> int skull_open(struct inode * inode, struct file * filp)
> {
> int i;
> loff_t *bil;
> Dev *dev;
> const char *buf;
> printk("Major Number =>%d\n",inode->i_rdev >> 8);
> printk("Minor Number =>%d\n",inode->i_rdev & 0xff);
>
> filp->f_op = &f_ops;
>
> sema_init(&dev->sem, 1);
>
there is nothing in filp->private_data at this point. So you are pointing
your dev pointer off into nowhere. You should probably do something like:
dev = kmalloc( sizeof( struct Dev ), GFP_KERNEL );
filp->private_data = ( Dev * )( dev );
And then continue on.
> dev = (Dev *)filp->private_data;
>
> /* the problem is below */
>
> if((filp->f_flags & O_ACCMODE) == O_WRONLY) {
> down_interruptible(&dev->sem);
> up(&dev->sem);
>
> }
> MOD_INC_USE_COUNT;
> return 0;
>
> }
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