Add debugging

diff --git a/comedi/comedi_fops.c b/comedi/comedi_fops.c
index a575cb8eb9cf2e81b4d969d79ee3d772fef853d1..410a314b391dc162cf6dec47ff6162f3aa756a9d 100644 (file)
--- 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;
                        }