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authorTuomas Tynkkynen <tuomas@tuxera.com>2018-07-12 23:39:56 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-07-16 12:03:53 +0200
commit8d62fe9499b8eb027837892aad8fb52d83a52a41 (patch)
tree92d64c047f2eac06fa241ef2d968467adca06787 /drivers/char/virtio_console.c
parentvme: ca91cx42: remove redundant variable i (diff)
downloadlinux-8d62fe9499b8eb027837892aad8fb52d83a52a41.tar.xz
linux-8d62fe9499b8eb027837892aad8fb52d83a52a41.zip
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>
Diffstat (limited to 'drivers/char/virtio_console.c')
-rw-r--r--drivers/char/virtio_console.c60
1 files changed, 22 insertions, 38 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 17084cfcf53e..5b5b5d72eab7 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -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;
+
+ 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);
- out_count = 1024;
- buf = kmalloc(out_count, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
+ return 0;
+}
- 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);
-
- 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)