Revert "tty: Add a new VT mode which is like VT_PROCESS but doesn't require a VT_RELD...

This reverts commit eec9fe7d1ab4a0dfac4cb43047a7657fffd0002f.

Ari writes as the reason this should be reverted:
	The problems with this patch include:
	1. There's at least one subtlety I overlooked - switching
	between X servers (i.e. from one X VT to another) still requires
	the cooperation of both X servers. I was assuming that KMS
	eliminated this.
	2. It hasn't been tested at all (no X server patch exists which
	uses the new mode).

As he was the original author of the patch, I'll revert it.

Cc: Ari Entlich <atrigent@ccs.neu.edu>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/char/vt_ioctl.c b/drivers/char/vt_ioctl.c
index 87778dc..6aa1028 100644 (file)
--- a/drivers/char/vt_ioctl.c
+++ b/drivers/char/vt_ioctl.c
@@ -888,7 +888,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
                        ret = -EFAULT;
                        goto out;
                }
-               if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS && tmp.mode != VT_PROCESS_AUTO) {
+               if (tmp.mode != VT_AUTO && tmp.mode != VT_PROCESS) {
                        ret = -EINVAL;
                        goto out;
                }
@@ -1622,7 +1622,7 @@ static void complete_change_console(struct vc_data *vc)
         * telling it that it has acquired. Also check if it has died and
         * clean up (similar to logic employed in change_console())
         */
-       if (vc->vt_mode.mode == VT_PROCESS || vc->vt_mode.mode == VT_PROCESS_AUTO) {
+       if (vc->vt_mode.mode == VT_PROCESS) {
                /*
                 * Send the signal as privileged - kill_pid() will
                 * tell us if the process has gone or something else
@@ -1682,7 +1682,7 @@ void change_console(struct vc_data *new_vc)
         * vt to auto control.
         */
        vc = vc_cons[fg_console].d;
-       if (vc->vt_mode.mode == VT_PROCESS || vc->vt_mode.mode == VT_PROCESS_AUTO) {
+       if (vc->vt_mode.mode == VT_PROCESS) {
                /*
                 * Send the signal as privileged - kill_pid() will
                 * tell us if the process has gone or something else
@@ -1693,28 +1693,27 @@ void change_console(struct vc_data *new_vc)
                 */
                vc->vt_newvt = new_vc->vc_num;
                if (kill_pid(vc->vt_pid, vc->vt_mode.relsig, 1) == 0) {
-                       if(vc->vt_mode.mode == VT_PROCESS)
-                               /*
-                                * It worked. Mark the vt to switch to and
-                                * return. The process needs to send us a
-                                * VT_RELDISP ioctl to complete the switch.
-                                */
-                               return;
-               } else {
                        /*
-                        * The controlling process has died, so we revert back to
-                        * normal operation. In this case, we'll also change back
-                        * to KD_TEXT mode. I'm not sure if this is strictly correct
-                        * but it saves the agony when the X server dies and the screen
-                        * remains blanked due to KD_GRAPHICS! It would be nice to do
-                        * this outside of VT_PROCESS but there is no single process
-                        * to account for and tracking tty count may be undesirable.
+                        * It worked. Mark the vt to switch to and
+                        * return. The process needs to send us a
+                        * VT_RELDISP ioctl to complete the switch.
                         */
-                       reset_vc(vc);
+                       return;
                }
 
                /*
-                * Fall through to normal (VT_AUTO and VT_PROCESS_AUTO) handling of the switch...
+                * The controlling process has died, so we revert back to
+                * normal operation. In this case, we'll also change back
+                * to KD_TEXT mode. I'm not sure if this is strictly correct
+                * but it saves the agony when the X server dies and the screen
+                * remains blanked due to KD_GRAPHICS! It would be nice to do
+                * this outside of VT_PROCESS but there is no single process
+                * to account for and tracking tty count may be undesirable.
+                */
+               reset_vc(vc);
+
+               /*
+                * Fall through to normal (VT_AUTO) handling of the switch...
                 */
        }
 

diff --git a/include/linux/vt.h b/include/linux/vt.h
index 778b7b2..d5dd0bc 100644 (file)
--- a/include/linux/vt.h
+++ b/include/linux/vt.h
@@ -27,7 +27,7 @@ struct vt_mode {
 #define VT_SETMODE     0x5602  /* set mode of active vt */
 #define                VT_AUTO         0x00    /* auto vt switching */
 #define                VT_PROCESS      0x01    /* process controls switching */
-#define                VT_PROCESS_AUTO 0x02    /* process is notified of switching */
+#define                VT_ACKACQ       0x02    /* acknowledge switch */
 
 struct vt_stat {
        unsigned short v_active;        /* active vt */
@@ -38,7 +38,6 @@ struct vt_stat {
 #define VT_SENDSIG     0x5604  /* signal to send to bitmask of vts */
 
 #define VT_RELDISP     0x5605  /* release display */
-#define                VT_ACKACQ       0x02    /* acknowledge switch */
 
 #define VT_ACTIVATE    0x5606  /* make vt active */
 #define VT_WAITACTIVE  0x5607  /* wait for vt active */