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Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus

Browse source 
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus:
  hvc_console: Fix race between hvc_close and hvc_remove
  virtio: disable multiport console support.
  virtio: console makes incorrect assumption about virtio API
  virtio: console: Fix early_put_chars usage
  MAINTAINERS: Put the virtio-console entry in correct alphabetical order
This commit is contained in:
Linus Torvalds 2010-04-07 18:49:20 -07:00
commit f5284e7635
4 changed files with 54 additions and 51 deletions
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13
MAINTAINERS
View file

@ -2474,12 +2474,6 @@ L: linuxppc-dev@ozlabs.org
S: Odd Fixes
F: drivers/char/hvc_*
VIRTIO CONSOLE DRIVER
M: Amit Shah <amit.shah@redhat.com>
L: virtualization@lists.linux-foundation.org
S: Maintained
F: drivers/char/virtio_console.c
iSCSI BOOT FIRMWARE TABLE (iBFT) DRIVER
M: Peter Jones <pjones@redhat.com>
M: Konrad Rzeszutek Wilk <konrad@kernel.org>
@ -5971,6 +5965,13 @@ S: Maintained
F: Documentation/filesystems/vfat.txt
F: fs/fat/
VIRTIO CONSOLE DRIVER
M: Amit Shah <amit.shah@redhat.com>
L: virtualization@lists.linux-foundation.org
S: Maintained
F: drivers/char/virtio_console.c
F: include/linux/virtio_console.h
VIRTIO HOST (VHOST)
M: "Michael S. Tsirkin" <mst@redhat.com>
L: kvm@vger.kernel.org

4
drivers/char/hvc_console.c
View file

@ -368,16 +368,12 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
hp = tty->driver_data;
spin_lock_irqsave(&hp->lock, flags);
tty_kref_get(tty);
if (--hp->count == 0) {
/* We are done with the tty pointer now. */
hp->tty = NULL;
spin_unlock_irqrestore(&hp->lock, flags);
/* Put the ref obtained in hvc_open() */
tty_kref_put(tty);
if (hp->ops->notifier_del)
hp->ops->notifier_del(hp, hp->data);

65
drivers/char/virtio_console.c
View file

@ -33,6 +33,35 @@
#include <linux/workqueue.h>
#include "hvc_console.h"
/* Moved here from .h file in order to disable MULTIPORT. */
#define VIRTIO_CONSOLE_F_MULTIPORT 1 /* Does host provide multiple ports? */
struct virtio_console_multiport_conf {
struct virtio_console_config config;
/* max. number of ports this device can hold */
__u32 max_nr_ports;
/* number of ports added so far */
__u32 nr_ports;
} __attribute__((packed));
/*
* A message that's passed between the Host and the Guest for a
* particular port.
*/
struct virtio_console_control {
__u32 id; /* Port number */
__u16 event; /* The kind of control event (see below) */
__u16 value; /* Extra information for the key */
};
/* Some events for control messages */
#define VIRTIO_CONSOLE_PORT_READY 0
#define VIRTIO_CONSOLE_CONSOLE_PORT 1
#define VIRTIO_CONSOLE_RESIZE 2
#define VIRTIO_CONSOLE_PORT_OPEN 3
#define VIRTIO_CONSOLE_PORT_NAME 4
#define VIRTIO_CONSOLE_PORT_REMOVE 5
/*
* This is a global struct for storing common data for all the devices
* this driver handles.
@ -121,7 +150,7 @@ struct ports_device {
spinlock_t cvq_lock;
/* The current config space is stored here */
struct virtio_console_config config;
struct virtio_console_multiport_conf config;
/* The virtio device we're associated with */
struct virtio_device *vdev;
@ -416,20 +445,16 @@ static ssize_t send_buf(struct port *port, void *in_buf, size_t in_count)
out_vq->vq_ops->kick(out_vq);
if (ret < 0) {
len = 0;
in_count = 0;
goto fail;
}
/*
* Wait till the host acknowledges it pushed out the data we
* sent. Also ensure we return to userspace the number of
* bytes that were successfully consumed by the host.
*/
/* Wait till the host acknowledges it pushed out the data we sent. */
while (!out_vq->vq_ops->get_buf(out_vq, &len))
cpu_relax();
fail:
/* We're expected to return the amount of data we wrote */
return len;
return in_count;
}
/*
@ -646,13 +671,13 @@ static int put_chars(u32 vtermno, const char *buf, int count)
{
struct port *port;
if (unlikely(early_put_chars))
return early_put_chars(vtermno, buf, count);
port = find_port_by_vtermno(vtermno);
if (!port)
return 0;
if (unlikely(early_put_chars))
return early_put_chars(vtermno, buf, count);
return send_buf(port, (void *)buf, count);
}
@ -1218,7 +1243,7 @@ static int add_port(struct ports_device *portdev, u32 id)
*/
static void config_work_handler(struct work_struct *work)
{
struct virtio_console_config virtconconf;
struct virtio_console_multiport_conf virtconconf;
struct ports_device *portdev;
struct virtio_device *vdev;
int err;
@ -1227,7 +1252,8 @@ static void config_work_handler(struct work_struct *work)
vdev = portdev->vdev;
vdev->config->get(vdev,
offsetof(struct virtio_console_config, nr_ports),
offsetof(struct virtio_console_multiport_conf,
nr_ports),
&virtconconf.nr_ports,
sizeof(virtconconf.nr_ports));
@ -1419,16 +1445,19 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
multiport = false;
portdev->config.nr_ports = 1;
portdev->config.max_nr_ports = 1;
#if 0 /* Multiport is not quite ready yet --RR */
if (virtio_has_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT)) {
multiport = true;
vdev->features[0] |= 1 << VIRTIO_CONSOLE_F_MULTIPORT;
vdev->config->get(vdev, offsetof(struct virtio_console_config,
nr_ports),
vdev->config->get(vdev,
offsetof(struct virtio_console_multiport_conf,
nr_ports),
&portdev->config.nr_ports,
sizeof(portdev->config.nr_ports));
vdev->config->get(vdev, offsetof(struct virtio_console_config,
max_nr_ports),
vdev->config->get(vdev,
offsetof(struct virtio_console_multiport_conf,
max_nr_ports),
&portdev->config.max_nr_ports,
sizeof(portdev->config.max_nr_ports));
if (portdev->config.nr_ports > portdev->config.max_nr_ports) {
@ -1444,6 +1473,7 @@ static int __devinit virtcons_probe(struct virtio_device *vdev)
/* Let the Host know we support multiple ports.*/
vdev->config->finalize_features(vdev);
#endif
err = init_vqs(portdev);
if (err < 0) {
@ -1526,7 +1556,6 @@ static struct virtio_device_id id_table[] = {
static unsigned int features[] = {
VIRTIO_CONSOLE_F_SIZE,
VIRTIO_CONSOLE_F_MULTIPORT,
};
static struct virtio_driver virtio_console = {

23
include/linux/virtio_console.h
View file

@ -12,37 +12,14 @@
/* Feature bits */
#define VIRTIO_CONSOLE_F_SIZE 0 /* Does host provide console size? */
#define VIRTIO_CONSOLE_F_MULTIPORT 1 /* Does host provide multiple ports? */
struct virtio_console_config {
/* colums of the screens */
__u16 cols;
/* rows of the screens */
__u16 rows;
/* max. number of ports this device can hold */
__u32 max_nr_ports;
/* number of ports added so far */
__u32 nr_ports;
} __attribute__((packed));
/*
* A message that's passed between the Host and the Guest for a
* particular port.
*/
struct virtio_console_control {
__u32 id; /* Port number */
__u16 event; /* The kind of control event (see below) */
__u16 value; /* Extra information for the key */
};
/* Some events for control messages */
#define VIRTIO_CONSOLE_PORT_READY 0
#define VIRTIO_CONSOLE_CONSOLE_PORT 1
#define VIRTIO_CONSOLE_RESIZE 2
#define VIRTIO_CONSOLE_PORT_OPEN 3
#define VIRTIO_CONSOLE_PORT_NAME 4
#define VIRTIO_CONSOLE_PORT_REMOVE 5
#ifdef __KERNEL__
int __init virtio_cons_early_init(int (*put_chars)(u32, const char *, int));
#endif /* __KERNEL__ */