proc tty: switch ia64 simserial to ->proc_fops

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/ia64/hp/sim/simserial.c

@@ -24,6 +24,7 @@
 #include <linux/major.h>
 #include <linux/fcntl.h>
 #include <linux/mm.h>
+#include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/capability.h>
 #include <linux/console.h>
@@ -848,38 +849,36 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
  * /proc fs routines....
  */
 
-static inline int line_info(char *buf, struct serial_state *state)
+static inline void line_info(struct seq_file *m, struct serial_state *state)
 {
-	return sprintf(buf, "%d: uart:%s port:%lX irq:%d\n",
+	seq_printf(m, "%d: uart:%s port:%lX irq:%d\n",
 		       state->line, uart_config[state->type].name,
 		       state->port, state->irq);
 }
 
-static int rs_read_proc(char *page, char **start, off_t off, int count,
-		 int *eof, void *data)
+static int rs_proc_show(struct seq_file *m, void *v)
 {
-	int i, len = 0, l;
-	off_t	begin = 0;
-
-	len += sprintf(page, "simserinfo:1.0 driver:%s\n", serial_version);
-	for (i = 0; i < NR_PORTS && len < 4000; i++) {
-		l = line_info(page + len, &rs_table[i]);
-		len += l;
-		if (len+begin > off+count)
-			goto done;
-		if (len+begin < off) {
-			begin += len;
-			len = 0;
-		}
-	}
-	*eof = 1;
-done:
-	if (off >= len+begin)
-		return 0;
-	*start = page + (begin-off);
-	return ((count < begin+len-off) ? count : begin+len-off);
+	int i;
+
+	seq_printf(m, "simserinfo:1.0 driver:%s\n", serial_version);
+	for (i = 0; i < NR_PORTS; i++)
+		line_info(m, &rs_table[i]);
+	return 0;
 }
 
+static int rs_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, rs_proc_show, NULL);
+}
+
+static const struct file_operations rs_proc_fops = {
+	.owner		= THIS_MODULE,
+	.open		= rs_proc_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= single_release,
+};
+
 /*
  * ---------------------------------------------------------------------
  * rs_init() and friends
@@ -917,7 +916,7 @@ static const struct tty_operations hp_ops = {
 	.start = rs_start,
 	.hangup = rs_hangup,
 	.wait_until_sent = rs_wait_until_sent,
-	.read_proc = rs_read_proc,
+	.proc_fops = &rs_proc_fops,
 };
 
 /*