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virtio_console: drop unused config fields

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struct ports_device includes a config field including the whole
virtio_console_config, but only max_nr_ports in there is ever updated or
used. The rest is unused and in fact does not even mirror the
device config. Drop everything except max_nr_ports,
saving some memory.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2016-12-05 21:39:42 +02:00
parent c60923cb9c
commit 7328fa64aa
1 changed files with 7 additions and 7 deletions
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14
drivers/char/virtio_console.c
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@ -152,8 +152,8 @@ struct ports_device {
spinlock_t c_ivq_lock;
spinlock_t c_ovq_lock;
/* The current config space is stored here */
struct virtio_console_config config;
/* max. number of ports this device can hold */
u32 max_nr_ports;
/* The virtio device we're associated with */
struct virtio_device *vdev;
@ -1649,11 +1649,11 @@ static void handle_control_message(struct virtio_device *vdev,
break;
}
if (virtio32_to_cpu(vdev, cpkt->id) >=
portdev->config.max_nr_ports) {
portdev->max_nr_ports) {
dev_warn(&portdev->vdev->dev,
"Request for adding port with "
"out-of-bound id %u, max. supported id: %u\n",
cpkt->id, portdev->config.max_nr_ports - 1);
cpkt->id, portdev->max_nr_ports - 1);
break;
}
add_port(portdev, virtio32_to_cpu(vdev, cpkt->id));
@ -1894,7 +1894,7 @@ static int init_vqs(struct ports_device *portdev)
u32 i, j, nr_ports, nr_queues;
int err;
nr_ports = portdev->config.max_nr_ports;
nr_ports = portdev->max_nr_ports;
nr_queues = use_multiport(portdev) ? (nr_ports + 1) * 2 : 2;
vqs = kmalloc(nr_queues * sizeof(struct virtqueue *), GFP_KERNEL);
@ -2047,13 +2047,13 @@ static int virtcons_probe(struct virtio_device *vdev)
}
multiport = false;
portdev->config.max_nr_ports = 1;
portdev->max_nr_ports = 1;
/* Don't test MULTIPORT at all if we're rproc: not a valid feature! */
if (!is_rproc_serial(vdev) &&
virtio_cread_feature(vdev, VIRTIO_CONSOLE_F_MULTIPORT,
struct virtio_console_config, max_nr_ports,
&portdev->config.max_nr_ports) == 0) {
&portdev->max_nr_ports) == 0) {
multiport = true;
}