Remove Andrew Morton's old email accounts
[linux-2.6.git] / drivers / char / vt.c
index 05ca1c5..d8f83e2 100644 (file)
@@ -59,7 +59,7 @@
  * by Martin Mares <mj@atrey.karlin.mff.cuni.cz>, July 1998
  *
  * Removed old-style timers, introduced console_timer, made timer
- * deletion SMP-safe.  17Jun00, Andrew Morton <andrewm@uow.edu.au>
+ * deletion SMP-safe.  17Jun00, Andrew Morton
  *
  * Removed console_lock, enabled interrupts across all console operations
  * 13 March 2001, Andrew Morton
 #include <linux/font.h>
 #include <linux/bitops.h>
 #include <linux/notifier.h>
-
-#include <asm/io.h>
+#include <linux/device.h>
+#include <linux/io.h>
 #include <asm/system.h>
-#include <asm/uaccess.h>
+#include <linux/uaccess.h>
 
 #define MAX_NR_CON_DRIVER 16
 
@@ -301,7 +301,7 @@ static void scrup(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
        d = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
        s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * (t + nr));
        scr_memmovew(d, s, (b - t - nr) * vc->vc_size_row);
-       scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_scrl_erase_char,
+       scr_memsetw(d + (b - t - nr) * vc->vc_cols, vc->vc_video_erase_char,
                    vc->vc_size_row * nr);
 }
 
@@ -319,7 +319,7 @@ static void scrdown(struct vc_data *vc, unsigned int t, unsigned int b, int nr)
        s = (unsigned short *)(vc->vc_origin + vc->vc_size_row * t);
        step = vc->vc_cols * nr;
        scr_memmovew(s + step, s, (b - t - nr) * vc->vc_size_row);
-       scr_memsetw(s, vc->vc_scrl_erase_char, 2 * step);
+       scr_memsetw(s, vc->vc_video_erase_char, 2 * step);
 }
 
 static void do_update_region(struct vc_data *vc, unsigned long start, int count)
@@ -434,7 +434,6 @@ static void update_attr(struct vc_data *vc)
                      vc->vc_blink, vc->vc_underline,
                      vc->vc_reverse ^ vc->vc_decscnm, vc->vc_italic);
        vc->vc_video_erase_char = (build_attr(vc, vc->vc_color, 1, vc->vc_blink, 0, vc->vc_decscnm, 0) << 8) | ' ';
-       vc->vc_scrl_erase_char = (build_attr(vc, vc->vc_def_color, 1, false, false, vc->vc_decscnm, false) << 8) | ' ';
 }
 
 /* Note: inverting the screen twice should revert to the original state */
@@ -2136,27 +2135,9 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
            release_console_sem();
            return 0;
        }
-       release_console_sem();
-
        orig_buf = buf;
        orig_count = count;
 
-       /* At this point 'buf' is guaranteed to be a kernel buffer
-        * and therefore no access to userspace (and therefore sleeping)
-        * will be needed.  The con_buf_mtx serializes all tty based
-        * console rendering and vcs write/read operations.  We hold
-        * the console spinlock during the entire write.
-        */
-
-       acquire_console_sem();
-
-       vc = tty->driver_data;
-       if (vc == NULL) {
-               printk(KERN_ERR "vt: argh, driver_data _became_ NULL !\n");
-               release_console_sem();
-               goto out;
-       }
-
        himask = vc->vc_hi_font_mask;
        charmask = himask ? 0x1ff : 0xff;
 
@@ -2370,8 +2351,6 @@ rescan_last_byte:
        FLUSH
        console_conditional_schedule();
        release_console_sem();
-
-out:
        notify_update(vc);
        return n;
 #undef FLUSH
@@ -2776,6 +2755,12 @@ static int con_open(struct tty_struct *tty, struct file *filp)
                ret = vc_allocate(currcons);
                if (ret == 0) {
                        struct vc_data *vc = vc_cons[currcons].d;
+
+                       /* Still being freed */
+                       if (vc->vc_tty) {
+                               release_console_sem();
+                               return -ERESTARTSYS;
+                       }
                        tty->driver_data = vc;
                        vc->vc_tty = tty;
 
@@ -2796,34 +2781,20 @@ static int con_open(struct tty_struct *tty, struct file *filp)
        return ret;
 }
 
-/*
- * We take tty_mutex in here to prevent another thread from coming in via init_dev
- * and taking a ref against the tty while we're in the process of forgetting
- * about it and cleaning things up.
- *
- * This is because vcs_remove_sysfs() can sleep and will drop the BKL.
- */
 static void con_close(struct tty_struct *tty, struct file *filp)
 {
-       mutex_lock(&tty_mutex);
-       acquire_console_sem();
-       if (tty && tty->count == 1) {
-               struct vc_data *vc = tty->driver_data;
+       /* Nothing to do - we defer to shutdown */
+}
 
-               if (vc)
-                       vc->vc_tty = NULL;
-               tty->driver_data = NULL;
-               vcs_remove_sysfs(tty);
-               release_console_sem();
-               mutex_unlock(&tty_mutex);
-               /*
-                * tty_mutex is released, but we still hold BKL, so there is
-                * still exclusion against init_dev()
-                */
-               return;
-       }
+static void con_shutdown(struct tty_struct *tty)
+{
+       struct vc_data *vc = tty->driver_data;
+       BUG_ON(vc == NULL);
+       acquire_console_sem();
+       vc->vc_tty = NULL;
+       vcs_remove_sysfs(tty);
        release_console_sem();
-       mutex_unlock(&tty_mutex);
+       tty_shutdown(tty);
 }
 
 static int default_italic_color    = 2; // green (ASCII)
@@ -2948,10 +2919,19 @@ static const struct tty_operations con_ops = {
        .throttle = con_throttle,
        .unthrottle = con_unthrottle,
        .resize = vt_resize,
+       .shutdown = con_shutdown
 };
 
-int __init vty_init(void)
+static struct cdev vc0_cdev;
+
+int __init vty_init(const struct file_operations *console_fops)
 {
+       cdev_init(&vc0_cdev, console_fops);
+       if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
+           register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
+               panic("Couldn't register /dev/tty0 driver\n");
+       device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
+
        vcs_init();
 
        console_driver = alloc_tty_driver(MAX_NR_CONSOLES);
@@ -2970,7 +2950,6 @@ int __init vty_init(void)
        tty_set_operations(console_driver, &con_ops);
        if (tty_register_driver(console_driver))
                panic("Couldn't register console driver\n");
-
        kbd_init();
        console_map_init();
 #ifdef CONFIG_PROM_CONSOLE
@@ -3464,7 +3443,7 @@ int register_con_driver(const struct consw *csw, int first, int last)
        if (retval)
                goto err;
 
-       con_driver->dev = device_create_drvdata(vtconsole_class, NULL,
+       con_driver->dev = device_create(vtconsole_class, NULL,
                                                MKDEV(0, con_driver->node),
                                                NULL, "vtcon%i",
                                                con_driver->node);
@@ -3575,7 +3554,7 @@ static int __init vtconsole_class_init(void)
                struct con_driver *con = &registered_con_driver[i];
 
                if (con->con && !con->dev) {
-                       con->dev = device_create_drvdata(vtconsole_class, NULL,
+                       con->dev = device_create(vtconsole_class, NULL,
                                                         MKDEV(0, con->node),
                                                         NULL, "vtcon%i",
                                                         con->node);