __func__, bch->nr);
 
 	spin_lock_irqsave(&hw->lock, flags);
-	if (test_and_clear_bit(FLG_TX_NEXT, &bch->Flags)) {
-		dev_kfree_skb(bch->next_skb);
-		bch->next_skb = NULL;
-	}
-	if (bch->tx_skb) {
-		dev_kfree_skb(bch->tx_skb);
-		bch->tx_skb = NULL;
-	}
-	bch->tx_idx = 0;
-	if (bch->rx_skb) {
-		dev_kfree_skb(bch->rx_skb);
-		bch->rx_skb = NULL;
-	}
-	clear_bit(FLG_ACTIVE, &bch->Flags);
-	clear_bit(FLG_TX_BUSY, &bch->Flags);
+	mISDN_clear_bchannel(bch);
 	spin_unlock_irqrestore(&hw->lock, flags);
 	hfcsusb_setup_bch(bch, ISDN_P_NONE);
 	hfcsusb_stop_endpoint(hw, bch->nr);

drivers/isdn/mISDN/hwchannel.c

@@ -114,13 +114,14 @@ mISDN_freedchannel(struct dchannel *ch)
 }
 EXPORT_SYMBOL(mISDN_freedchannel);
 
-int
-mISDN_freebchannel(struct bchannel *ch)
+void
+mISDN_clear_bchannel(struct bchannel *ch)
 {
 	if (ch->tx_skb) {
 		dev_kfree_skb(ch->tx_skb);
 		ch->tx_skb = NULL;
 	}
+	ch->tx_idx = 0;
 	if (ch->rx_skb) {
 		dev_kfree_skb(ch->rx_skb);
 		ch->rx_skb = NULL;
@@ -129,6 +130,16 @@ mISDN_freebchannel(struct bchannel *ch)
 		dev_kfree_skb(ch->next_skb);
 		ch->next_skb = NULL;
 	}
+	test_and_clear_bit(FLG_TX_BUSY, &ch->Flags);
+	test_and_clear_bit(FLG_TX_NEXT, &ch->Flags);
+	test_and_clear_bit(FLG_ACTIVE, &ch->Flags);
+}
+EXPORT_SYMBOL(mISDN_clear_bchannel);
+
+int
+mISDN_freebchannel(struct bchannel *ch)
+{
+	mISDN_clear_bchannel(ch);
 	skb_queue_purge(&ch->rqueue);
 	ch->rcount = 0;
 	flush_scheduled_work();

include/linux/mISDNhw.h

@@ -168,6 +168,7 @@ struct bchannel {
 extern int	mISDN_initdchannel(struct dchannel *, int, void *);
 extern int	mISDN_initbchannel(struct bchannel *, int);
 extern int	mISDN_freedchannel(struct dchannel *);
+extern void	mISDN_clear_bchannel(struct bchannel *);
 extern int	mISDN_freebchannel(struct bchannel *);
 extern void	queue_ch_frame(struct mISDNchannel *, u_int,
 			int, struct sk_buff *);