Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

Conflicts:
	drivers/net/ethernet/emulex/benet/be_main.c
	net/core/sysctl_net_core.c
	net/ipv4/inet_diag.c

The be_main.c conflict resolution was really tricky.  The conflict
hunks generated by GIT were very unhelpful, to say the least.  It
split functions in half and moved them around, when the real actual
conflict only existed solely inside of one function, that being
be_map_pci_bars().

So instead, to resolve this, I checked out be_main.c from the top
of net-next, then I applied the be_main.c changes from 'net' since
the last time I merged.  And this worked beautifully.

The inet_diag.c and sysctl_net_core.c conflicts were simple
overlapping changes, and were easily to resolve.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 193 insertions, 273 deletions

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index db49ec4c748e..200f9a584064 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -74,6 +74,8 @@ MODULE_DESCRIPTION (DRIVER_DESC);
 MODULE_AUTHOR ("David Brownell");
 MODULE_LICENSE ("GPL");
 
+static int ep_open(struct inode *, struct file *);
+
 
 /*----------------------------------------------------------------------*/
 
@@ -283,14 +285,15 @@ static void epio_complete (struct usb_ep *ep, struct usb_request *req)
  * still need dev->lock to use epdata->ep.
  */
 static int
-get_ready_ep (unsigned f_flags, struct ep_data *epdata)
+get_ready_ep (unsigned f_flags, struct ep_data *epdata, bool is_write)
 {
 	int	val;
 
 	if (f_flags & O_NONBLOCK) {
 		if (!mutex_trylock(&epdata->lock))
 			goto nonblock;
-		if (epdata->state != STATE_EP_ENABLED) {
+		if (epdata->state != STATE_EP_ENABLED &&
+		    (!is_write || epdata->state != STATE_EP_READY)) {
 			mutex_unlock(&epdata->lock);
 nonblock:
 			val = -EAGAIN;
@@ -305,18 +308,20 @@ nonblock:
 
 	switch (epdata->state) {
 	case STATE_EP_ENABLED:
+		return 0;
+	case STATE_EP_READY:			/* not configured yet */
+		if (is_write)
+			return 0;
+		// FALLTHRU
+	case STATE_EP_UNBOUND:			/* clean disconnect */
 		break;
 	// case STATE_EP_DISABLED:		/* "can't happen" */
-	// case STATE_EP_READY:			/* "can't happen" */
 	default:				/* error! */
 		pr_debug ("%s: ep %p not available, state %d\n",
 				shortname, epdata, epdata->state);
-		// FALLTHROUGH
-	case STATE_EP_UNBOUND:			/* clean disconnect */
-		val = -ENODEV;
-		mutex_unlock(&epdata->lock);
 	}
-	return val;
+	mutex_unlock(&epdata->lock);
+	return -ENODEV;
 }
 
 static ssize_t
@@ -363,97 +368,6 @@ ep_io (struct ep_data *epdata, void *buf, unsigned len)
 	return value;
 }
 
-
-/* handle a synchronous OUT bulk/intr/iso transfer */
-static ssize_t
-ep_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
-{
-	struct ep_data		*data = fd->private_data;
-	void			*kbuf;
-	ssize_t			value;
-
-	if ((value = get_ready_ep (fd->f_flags, data)) < 0)
-		return value;
-
-	/* halt any endpoint by doing a "wrong direction" i/o call */
-	if (usb_endpoint_dir_in(&data->desc)) {
-		if (usb_endpoint_xfer_isoc(&data->desc)) {
-			mutex_unlock(&data->lock);
-			return -EINVAL;
-		}
-		DBG (data->dev, "%s halt\n", data->name);
-		spin_lock_irq (&data->dev->lock);
-		if (likely (data->ep != NULL))
-			usb_ep_set_halt (data->ep);
-		spin_unlock_irq (&data->dev->lock);
-		mutex_unlock(&data->lock);
-		return -EBADMSG;
-	}
-
-	/* FIXME readahead for O_NONBLOCK and poll(); careful with ZLPs */
-
-	value = -ENOMEM;
-	kbuf = kmalloc (len, GFP_KERNEL);
-	if (unlikely (!kbuf))
-		goto free1;
-
-	value = ep_io (data, kbuf, len);
-	VDEBUG (data->dev, "%s read %zu OUT, status %d\n",
-		data->name, len, (int) value);
-	if (value >= 0 && copy_to_user (buf, kbuf, value))
-		value = -EFAULT;
-
-free1:
-	mutex_unlock(&data->lock);
-	kfree (kbuf);
-	return value;
-}
-
-/* handle a synchronous IN bulk/intr/iso transfer */
-static ssize_t
-ep_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
-{
-	struct ep_data		*data = fd->private_data;
-	void			*kbuf;
-	ssize_t			value;
-
-	if ((value = get_ready_ep (fd->f_flags, data)) < 0)
-		return value;
-
-	/* halt any endpoint by doing a "wrong direction" i/o call */
-	if (!usb_endpoint_dir_in(&data->desc)) {
-		if (usb_endpoint_xfer_isoc(&data->desc)) {
-			mutex_unlock(&data->lock);
-			return -EINVAL;
-		}
-		DBG (data->dev, "%s halt\n", data->name);
-		spin_lock_irq (&data->dev->lock);
-		if (likely (data->ep != NULL))
-			usb_ep_set_halt (data->ep);
-		spin_unlock_irq (&data->dev->lock);
-		mutex_unlock(&data->lock);
-		return -EBADMSG;
-	}
-
-	/* FIXME writebehind for O_NONBLOCK and poll(), qlen = 1 */
-
-	value = -ENOMEM;
-	kbuf = memdup_user(buf, len);
-	if (IS_ERR(kbuf)) {
-		value = PTR_ERR(kbuf);
-		kbuf = NULL;
-		goto free1;
-	}
-
-	value = ep_io (data, kbuf, len);
-	VDEBUG (data->dev, "%s write %zu IN, status %d\n",
-		data->name, len, (int) value);
-free1:
-	mutex_unlock(&data->lock);
-	kfree (kbuf);
-	return value;
-}
-
 static int
 ep_release (struct inode *inode, struct file *fd)
 {
@@ -481,7 +395,7 @@ static long ep_ioctl(struct file *fd, unsigned code, unsigned long value)
 	struct ep_data		*data = fd->private_data;
 	int			status;
 
-	if ((status = get_ready_ep (fd->f_flags, data)) < 0)
+	if ((status = get_ready_ep (fd->f_flags, data, false)) < 0)
 		return status;
 
 	spin_lock_irq (&data->dev->lock);
@@ -517,8 +431,8 @@ struct kiocb_priv {
 	struct mm_struct	*mm;
 	struct work_struct	work;
 	void			*buf;
-	const struct iovec	*iv;
-	unsigned long		nr_segs;
+	struct iov_iter		to;
+	const void		*to_free;
 	unsigned		actual;
 };
 
@@ -541,35 +455,6 @@ static int ep_aio_cancel(struct kiocb *iocb)
 	return value;
 }
 
-static ssize_t ep_copy_to_user(struct kiocb_priv *priv)
-{
-	ssize_t			len, total;
-	void			*to_copy;
-	int			i;
-
-	/* copy stuff into user buffers */
-	total = priv->actual;
-	len = 0;
-	to_copy = priv->buf;
-	for (i=0; i < priv->nr_segs; i++) {
-		ssize_t this = min((ssize_t)(priv->iv[i].iov_len), total);
-
-		if (copy_to_user(priv->iv[i].iov_base, to_copy, this)) {
-			if (len == 0)
-				len = -EFAULT;
-			break;
-		}
-
-		total -= this;
-		len += this;
-		to_copy += this;
-		if (total == 0)
-			break;
-	}
-
-	return len;
-}
-
 static void ep_user_copy_worker(struct work_struct *work)
 {
 	struct kiocb_priv *priv = container_of(work, struct kiocb_priv, work);
@@ -578,13 +463,16 @@ static void ep_user_copy_worker(struct work_struct *work)
 	size_t ret;
 
 	use_mm(mm);
-	ret = ep_copy_to_user(priv);
+	ret = copy_to_iter(priv->buf, priv->actual, &priv->to);
 	unuse_mm(mm);
+	if (!ret)
+		ret = -EFAULT;
 
 	/* completing the iocb can drop the ctx and mm, don't touch mm after */
 	aio_complete(iocb, ret, ret);
 
 	kfree(priv->buf);
+	kfree(priv->to_free);
 	kfree(priv);
 }
 
@@ -603,8 +491,9 @@ static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
 	 * don't need to copy anything to userspace, so we can
 	 * complete the aio request immediately.
 	 */
-	if (priv->iv == NULL || unlikely(req->actual == 0)) {
+	if (priv->to_free == NULL || unlikely(req->actual == 0)) {
 		kfree(req->buf);
+		kfree(priv->to_free);
 		kfree(priv);
 		iocb->private = NULL;
 		/* aio_complete() reports bytes-transferred _and_ faults */
@@ -618,6 +507,7 @@ static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
 
 		priv->buf = req->buf;
 		priv->actual = req->actual;
+		INIT_WORK(&priv->work, ep_user_copy_worker);
 		schedule_work(&priv->work);
 	}
 	spin_unlock(&epdata->dev->lock);
@@ -626,38 +516,17 @@ static void ep_aio_complete(struct usb_ep *ep, struct usb_request *req)
 	put_ep(epdata);
 }
 
-static ssize_t
-ep_aio_rwtail(
-	struct kiocb	*iocb,
-	char		*buf,
-	size_t		len,
-	struct ep_data	*epdata,
-	const struct iovec *iv,
-	unsigned long	nr_segs
-)
+static ssize_t ep_aio(struct kiocb *iocb,
+		      struct kiocb_priv *priv,
+		      struct ep_data *epdata,
+		      char *buf,
+		      size_t len)
 {
-	struct kiocb_priv	*priv;
-	struct usb_request	*req;
-	ssize_t			value;
+	struct usb_request *req;
+	ssize_t value;
 
-	priv = kmalloc(sizeof *priv, GFP_KERNEL);
-	if (!priv) {
-		value = -ENOMEM;
-fail:
-		kfree(buf);
-		return value;
-	}
 	iocb->private = priv;
 	priv->iocb = iocb;
-	priv->iv = iv;
-	priv->nr_segs = nr_segs;
-	INIT_WORK(&priv->work, ep_user_copy_worker);
-
-	value = get_ready_ep(iocb->ki_filp->f_flags, epdata);
-	if (unlikely(value < 0)) {
-		kfree(priv);
-		goto fail;
-	}
 
 	kiocb_set_cancel_fn(iocb, ep_aio_cancel);
 	get_ep(epdata);
@@ -669,75 +538,154 @@ fail:
 	 * allocate or submit those if the host disconnected.
 	 */
 	spin_lock_irq(&epdata->dev->lock);
-	if (likely(epdata->ep)) {
-		req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC);
-		if (likely(req)) {
-			priv->req = req;
-			req->buf = buf;
-			req->length = len;
-			req->complete = ep_aio_complete;
-			req->context = iocb;
-			value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
-			if (unlikely(0 != value))
-				usb_ep_free_request(epdata->ep, req);
-		} else
-			value = -EAGAIN;
-	} else
-		value = -ENODEV;
-	spin_unlock_irq(&epdata->dev->lock);
+	value = -ENODEV;
+	if (unlikely(epdata->ep))
+		goto fail;
 
-	mutex_unlock(&epdata->lock);
+	req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC);
+	value = -ENOMEM;
+	if (unlikely(!req))
+		goto fail;
 
-	if (unlikely(value)) {
-		kfree(priv);
-		put_ep(epdata);
-	} else
-		value = -EIOCBQUEUED;
+	priv->req = req;
+	req->buf = buf;
+	req->length = len;
+	req->complete = ep_aio_complete;
+	req->context = iocb;
+	value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
+	if (unlikely(0 != value)) {
+		usb_ep_free_request(epdata->ep, req);
+		goto fail;
+	}
+	spin_unlock_irq(&epdata->dev->lock);
+	return -EIOCBQUEUED;
+
+fail:
+	spin_unlock_irq(&epdata->dev->lock);
+	kfree(priv->to_free);
+	kfree(priv);
+	put_ep(epdata);
 	return value;
 }
 
 static ssize_t
-ep_aio_read(struct kiocb *iocb, const struct iovec *iov,
-		unsigned long nr_segs, loff_t o)
+ep_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
-	struct ep_data		*epdata = iocb->ki_filp->private_data;
-	char			*buf;
+	struct file *file = iocb->ki_filp;
+	struct ep_data *epdata = file->private_data;
+	size_t len = iov_iter_count(to);
+	ssize_t value;
+	char *buf;
 
-	if (unlikely(usb_endpoint_dir_in(&epdata->desc)))
-		return -EINVAL;
+	if ((value = get_ready_ep(file->f_flags, epdata, false)) < 0)
+		return value;
 
-	buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL);
-	if (unlikely(!buf))
-		return -ENOMEM;
+	/* halt any endpoint by doing a "wrong direction" i/o call */
+	if (usb_endpoint_dir_in(&epdata->desc)) {
+		if (usb_endpoint_xfer_isoc(&epdata->desc) ||
+		    !is_sync_kiocb(iocb)) {
+			mutex_unlock(&epdata->lock);
+			return -EINVAL;
+		}
+		DBG (epdata->dev, "%s halt\n", epdata->name);
+		spin_lock_irq(&epdata->dev->lock);
+		if (likely(epdata->ep != NULL))
+			usb_ep_set_halt(epdata->ep);
+		spin_unlock_irq(&epdata->dev->lock);
+		mutex_unlock(&epdata->lock);
+		return -EBADMSG;
+	}
 
-	return ep_aio_rwtail(iocb, buf, iocb->ki_nbytes, epdata, iov, nr_segs);
+	buf = kmalloc(len, GFP_KERNEL);
+	if (unlikely(!buf)) {
+		mutex_unlock(&epdata->lock);
+		return -ENOMEM;
+	}
+	if (is_sync_kiocb(iocb)) {
+		value = ep_io(epdata, buf, len);
+		if (value >= 0 && copy_to_iter(buf, value, to))
+			value = -EFAULT;
+	} else {
+		struct kiocb_priv *priv = kzalloc(sizeof *priv, GFP_KERNEL);
+		value = -ENOMEM;
+		if (!priv)
+			goto fail;
+		priv->to_free = dup_iter(&priv->to, to, GFP_KERNEL);
+		if (!priv->to_free) {
+			kfree(priv);
+			goto fail;
+		}
+		value = ep_aio(iocb, priv, epdata, buf, len);
+		if (value == -EIOCBQUEUED)
+			buf = NULL;
+	}
+fail:
+	kfree(buf);
+	mutex_unlock(&epdata->lock);
+	return value;
 }
 
+static ssize_t ep_config(struct ep_data *, const char *, size_t);
+
 static ssize_t
-ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
-		unsigned long nr_segs, loff_t o)
+ep_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
-	struct ep_data		*epdata = iocb->ki_filp->private_data;
-	char			*buf;
-	size_t			len = 0;
-	int			i = 0;
+	struct file *file = iocb->ki_filp;
+	struct ep_data *epdata = file->private_data;
+	size_t len = iov_iter_count(from);
+	bool configured;
+	ssize_t value;
+	char *buf;
+
+	if ((value = get_ready_ep(file->f_flags, epdata, true)) < 0)
+		return value;
 
-	if (unlikely(!usb_endpoint_dir_in(&epdata->desc)))
-		return -EINVAL;
+	configured = epdata->state == STATE_EP_ENABLED;
 
-	buf = kmalloc(iocb->ki_nbytes, GFP_KERNEL);
-	if (unlikely(!buf))
+	/* halt any endpoint by doing a "wrong direction" i/o call */
+	if (configured && !usb_endpoint_dir_in(&epdata->desc)) {
+		if (usb_endpoint_xfer_isoc(&epdata->desc) ||
+		    !is_sync_kiocb(iocb)) {
+			mutex_unlock(&epdata->lock);
+			return -EINVAL;
+		}
+		DBG (epdata->dev, "%s halt\n", epdata->name);
+		spin_lock_irq(&epdata->dev->lock);
+		if (likely(epdata->ep != NULL))
+			usb_ep_set_halt(epdata->ep);
+		spin_unlock_irq(&epdata->dev->lock);
+		mutex_unlock(&epdata->lock);
+		return -EBADMSG;
+	}
+
+	buf = kmalloc(len, GFP_KERNEL);
+	if (unlikely(!buf)) {
+		mutex_unlock(&epdata->lock);
 		return -ENOMEM;
+	}
 
-	for (i=0; i < nr_segs; i++) {
-		if (unlikely(copy_from_user(&buf[len], iov[i].iov_base,
-				iov[i].iov_len) != 0)) {
-			kfree(buf);
-			return -EFAULT;
+	if (unlikely(copy_from_iter(buf, len, from) != len)) {
+		value = -EFAULT;
+		goto out;
+	}
+
+	if (unlikely(!configured)) {
+		value = ep_config(epdata, buf, len);
+	} else if (is_sync_kiocb(iocb)) {
+		value = ep_io(epdata, buf, len);
+	} else {
+		struct kiocb_priv *priv = kzalloc(sizeof *priv, GFP_KERNEL);
+		value = -ENOMEM;
+		if (priv) {
+			value = ep_aio(iocb, priv, epdata, buf, len);
+			if (value == -EIOCBQUEUED)
+				buf = NULL;
 		}
-		len += iov[i].iov_len;
 	}
-	return ep_aio_rwtail(iocb, buf, len, epdata, NULL, 0);
+out:
+	kfree(buf);
+	mutex_unlock(&epdata->lock);
+	return value;
 }
 
 /*----------------------------------------------------------------------*/
@@ -745,15 +693,15 @@ ep_aio_write(struct kiocb *iocb, const struct iovec *iov,
 /* used after endpoint configuration */
 static const struct file_operations ep_io_operations = {
 	.owner =	THIS_MODULE,
-	.llseek =	no_llseek,
 
-	.read =		ep_read,
-	.write =	ep_write,
-	.unlocked_ioctl = ep_ioctl,
+	.open =		ep_open,
 	.release =	ep_release,
-
-	.aio_read =	ep_aio_read,
-	.aio_write =	ep_aio_write,
+	.llseek =	no_llseek,
+	.read =		new_sync_read,
+	.write =	new_sync_write,
+	.unlocked_ioctl = ep_ioctl,
+	.read_iter =	ep_read_iter,
+	.write_iter =	ep_write_iter,
 };
 
 /* ENDPOINT INITIALIZATION
@@ -770,17 +718,12 @@ static const struct file_operations ep_io_operations = {
  * speed descriptor, then optional high speed descriptor.
  */
 static ssize_t
-ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
+ep_config (struct ep_data *data, const char *buf, size_t len)
 {
-	struct ep_data		*data = fd->private_data;
 	struct usb_ep		*ep;
 	u32			tag;
 	int			value, length = len;
 
-	value = mutex_lock_interruptible(&data->lock);
-	if (value < 0)
-		return value;
-
 	if (data->state != STATE_EP_READY) {
 		value = -EL2HLT;
 		goto fail;
@@ -791,9 +734,7 @@ ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 		goto fail0;
 
 	/* we might need to change message format someday */
-	if (copy_from_user (&tag, buf, 4)) {
-		goto fail1;
-	}
+	memcpy(&tag, buf, 4);
 	if (tag != 1) {
 		DBG(data->dev, "config %s, bad tag %d\n", data->name, tag);
 		goto fail0;
@@ -806,19 +747,15 @@ ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	 */
 
 	/* full/low speed descriptor, then high speed */
-	if (copy_from_user (&data->desc, buf, USB_DT_ENDPOINT_SIZE)) {
-		goto fail1;
-	}
+	memcpy(&data->desc, buf, USB_DT_ENDPOINT_SIZE);
 	if (data->desc.bLength != USB_DT_ENDPOINT_SIZE
 			|| data->desc.bDescriptorType != USB_DT_ENDPOINT)
 		goto fail0;
 	if (len != USB_DT_ENDPOINT_SIZE) {
 		if (len != 2 * USB_DT_ENDPOINT_SIZE)
 			goto fail0;
-		if (copy_from_user (&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE,
-					USB_DT_ENDPOINT_SIZE)) {
-			goto fail1;
-		}
+		memcpy(&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE,
+			USB_DT_ENDPOINT_SIZE);
 		if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE
 				|| data->hs_desc.bDescriptorType
 					!= USB_DT_ENDPOINT) {
@@ -840,24 +777,20 @@ ep_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	case USB_SPEED_LOW:
 	case USB_SPEED_FULL:
 		ep->desc = &data->desc;
-		value = usb_ep_enable(ep);
-		if (value == 0)
-			data->state = STATE_EP_ENABLED;
 		break;
 	case USB_SPEED_HIGH:
 		/* fails if caller didn't provide that descriptor... */
 		ep->desc = &data->hs_desc;
-		value = usb_ep_enable(ep);
-		if (value == 0)
-			data->state = STATE_EP_ENABLED;
 		break;
 	default:
 		DBG(data->dev, "unconnected, %s init abandoned\n",
 				data->name);
 		value = -EINVAL;
+		goto gone;
 	}
+	value = usb_ep_enable(ep);
 	if (value == 0) {
-		fd->f_op = &ep_io_operations;
+		data->state = STATE_EP_ENABLED;
 		value = length;
 	}
 gone:
@@ -867,14 +800,10 @@ fail:
 		data->desc.bDescriptorType = 0;
 		data->hs_desc.bDescriptorType = 0;
 	}
-	mutex_unlock(&data->lock);
 	return value;
 fail0:
 	value = -EINVAL;
 	goto fail;
-fail1:
-	value = -EFAULT;
-	goto fail;
 }
 
 static int
@@ -902,15 +831,6 @@ ep_open (struct inode *inode, struct file *fd)
 	return value;
 }
 
-/* used before endpoint configuration */
-static const struct file_operations ep_config_operations = {
-	.llseek =	no_llseek,
-
-	.open =		ep_open,
-	.write =	ep_config,
-	.release =	ep_release,
-};
-
 /*----------------------------------------------------------------------*/
 
 /* EP0 IMPLEMENTATION can be partly in userspace.
@@ -989,6 +909,10 @@ ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr)
 	enum ep0_state			state;
 
 	spin_lock_irq (&dev->lock);
+	if (dev->state <= STATE_DEV_OPENED) {
+		retval = -EINVAL;
+		goto done;
+	}
 
 	/* report fd mode change before acting on it */
 	if (dev->setup_abort) {
@@ -1187,8 +1111,6 @@ ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	struct dev_data		*dev = fd->private_data;
 	ssize_t			retval = -ESRCH;
 
-	spin_lock_irq (&dev->lock);
-
 	/* report fd mode change before acting on it */
 	if (dev->setup_abort) {
 		dev->setup_abort = 0;
@@ -1234,7 +1156,6 @@ ep0_write (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	} else
 		DBG (dev, "fail %s, state %d\n", __func__, dev->state);
 
-	spin_unlock_irq (&dev->lock);
 	return retval;
 }
 
@@ -1281,6 +1202,9 @@ ep0_poll (struct file *fd, poll_table *wait)
        struct dev_data         *dev = fd->private_data;
        int                     mask = 0;
 
+	if (dev->state <= STATE_DEV_OPENED)
+		return DEFAULT_POLLMASK;
+
        poll_wait(fd, &dev->wait, wait);
 
        spin_lock_irq (&dev->lock);
@@ -1316,19 +1240,6 @@ static long dev_ioctl (struct file *fd, unsigned code, unsigned long value)
 	return ret;
 }
 
-/* used after device configuration */
-static const struct file_operations ep0_io_operations = {
-	.owner =	THIS_MODULE,
-	.llseek =	no_llseek,
-
-	.read =		ep0_read,
-	.write =	ep0_write,
-	.fasync =	ep0_fasync,
-	.poll =		ep0_poll,
-	.unlocked_ioctl =	dev_ioctl,
-	.release =	dev_release,
-};
-
 /*----------------------------------------------------------------------*/
 
 /* The in-kernel gadget driver handles most ep0 issues, in particular
@@ -1650,7 +1561,7 @@ static int activate_ep_files (struct dev_data *dev)
 			goto enomem1;
 
 		data->dentry = gadgetfs_create_file (dev->sb, data->name,
-				data, &ep_config_operations);
+				data, &ep_io_operations);
 		if (!data->dentry)
 			goto enomem2;
 		list_add_tail (&data->epfiles, &dev->epfiles);
@@ -1852,6 +1763,14 @@ dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 	u32			tag;
 	char			*kbuf;
 
+	spin_lock_irq(&dev->lock);
+	if (dev->state > STATE_DEV_OPENED) {
+		value = ep0_write(fd, buf, len, ptr);
+		spin_unlock_irq(&dev->lock);
+		return value;
+	}
+	spin_unlock_irq(&dev->lock);
+
 	if (len < (USB_DT_CONFIG_SIZE + USB_DT_DEVICE_SIZE + 4))
 		return -EINVAL;
 
@@ -1925,7 +1844,6 @@ dev_config (struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
 		 * on, they can work ... except in cleanup paths that
 		 * kick in after the ep0 descriptor is closed.
 		 */
-		fd->f_op = &ep0_io_operations;
 		value = len;
 	}
 	return value;
@@ -1956,12 +1874,14 @@ dev_open (struct inode *inode, struct file *fd)
 	return value;
 }
 
-static const struct file_operations dev_init_operations = {
+static const struct file_operations ep0_operations = {
 	.llseek =	no_llseek,
 
 	.open =		dev_open,
+	.read =		ep0_read,
 	.write =	dev_config,
 	.fasync =	ep0_fasync,
+	.poll =		ep0_poll,
 	.unlocked_ioctl = dev_ioctl,
 	.release =	dev_release,
 };
@@ -2077,7 +1997,7 @@ gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
 		goto Enomem;
 
 	dev->sb = sb;
-	dev->dentry = gadgetfs_create_file(sb, CHIP, dev, &dev_init_operations);
+	dev->dentry = gadgetfs_create_file(sb, CHIP, dev, &ep0_operations);
 	if (!dev->dentry) {
 		put_dev(dev);
 		goto Enomem;