1 files changed, 23 insertions, 14 deletions

diff --git a/drivers/char/vt.c b/drivers/char/vt.c
index 44f03ddd8871..c734f9b1263a 100644
--- a/drivers/char/vt.c
+++ b/drivers/char/vt.c
@@ -105,6 +105,7 @@
 #include <asm/system.h>
 #include <linux/uaccess.h>
 #include <linux/kdb.h>
+#include <linux/ctype.h>
 
 #define MAX_NR_CON_DRIVER 16
 
@@ -286,8 +287,12 @@ static inline unsigned short *screenpos(struct vc_data *vc, int offset, int view
         return p;
 }
 
+/* Called  from the keyboard irq path.. */
 static inline void scrolldelta(int lines)
 {
+        /* FIXME */
+        /* scrolldelta needs some kind of consistency lock, but the BKL was
+           and still is not protecting versus the scheduled back end */
         scrollback_delta += lines;
         schedule_console_callback();
 }
@@ -704,7 +709,10 @@ void redraw_screen(struct vc_data *vc, int is_switch)
                         update_attr(vc);
                         clear_buffer_attributes(vc);
                 }
-                if (update && vc->vc_mode != KD_GRAPHICS)
+
+                /* Forcibly update if we're panicing */
+                if ((update && vc->vc_mode != KD_GRAPHICS) ||
+                    vt_force_oops_output(vc))
                         do_update_region(vc, vc->vc_origin, vc->vc_screenbuf_size / 2);
         }
         set_cursor(vc);
@@ -742,6 +750,7 @@ static void visual_init(struct vc_data *vc, int num, int init)
         vc->vc_hi_font_mask = 0;
         vc->vc_complement_mask = 0;
         vc->vc_can_do_color = 0;
+        vc->vc_panic_force_write = false;
         vc->vc_sw->con_init(vc, init);
         if (!vc->vc_complement_mask)
                 vc->vc_complement_mask = vc->vc_can_do_color ? 0x7700 : 0x0800;
@@ -774,6 +783,7 @@ int vc_allocate(unsigned int currcons)	/* return 0 on success */
             if (!vc)
                 return -ENOMEM;
             vc_cons[currcons].d = vc;
+            tty_port_init(&vc->port);
             INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
             visual_init(vc, currcons, 1);
             if (!*vc->vc_uni_pagedir_loc)
@@ -963,12 +973,12 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
  *      Resize a virtual console as seen from the console end of things. We
  *      use the common vc_do_resize methods to update the structures. The
  *      caller must hold the console sem to protect console internals and
- *      vc->vc_tty
+ *      vc->port.tty
  */
 
 int vc_resize(struct vc_data *vc, unsigned int cols, unsigned int rows)
 {
-        return vc_do_resize(vc->vc_tty, vc, cols, rows);
+        return vc_do_resize(vc->port.tty, vc, cols, rows);
 }
 
 /**
@@ -1796,8 +1806,8 @@ static void do_con_trol(struct tty_struct *tty, struct vc_data *vc, int c)
                         vc->vc_state = ESnormal;
                 return;
         case ESpalette:
-                if ( (c>='0'&&c<='9') || (c>='A'&&c<='F') || (c>='a'&&c<='f') ) {
-                        vc->vc_par[vc->vc_npar++] = (c > '9' ? (c & 0xDF) - 'A' + 10 : c - '0');
+                if (isxdigit(c)) {
+                        vc->vc_par[vc->vc_npar++] = hex_to_bin(c);
                         if (vc->vc_npar == 7) {
                                 int i = vc->vc_par[0] * 3, j = 1;
                                 vc->vc_palette[i] = 16 * vc->vc_par[j++];
@@ -2505,7 +2515,7 @@ static void vt_console_print(struct console *co, const char *b, unsigned count)
                 goto quit;
         }
 
-        if (vc->vc_mode != KD_TEXT)
+        if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
                 goto quit;
 
         /* undraw cursor first */
@@ -2611,8 +2621,6 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
                 return -EFAULT;
         ret = 0;
 
-        lock_kernel();
-
         switch (type)
         {
                 case TIOCL_SETSEL:
@@ -2687,7 +2695,6 @@ int tioclinux(struct tty_struct *tty, unsigned long arg)
                         ret = -EINVAL;
                         break;
         }
-        unlock_kernel();
         return ret;
 }
 
@@ -2800,12 +2807,12 @@ static int con_open(struct tty_struct *tty, struct file *filp)
                         struct vc_data *vc = vc_cons[currcons].d;
 
                         /* Still being freed */
-                        if (vc->vc_tty) {
+                        if (vc->port.tty) {
                                 release_console_sem();
                                 return -ERESTARTSYS;
                         }
                         tty->driver_data = vc;
-                        vc->vc_tty = tty;
+                        vc->port.tty = tty;
 
                         if (!tty->winsize.ws_row && !tty->winsize.ws_col) {
                                 tty->winsize.ws_row = vc_cons[currcons].d->vc_rows;
@@ -2833,7 +2840,7 @@ 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;
+        vc->port.tty = NULL;
         release_console_sem();
         tty_shutdown(tty);
 }
@@ -2915,6 +2922,7 @@ static int __init con_init(void)
         for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
                 vc_cons[currcons].d = vc = kzalloc(sizeof(struct vc_data), GFP_NOWAIT);
                 INIT_WORK(&vc_cons[currcons].SAK_work, vc_SAK);
+                tty_port_init(&vc->port);
                 visual_init(vc, currcons, 1);
                 vc->vc_screenbuf = kzalloc(vc->vc_screenbuf_size, GFP_NOWAIT);
                 vc_init(vc, vc->vc_rows, vc->vc_cols,
@@ -3783,7 +3791,8 @@ void do_unblank_screen(int leaving_gfx)
                 return;
         }
         vc = vc_cons[fg_console].d;
-        if (vc->vc_mode != KD_TEXT)
+        /* Try to unblank in oops case too */
+        if (vc->vc_mode != KD_TEXT && !vt_force_oops_output(vc))
                 return; /* but leave console_blanked != 0 */
 
         if (blankinterval) {
@@ -3792,7 +3801,7 @@ void do_unblank_screen(int leaving_gfx)
         }
 
         console_blanked = 0;
-        if (vc->vc_sw->con_blank(vc, 0, leaving_gfx))
+        if (vc->vc_sw->con_blank(vc, 0, leaving_gfx) || vt_force_oops_output(vc))
                 /* Low-level driver cannot restore -> do it ourselves */
                 update_screen(vc);
         if (console_blank_hook)