From 8d62fe9499b8eb027837892aad8fb52d83a52a41 Mon Sep 17 00:00:00 2001 From: Tuomas Tynkkynen Date: Fri, 13 Jul 2018 00:39:56 +0300 Subject: 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 Reviewed-by: Amit Shah Signed-off-by: Greg Kroah-Hartman --- drivers/char/virtio_console.c | 60 ++++++++++++++++--------------------------- 1 file changed, 22 insertions(+), 38 deletions(-) (limited to 'drivers/char/virtio_console.c') 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) -- cgit