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authorAmit Shah <amit.shah@redhat.com>2011-12-21 12:28:27 +0530
committerAnthony Liguori <aliguori@us.ibm.com>2011-12-21 15:00:29 -0600
commit6640422c172e01d0e191a754d3643a68abca83bc (patch)
tree198effaabe30c44cea7a2f94e29531c57e73042e /hw/virtio-console.c
parent3799ce4ab64f578eb818689a276e4f0c73d01fb5 (diff)
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virtio-console: Check if chardev backends available before calling into them
For the callback functions invoked by the virtio-serial-bus code, check if we have chardev backends registered before we call into the chardev functions. Signed-off-by: Amit Shah <amit.shah@redhat.com> Reported-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/virtio-console.c')
-rw-r--r--hw/virtio-console.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/hw/virtio-console.c b/hw/virtio-console.c
index d3351c8..dbbea76 100644
--- a/hw/virtio-console.c
+++ b/hw/virtio-console.c
@@ -27,6 +27,11 @@ static ssize_t flush_buf(VirtIOSerialPort *port, const uint8_t *buf, size_t len)
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
ssize_t ret;
+ if (!vcon->chr) {
+ /* If there's no backend, we can just say we consumed all data. */
+ return len;
+ }
+
ret = qemu_chr_fe_write(vcon->chr, buf, len);
trace_virtio_console_flush_buf(port->id, len, ret);
@@ -52,6 +57,9 @@ static void guest_open(VirtIOSerialPort *port)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+ if (!vcon->chr) {
+ return;
+ }
qemu_chr_fe_open(vcon->chr);
}
@@ -60,6 +68,9 @@ static void guest_close(VirtIOSerialPort *port)
{
VirtConsole *vcon = DO_UPCAST(VirtConsole, port, port);
+ if (!vcon->chr) {
+ return;
+ }
qemu_chr_fe_close(vcon->chr);
}