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virtio: console: Let host know of port or device add failures

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The host may want to know and let management apps notify of port or
device add failures. Send a control message saying the device or port is
not ready in this case.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2010-05-19 22:15:47 -06:00 committed by Rusty Russell
parent 3425e706bf
commit eaeff9608a
2 changed files with 8 additions and 0 deletions
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5
drivers/char/virtio_console.c
View File

@ -1210,6 +1210,8 @@ free_cdev:
free_port:
kfree(port);
fail:
/* The host might want to notify management sw about port add failure */
send_control_msg(port, VIRTIO_CONSOLE_PORT_READY, 0);
return err;
}
@ -1488,6 +1490,9 @@ free_chrdev:
free:
kfree(portdev);
fail:
/* The host might want to notify mgmt sw about device add failure */
__send_control_msg(portdev, VIRTIO_CONSOLE_BAD_ID,
VIRTIO_CONSOLE_DEVICE_READY, 0);
return err;
}

3
include/linux/virtio_console.h
View File

@ -14,6 +14,8 @@
#define VIRTIO_CONSOLE_F_SIZE 0 /* Does host provide console size? */
#define VIRTIO_CONSOLE_F_MULTIPORT 1 /* Does host provide multiple ports? */
#define VIRTIO_CONSOLE_BAD_ID (~(u32)0)
struct virtio_console_config {
/* colums of the screens */
__u16 cols;
@ -42,6 +44,7 @@ struct virtio_console_control {
#define VIRTIO_CONSOLE_PORT_OPEN 3
#define VIRTIO_CONSOLE_PORT_NAME 4
#define VIRTIO_CONSOLE_PORT_REMOVE 5
#define VIRTIO_CONSOLE_DEVICE_READY 6
#ifdef __KERNEL__
int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int));