proc tty: switch serial_core 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>

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index 42f4e66fccafeb40cb9b97833d2a3e9da522fa89..bf3c0e32a334ad6903e48b928f8cb35862d2cec1 100644 (file)
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -27,6 +27,8 @@
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/console.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
 #include <linux/serial_core.h>
 #include <linux/smp_lock.h>
 #include <linux/device.h>
@@ -1682,20 +1684,20 @@ static const char *uart_type(struct uart_port *port)
 
 #ifdef CONFIG_PROC_FS
 
-static int uart_line_info(char *buf, struct uart_driver *drv, int i)
+static void uart_line_info(struct seq_file *m, struct uart_driver *drv, int i)
 {
        struct uart_state *state = drv->state + i;
        int pm_state;
        struct uart_port *port = state->port;
        char stat_buf[32];
        unsigned int status;
-       int mmio, ret;
+       int mmio;
 
        if (!port)
-               return 0;
+               return;
 
        mmio = port->iotype >= UPIO_MEM;
-       ret = sprintf(buf, "%d: uart:%s %s%08llX irq:%d",
+       seq_printf(m, "%d: uart:%s %s%08llX irq:%d",
                        port->line, uart_type(port),
                        mmio ? "mmio:0x" : "port:",
                        mmio ? (unsigned long long)port->mapbase
@@ -1703,8 +1705,8 @@ static int uart_line_info(char *buf, struct uart_driver *drv, int i)
                        port->irq);
 
        if (port->type == PORT_UNKNOWN) {
-               strcat(buf, "\n");
-               return ret + 1;
+               seq_putc(m, '\n');
+               return;
        }
 
        if (capable(CAP_SYS_ADMIN)) {
@@ -1719,19 +1721,19 @@ static int uart_line_info(char *buf, struct uart_driver *drv, int i)
                        uart_change_pm(state, pm_state);
                mutex_unlock(&state->mutex);
 
-               ret += sprintf(buf + ret, " tx:%d rx:%d",
+               seq_printf(m, " tx:%d rx:%d",
                                port->icount.tx, port->icount.rx);
                if (port->icount.frame)
-                       ret += sprintf(buf + ret, " fe:%d",
+                       seq_printf(m, " fe:%d",
                                port->icount.frame);
                if (port->icount.parity)
-                       ret += sprintf(buf + ret, " pe:%d",
+                       seq_printf(m, " pe:%d",
                                port->icount.parity);
                if (port->icount.brk)
-                       ret += sprintf(buf + ret, " brk:%d",
+                       seq_printf(m, " brk:%d",
                                port->icount.brk);
                if (port->icount.overrun)
-                       ret += sprintf(buf + ret, " oe:%d",
+                       seq_printf(m, " oe:%d",
                                port->icount.overrun);
 
 #define INFOBIT(bit, str) \
@@ -1753,45 +1755,39 @@ static int uart_line_info(char *buf, struct uart_driver *drv, int i)
                STATBIT(TIOCM_RNG, "|RI");
                if (stat_buf[0])
                        stat_buf[0] = ' ';
-               strcat(stat_buf, "\n");
 
-               ret += sprintf(buf + ret, stat_buf);
-       } else {
-               strcat(buf, "\n");
-               ret++;
+               seq_puts(m, stat_buf);
        }
+       seq_putc(m, '\n');
 #undef STATBIT
 #undef INFOBIT
-       return ret;
 }
 
-static int uart_read_proc(char *page, char **start, off_t off,
-                         int count, int *eof, void *data)
+static int uart_proc_show(struct seq_file *m, void *v)
 {
-       struct tty_driver *ttydrv = data;
+       struct tty_driver *ttydrv = v;
        struct uart_driver *drv = ttydrv->driver_state;
-       int i, len = 0, l;
-       off_t begin = 0;
+       int i;
 
-       len += sprintf(page, "serinfo:1.0 driver%s%s revision:%s\n",
+       seq_printf(m, "serinfo:1.0 driver%s%s revision:%s\n",
                        "", "", "");
-       for (i = 0; i < drv->nr && len < PAGE_SIZE - 96; i++) {
-               l = uart_line_info(page + len, drv, 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 + (off - begin);
-       return (count < begin + len - off) ? count : (begin + len - off);
+       for (i = 0; i < drv->nr; i++)
+               uart_line_info(m, drv, i);
+       return 0;
 }
+
+static int uart_proc_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, uart_proc_show, PDE(inode)->data);
+}
+
+static const struct file_operations uart_proc_fops = {
+       .owner          = THIS_MODULE,
+       .open           = uart_proc_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
 #endif
 
 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
@@ -2299,7 +2295,7 @@ static const struct tty_operations uart_ops = {
        .break_ctl      = uart_break_ctl,
        .wait_until_sent= uart_wait_until_sent,
 #ifdef CONFIG_PROC_FS
-       .read_proc      = uart_read_proc,
+       .proc_fops      = &uart_proc_fops,
 #endif
        .tiocmget       = uart_tiocmget,
        .tiocmset       = uart_tiocmset,