From 3240a55ffbaf12b6e72cec6755fd6183f930298c Mon Sep 17 00:00:00 2001
From: David Schleef <ds@schleef.org>
Date: Fri, 8 Nov 2002 21:49:28 +0000
Subject: [PATCH] Add debugging

---
 comedi/comedi_fops.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/comedi/comedi_fops.c b/comedi/comedi_fops.c
index a575cb8e..410a314b 100644
--- a/comedi/comedi_fops.c
+++ b/comedi/comedi_fops.c
@@ -513,34 +513,41 @@ static int do_insnlist_ioctl(comedi_device *dev,void *arg,void *file)
 	if(copy_from_user(&insnlist,arg,sizeof(comedi_insnlist)))
 		return -EFAULT;
 
-	if(insnlist.n_insns>=MAX_INSNS)
+	if(insnlist.n_insns>=MAX_INSNS){
+		DPRINTK("insnlist too long\n");
 		return -EINVAL;
+	}
 
 	data=kmalloc(sizeof(lsampl_t)*MAX_SAMPLES,GFP_KERNEL);
 	if(!data){
+		DPRINTK("kmalloc failed\n");
 		ret = -ENOMEM;
 		goto error;
 	}
 
 	insns=kmalloc(sizeof(comedi_insn)*insnlist.n_insns,GFP_KERNEL);
 	if(!insns){
+		DPRINTK("kmalloc failed\n");
 		ret = -ENOMEM;
 		goto error;
 	}
 
 	if(copy_from_user(insns,insnlist.insns,sizeof(comedi_insn)*insnlist.n_insns)){
+		DPRINTK("copy_from_user failed\n");
 		ret=-EFAULT;
 		goto error;
 	}
 
 	for(i=0;i<insnlist.n_insns;i++){
 		if(insns[i].n>MAX_SAMPLES){
+			DPRINTK("number of samples too large\n");
 			ret=-EINVAL;
 			goto error;
 		}
 		if(insns[i].insn&INSN_MASK_WRITE){
 			if(copy_from_user(data,insns[i].data,
 					insns[i].n*sizeof(lsampl_t))){
+				DPRINTK("copy_from_user failed\n");
 				ret=-EFAULT;
 				goto error;
 			}
@@ -555,6 +562,7 @@ static int do_insnlist_ioctl(comedi_device *dev,void *arg,void *file)
 		if(insns[i].insn&INSN_MASK_READ){
 			if(copy_to_user(insns[i].data,data,
 					insns[i].n*sizeof(lsampl_t))){
+				DPRINTK("copy_to_user failed\n");
 				ret=-EFAULT;
 				goto error;
 			}
-- 
2.26.2