diff --git a/drivers/isdn/hardware/mISDN/hfcmulti.c b/drivers/isdn/hardware/mISDN/hfcmulti.c
index 97f4708b38795fe030fc6e92d3004697edc44c9b..595ba8eb4a07a2f534eb387f82d425d79ea0ee29 100644
--- a/drivers/isdn/hardware/mISDN/hfcmulti.c
+++ b/drivers/isdn/hardware/mISDN/hfcmulti.c
@@ -3615,7 +3615,7 @@ hfcm_bctrl(struct mISDNchannel *ch, u_int cmd, void *arg)
 static void
 ph_state_change(struct dchannel *dch)
 {
-	struct hfc_multi *hc = dch->hw;
+	struct hfc_multi *hc;
 	int ch, i;
 
 	if (!dch) {
@@ -3623,6 +3623,7 @@ ph_state_change(struct dchannel *dch)
 		    __func__);
 		return;
 	}
+	hc = dch->hw;
 	ch = dch->slot;
 
 	if (hc->type == 1) {
diff --git a/drivers/isdn/hardware/mISDN/hfcpci.c b/drivers/isdn/hardware/mISDN/hfcpci.c
index 917bf41a293b2324596e4c0ec13853704aaacf79..f0e14dfcf71da0054181547d5c976d2e546ce633 100644
--- a/drivers/isdn/hardware/mISDN/hfcpci.c
+++ b/drivers/isdn/hardware/mISDN/hfcpci.c
@@ -61,7 +61,7 @@ u32	hfc_jiffies;
 
 MODULE_AUTHOR("Karsten Keil");
 MODULE_LICENSE("GPL");
-module_param(debug, uint, 0);
+module_param(debug, uint, S_IRUGO | S_IWUSR);
 module_param(poll, uint, S_IRUGO | S_IWUSR);
 
 enum {
diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c
index 0ac67bff303a7cfbe92408f84d2bec4d4ddb29a9..58c43e429f73229ad6938ce83a9a3e336f4a62b3 100644
--- a/drivers/isdn/mISDN/dsp_cmx.c
+++ b/drivers/isdn/mISDN/dsp_cmx.c
@@ -1579,7 +1579,7 @@ dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
 	schedule_work(&dsp->workq);
 }
 
-static u32	jittercount; /* counter for jitter check */;
+static u32	jittercount; /* counter for jitter check */
 struct timer_list dsp_spl_tl;
 u32	dsp_spl_jiffies; /* calculate the next time to fire */
 static u16	dsp_count; /* last sample count */
@@ -1893,7 +1893,7 @@ dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb)
 		/* in case of hardware (echo) */
 		if (dsp->pcm_slot_tx >= 0)
 			return;
-		if (dsp->echo)
+		if (dsp->echo) {
 			nskb = skb_clone(skb, GFP_ATOMIC);
 			if (nskb) {
 				hh = mISDN_HEAD_P(nskb);
@@ -1902,6 +1902,7 @@ dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb)
 				skb_queue_tail(&dsp->sendq, nskb);
 				schedule_work(&dsp->workq);
 			}
+		}
 		return;
 	}
 	/* in case of hardware conference */
diff --git a/drivers/isdn/mISDN/dsp_pipeline.c b/drivers/isdn/mISDN/dsp_pipeline.c
index bf999bdc41c3e87df4a670738b81b90b215c1c97..18cf87c113e725cb9f7adc157963bb0105e3d5ea 100644
--- a/drivers/isdn/mISDN/dsp_pipeline.c
+++ b/drivers/isdn/mISDN/dsp_pipeline.c
@@ -110,8 +110,7 @@ int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
 	}
 	list_add_tail(&entry->list, &dsp_elements);
 
-	for (i = 0; i < (sizeof(element_attributes)
-		/ sizeof(struct device_attribute)); ++i)
+	for (i = 0; i < ARRAY_SIZE(element_attributes); ++i) {
 		ret = device_create_file(&entry->dev,
 				&element_attributes[i]);
 		if (ret) {
@@ -119,6 +118,7 @@ int mISDN_dsp_element_register(struct mISDN_dsp_element *elem)
 				__func__);
 			goto err2;
 		}
+	}
 
 #ifdef PIPELINE_DEBUG
 	printk(KERN_DEBUG "%s: %s registered\n", __func__, elem->name);
diff --git a/include/linux/mISDNif.h b/include/linux/mISDNif.h
index 557477ac3d5b509969060d748173626efddfe873..5da3d95b27f1612b7b008c3495caf419a089be06 100644
--- a/include/linux/mISDNif.h
+++ b/include/linux/mISDNif.h
@@ -559,7 +559,10 @@ extern void	mISDN_unregister_clock(struct mISDNclock *);
 
 static inline struct mISDNdevice *dev_to_mISDN(struct device *dev)
 {
-	return dev_get_drvdata(dev);
+	if (dev)
+		return dev_get_drvdata(dev);
+	else
+		return NULL;
 }
 
 extern void	set_channel_address(struct mISDNchannel *, u_int, u_int);