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Commit bb014db0 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux 

Pull virtio fixes from Rusty Russell:
 "More virtio console fixes than I'm happy with, but all real issues,
  and all CC:stable.."

* tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux:
  virtio-scsi: Fix virtqueue affinity setup
  virtio: console: return -ENODEV on all read operations after unplug
  virtio: console: fix raising SIGIO after port unplug
  virtio: console: clean up port data immediately at time of unplug
  virtio: console: fix race in port_fops_open() and port unplug
  virtio: console: fix race with port unplug and open/close
  virtio/console: Add pipe_lock/unlock for splice_write
  virtio/console: Quit from splice_write if pipe->nrbufs is 0
parents 67ef6265 aa52aeea

drivers/char/virtio_console.c

+48 −22
Original line number Diff line number Diff line
@@ -272,9 +272,12 @@ static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, 
	unsigned long flags;



	spin_lock_irqsave(&portdev->ports_lock, flags);

	list_for_each_entry(port, &portdev->ports, list)

		if (port->cdev->dev == dev)

	list_for_each_entry(port, &portdev->ports, list) {

		if (port->cdev->dev == dev) {

			kref_get(&port->kref);

			goto out;

		}

	}

	port = NULL;

out:

	spin_unlock_irqrestore(&portdev->ports_lock, flags);
@@ -746,6 +749,10 @@ static ssize_t port_fops_read(struct file *filp, char __user *ubuf, 


	port = filp->private_data;



	/* Port is hot-unplugged. */

	if (!port->guest_connected)

		return -ENODEV;



	if (!port_has_data(port)) {

		/*

		 * If nothing's connected on the host just return 0 in
@@ -762,7 +769,7 @@ static ssize_t port_fops_read(struct file *filp, char __user *ubuf, 
		if (ret < 0)

			return ret;

	}

	/* Port got hot-unplugged. */

	/* Port got hot-unplugged while we were waiting above. */

	if (!port->guest_connected)

		return -ENODEV;

	/*
@@ -932,13 +939,25 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, 
	if (is_rproc_serial(port->out_vq->vdev))

		return -EINVAL;



	/*

	 * pipe->nrbufs == 0 means there are no data to transfer,

	 * so this returns just 0 for no data.

	 */

	pipe_lock(pipe);

	if (!pipe->nrbufs) {

		ret = 0;

		goto error_out;

	}



	ret = wait_port_writable(port, filp->f_flags & O_NONBLOCK);

	if (ret < 0)

		return ret;

		goto error_out;



	buf = alloc_buf(port->out_vq, 0, pipe->nrbufs);

	if (!buf)

		return -ENOMEM;

	if (!buf) {

		ret = -ENOMEM;

		goto error_out;

	}



	sgl.n = 0;

	sgl.len = 0;
@@ -946,12 +965,17 @@ static ssize_t port_fops_splice_write(struct pipe_inode_info *pipe, 
	sgl.sg = buf->sg;

	sg_init_table(sgl.sg, sgl.size);

	ret = __splice_from_pipe(pipe, &sd, pipe_to_sg);

	pipe_unlock(pipe);

	if (likely(ret > 0))

		ret = __send_to_port(port, buf->sg, sgl.n, sgl.len, buf, true);



	if (unlikely(ret <= 0))

		free_buf(buf, true);

	return ret;



error_out:

	pipe_unlock(pipe);

	return ret;

}



static unsigned int port_fops_poll(struct file *filp, poll_table *wait)
@@ -1019,14 +1043,14 @@ static int port_fops_open(struct inode *inode, struct file *filp) 
	struct port *port;

	int ret;



	/* We get the port with a kref here */

	port = find_port_by_devt(cdev->dev);

	if (!port) {

		/* Port was unplugged before we could proceed */

		return -ENXIO;

	}

	filp->private_data = port;



	/* Prevent against a port getting hot-unplugged at the same time */

	spin_lock_irq(&port->portdev->ports_lock);

	kref_get(&port->kref);

	spin_unlock_irq(&port->portdev->ports_lock);



	/*

	 * Don't allow opening of console port devices -- that's done

	 * via /dev/hvc
@@ -1498,14 +1522,6 @@ static void remove_port(struct kref *kref) 


	port = container_of(kref, struct port, kref);



	sysfs_remove_group(&port->dev->kobj, &port_attribute_group);

	device_destroy(pdrvdata.class, port->dev->devt);

	cdev_del(port->cdev);



	kfree(port->name);



	debugfs_remove(port->debugfs_file);



	kfree(port);

}
@@ -1539,12 +1555,14 @@ static void unplug_port(struct port *port) 
	spin_unlock_irq(&port->portdev->ports_lock);



	if (port->guest_connected) {

		/* Let the app know the port is going down. */

		send_sigio_to_port(port);



		/* Do this after sigio is actually sent */

		port->guest_connected = false;

		port->host_connected = false;

		wake_up_interruptible(&port->waitqueue);



		/* Let the app know the port is going down. */

		send_sigio_to_port(port);

		wake_up_interruptible(&port->waitqueue);

	}



	if (is_console_port(port)) {
@@ -1563,6 +1581,14 @@ static void unplug_port(struct port *port) 
	 */

	port->portdev = NULL;



	sysfs_remove_group(&port->dev->kobj, &port_attribute_group);

	device_destroy(pdrvdata.class, port->dev->devt);

	cdev_del(port->cdev);



	kfree(port->name);



	debugfs_remove(port->debugfs_file);



	/*

	 * Locks around here are not necessary - a port can't be

	 * opened after we removed the port struct from ports_list

drivers/scsi/virtio_scsi.c

+1 −1
Original line number Diff line number Diff line
@@ -751,7 +751,7 @@ static void __virtscsi_set_affinity(struct virtio_scsi *vscsi, bool affinity) 


		vscsi->affinity_hint_set = true;

	} else {

		for (i = 0; i < vscsi->num_queues - VIRTIO_SCSI_VQ_BASE; i++)

		for (i = 0; i < vscsi->num_queues; i++)

			virtqueue_set_affinity(vscsi->req_vqs[i].vq, -1);



		vscsi->affinity_hint_set = false;