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virtio-console: Also throttle when less was written then requested

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This is necessary so that we get properly woken up to write the rest.

This patch also changes the len argument to the have_data callback, to
avoid doing an unsigned signed comparison.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
This commit is contained in:
Hans de Goede 2013-04-05 11:30:19 +02:00 committed by Gerd Hoffmann
parent 8bb9f51ca2
commit f9fb0532fb
2 changed files with 6 additions and 4 deletions
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8
hw/char/virtio-console.c
View file

@ -34,7 +34,8 @@ static gboolean chr_write_unblocked(GIOChannel *chan, GIOCondition cond,
}
/* Callback function that's called when the guest sends us data */
static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
static ssize_t flush_buf(VirtIOSerialPort *port,
const uint8_t *buf, ssize_t len)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
ssize_t ret;
@ -47,7 +48,7 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
ret = qemu_chr_fe_write(vcon->chr, buf, len);
trace_virtio_console_flush_buf(port->id, len, ret);
if (ret <= 0) {
if (ret < len) {
VirtIOSerialPortClass *k = VIRTIO_SERIAL_PORT_GET_CLASS(port);
/*
@ -56,7 +57,8 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
* we had a finer-grained message, like -EPIPE, we could close
* this connection.
*/
ret = 0;
if (ret < 0)
ret = 0;
if (!k->is_console) {
virtio_serial_throttle_port(port, true);
qemu_chr_fe_add_watch(vcon->chr, G_IO_OUT, chr_write_unblocked,

2
include/hw/virtio/virtio-serial.h
View file

@ -104,7 +104,7 @@ typedef struct VirtIOSerialPortClass {
* 'len'. In this case, throttling will be enabled for this port.
*/
ssize_t (*have_data)(VirtIOSerialPort *port, const uint8_t *buf,
size_t len);
ssize_t len);
} VirtIOSerialPortClass;
/*