diff options
| author | Amit Shah <amit.shah@redhat.com> | 2013-07-29 06:55:38 +0200 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2013-07-29 07:20:49 +0200 |
| commit | 314081f1025e9ea77b69261f21183e9be18a6f91 (patch) | |
| tree | 5e6dc6c56dc4017999f646f4916cb3f8cc0055e5 /drivers/char | |
| parent | virtio: console: add locking in port unplug path (diff) | |
| download | linux-314081f1025e9ea77b69261f21183e9be18a6f91.tar.xz linux-314081f1025e9ea77b69261f21183e9be18a6f91.zip | |
virtio: console: fix locking around send_sigio_to_port()
send_sigio_to_port() checks the value of guest_connected, which we
always modify under the inbuf_lock; make sure invocations of
send_sigio_to_port() have take the inbuf_lock around the call.
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/virtio_console.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index 3572c5a92e8e..d5e2c7050291 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1661,7 +1661,9 @@ static void handle_control_message(struct ports_device *portdev, * If the guest is connected, it'll be interested in * knowing the host connection state changed. */ + spin_lock_irq(&port->inbuf_lock); send_sigio_to_port(port); + spin_unlock_irq(&port->inbuf_lock); break; case VIRTIO_CONSOLE_PORT_NAME: /* @@ -1781,13 +1783,13 @@ static void in_intr(struct virtqueue *vq) if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) discard_port_data(port); + /* Send a SIGIO indicating new data in case the process asked for it */ + send_sigio_to_port(port); + spin_unlock_irqrestore(&port->inbuf_lock, flags); wake_up_interruptible(&port->waitqueue); - /* Send a SIGIO indicating new data in case the process asked for it */ - send_sigio_to_port(port); - if (is_console_port(port) && hvc_poll(port->cons.hvc)) hvc_kick(); } |