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[Qemu-devel] [PATCH 3/3] virtio-serial-bus: let chardev know the exact n
From: |
Amit Shah |
Subject: |
[Qemu-devel] [PATCH 3/3] virtio-serial-bus: let chardev know the exact number of bytes requested |
Date: |
Fri, 6 Jul 2012 16:07:09 +0530 |
Using the virtqueue_avail_bytes() function had an unnecessarily
crippling effect on the number of bytes needed by the guest as reported
to the chardev layer in the can_read() callback.
Using the new virtqueue_get_avail_bytes() function will let us advertise
the exact number of bytes we can send to the guest.
Signed-off-by: Amit Shah <address@hidden>
---
hw/virtio-serial-bus.c | 11 +++--------
1 files changed, 3 insertions(+), 8 deletions(-)
diff --git a/hw/virtio-serial-bus.c b/hw/virtio-serial-bus.c
index 96382a4..44d5862 100644
--- a/hw/virtio-serial-bus.c
+++ b/hw/virtio-serial-bus.c
@@ -287,6 +287,7 @@ ssize_t virtio_serial_write(VirtIOSerialPort *port, const
uint8_t *buf,
size_t virtio_serial_guest_ready(VirtIOSerialPort *port)
{
VirtQueue *vq = port->ivq;
+ unsigned int bytes;
if (!virtio_queue_ready(vq) ||
!(port->vser->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK) ||
@@ -296,14 +297,8 @@ size_t virtio_serial_guest_ready(VirtIOSerialPort *port)
if (use_multiport(port->vser) && !port->guest_connected) {
return 0;
}
-
- if (virtqueue_avail_bytes(vq, 4096, 0)) {
- return 4096;
- }
- if (virtqueue_avail_bytes(vq, 1, 0)) {
- return 1;
- }
- return 0;
+ virtqueue_get_avail_bytes(vq, &bytes, NULL);
+ return bytes;
}
static void flush_queued_data_bh(void *opaque)
--
1.7.7.6