diff options
| author | Sjur Brændeland <sjur.brandeland@stericsson.com> | 2013-03-18 09:49:14 +0100 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2013-03-18 09:50:46 +0100 |
| commit | aabd6a8fa5a933bdf968cd86e34122745c1960e8 (patch) | |
| tree | 0ad6aacfb51136986e6d3c328e63015c8dee4f11 /drivers | |
| parent | virtio: rng: disallow multiple device registrations, fixes crashes (diff) | |
| download | linux-aabd6a8fa5a933bdf968cd86e34122745c1960e8.tar.xz linux-aabd6a8fa5a933bdf968cd86e34122745c1960e8.zip | |
Revert "virtio_console: Initialize guest_connected=true for rproc_serial"
This reverts commit 8078db789a92b10ff6e2d713231b5367e014c53b, and
adds a lengthy comment explaining the problem area.
The reverted patch caused opening of ports to fail for rproc_serial.
In probe guest_connected was set to true, but port_fops_open()
fails with -EMFILE if guest_connected already is true.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/virtio_console.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index e905d5f53051..e6ba6b7887e9 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -1436,7 +1436,7 @@ static int add_port(struct ports_device *portdev, u32 id) * rproc_serial does not want the console port, only * the generic port implementation. */ - port->host_connected = port->guest_connected = true; + port->host_connected = true; else if (!use_multiport(port->portdev)) { /* * If we're not using multiport support, @@ -1752,13 +1752,23 @@ static void in_intr(struct virtqueue *vq) port->inbuf = get_inbuf(port); /* - * Don't queue up data when port is closed. This condition + * Normally the port should not accept data when the port is + * closed. For generic serial ports, the host won't (shouldn't) + * send data till the guest is connected. But this condition * can be reached when a console port is not yet connected (no - * tty is spawned) and the host sends out data to console - * ports. For generic serial ports, the host won't - * (shouldn't) send data till the guest is connected. + * tty is spawned) and the other side sends out data over the + * vring, or when a remote devices start sending data before + * the ports are opened. + * + * A generic serial port will discard data if not connected, + * while console ports and rproc-serial ports accepts data at + * any time. rproc-serial is initiated with guest_connected to + * false because port_fops_open expects this. Console ports are + * hooked up with an HVC console and is initialized with + * guest_connected to true. */ - if (!port->guest_connected) + + if (!port->guest_connected && !is_rproc_serial(port->portdev->vdev)) discard_port_data(port); spin_unlock_irqrestore(&port->inbuf_lock, flags); |