this code is used to initialize the attribute .and creating the file.
struct device_attribute * attr;
if(i=device_register(dev))
return i;
attr=(struct device_attribute*)kmalloc(sizeof(struct
device_attribute),GFP_KERNEL);
if(NULL ==attr)
{
printk(KERN_ERR"Out of memory at %s",__FUNCTION__);
device_unregister(dev);
return FALSE;
}
memset(attr,0,sizeof(struct device_attribute));
attr->attr.name="add_target";
attr->attr.mode= S_IRUGO | S_IWUSR;
attr->attr.owner=THIS_MODULE;
attr->show=add_target_show;
attr->store=add_target_store;
to_vt_host_info(dev)->add_target=attr;
device_create_file(dev ,to_vt_host_info(dev)->add_target);
/* ... */
the show function is :
static ssize_t add_target_show(struct device * dev, char * buf)
{
struct vt_host_info *vthost=to_vt_host_info(dev);
return(sprintf(buf, "%d\n", vthost->no_target));
}
When ever i cat the add_target file in/sys directory it doesnt
displays anything.
After this when i remove the module kernel panics:(.If i dont cat the
add_target_file it doesnot gives me a panic on rmmod.
Can anybody give me any pointers?
thank you
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