Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/configh

[linux-2.6] / drivers / char / amiserial.c

diff --git a/drivers/char/amiserial.c b/drivers/char/amiserial.c
index 9d6713a93ed74ddb74adaf18aa85fd22e0ee6508..486f97c3f4e5a7d186d3370a9a6a379eb44eed64 100644 (file)
--- a/drivers/char/amiserial.c
+++ b/drivers/char/amiserial.c
@@ -112,17 +112,6 @@ static struct serial_state rs_table[1];
 
 #define NR_PORTS ARRAY_SIZE(rs_table)
 
-/*
- * tmp_buf is used as a temporary buffer by serial_write.  We need to
- * lock it in case the copy_from_user blocks while swapping in a page,
- * and some other program tries to do a serial write at the same time.
- * Since the lock will only come under contention when the system is
- * swapping and available memory is low, it makes sense to share one
- * buffer across all the serial ports, since it significantly saves
- * memory if large numbers of serial ports are open.
- */
-static unsigned char *tmp_buf;
-
 #include <asm/uaccess.h>
 
 #define serial_isroot()        (capable(CAP_SYS_ADMIN))
@@ -912,7 +901,7 @@ static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count
        if (serial_paranoia_check(info, tty->name, "rs_write"))
                return 0;
 
-       if (!info->xmit.buf || !tmp_buf)
+       if (!info->xmit.buf)
                return 0;
 
        local_save_flags(flags);
@@ -1778,7 +1767,6 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
 {
        struct async_struct     *info;
        int                     retval, line;
-       unsigned long           page;
 
        line = tty->index;
        if ((line < 0) || (line >= NR_PORTS)) {
@@ -1798,17 +1786,6 @@ static int rs_open(struct tty_struct *tty, struct file * filp)
 #endif
        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
 
-       if (!tmp_buf) {
-               page = get_zeroed_page(GFP_KERNEL);
-               if (!page) {
-                       return -ENOMEM;
-               }
-               if (tmp_buf)
-                       free_page(page);
-               else
-                       tmp_buf = (unsigned char *) page;
-       }
-
        /*
         * If the port is the middle of closing, bail out now
         */
@@ -1958,7 +1935,7 @@ static void show_serial_version(void)
 }
 
 
-static struct tty_operations serial_ops = {
+static const struct tty_operations serial_ops = {
        .open = rs_open,
        .close = rs_close,
        .write = rs_write,
@@ -2090,11 +2067,6 @@ static __exit void rs_exit(void)
          kfree(info);
        }
 
-       if (tmp_buf) {
-               free_page((unsigned long) tmp_buf);
-               tmp_buf = NULL;
-       }
-
        release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
 }