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virtio: virtconsole: Use seq_file for debugfs operations 

Simplifies the code and is more conventional to what's used in the rest
of the kernel for debugfs ops.

Signed-off-by: Tuomas Tynkkynen <tuomas@tuxera.com>
Reviewed-by: Amit Shah <amit@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tuomas Tynkkynen 2018-07-13 00:39:56 +03:00 committed by Greg Kroah-Hartman
parent 566208494e
commit 8d62fe9499
1 changed files with 21 additions and 37 deletions
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58
drivers/char/virtio_console.c
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@ -1309,51 +1309,35 @@ static const struct attribute_group port_attribute_group = {
.attrs = port_sysfs_entries,
};
static ssize_t debugfs_read(struct file *filp, char __user *ubuf,
size_t count, loff_t *offp)
static int debugfs_show(struct seq_file *s, void *data)
{
struct port *port;
char *buf;
ssize_t ret, out_offset, out_count;
struct port *port = s->private;
out_count = 1024;
buf = kmalloc(out_count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
seq_printf(s, "name: %s\n", port->name ? port->name : "");
seq_printf(s, "guest_connected: %d\n", port->guest_connected);
seq_printf(s, "host_connected: %d\n", port->host_connected);
seq_printf(s, "outvq_full: %d\n", port->outvq_full);
seq_printf(s, "bytes_sent: %lu\n", port->stats.bytes_sent);
seq_printf(s, "bytes_received: %lu\n", port->stats.bytes_received);
seq_printf(s, "bytes_discarded: %lu\n", port->stats.bytes_discarded);
seq_printf(s, "is_console: %s\n",
is_console_port(port) ? "yes" : "no");
seq_printf(s, "console_vtermno: %u\n", port->cons.vtermno);
port = filp->private_data;
out_offset = 0;
out_offset += snprintf(buf + out_offset, out_count,
"name: %s\n", port->name ? port->name : "");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"guest_connected: %d\n", port->guest_connected);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"host_connected: %d\n", port->host_connected);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"outvq_full: %d\n", port->outvq_full);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"bytes_sent: %lu\n", port->stats.bytes_sent);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"bytes_received: %lu\n",
port->stats.bytes_received);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"bytes_discarded: %lu\n",
port->stats.bytes_discarded);
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"is_console: %s\n",
is_console_port(port) ? "yes" : "no");
out_offset += snprintf(buf + out_offset, out_count - out_offset,
"console_vtermno: %u\n", port->cons.vtermno);
return 0;
}
ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
kfree(buf);
return ret;
static int debugfs_open(struct inode *inode, struct file *file)
{
return single_open(file, debugfs_show, inode->i_private);
}
static const struct file_operations port_debugfs_ops = {
.owner = THIS_MODULE,
.open = simple_open,
.read = debugfs_read,
.open = debugfs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void set_console_size(struct port *port, u16 rows, u16 cols)