From 77232f791e0605521a978cbe7f79a93df24df374 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Mon, 13 Apr 2015 11:16:21 +0200 Subject: vt: Don't check KD_GRAPHICS when binding/unbinding This was introduced in commit 6db4063c5b72b46e9793b0f141a7a3984ac6facf Author: Antonino A. Daplas Date: Mon Jun 26 00:27:12 2006 -0700 [PATCH] VT binding: Add sysfs control to the VT layer with the justification "In addition, if any of the consoles are in KD_GRAPHICS mode, binding and unbinding will not succeed. KD_GRAPHICS mode usually indicates that the underlying console hardware is used for other purposes other than displaying text (ie X). This feature should prevent binding/unbinding from interfering with a graphics application using the VT." I think we should lift this artificial restriction though: - KD_GRAPHICS doesn't get cleaned up automatically, which means it's easy to have terminals stuck in KD_GRAPHICS when hacking around on X. - X doesn't really care, especially with drm where kms already blocks fbdev (and hence fbcon) when there's an active compositor. - This is a root-only interface with a separate .config option and it's possible to hang your machine already anyway if you unload/reload drivers and don't know what you're doing. With this patch i915.ko module reloading works again reliably, something in the recent fedora upgrades broke things. Cc: Antonino A. Daplas Cc: Peter Hurley Cc: Imre Deak Signed-off-by: Daniel Vetter Acked-by: David Herrmann Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/vt.c | 22 ++-------------------- 1 file changed, 2 insertions(+), 20 deletions(-) diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c index 08e303c..8fe5298 100644 --- a/drivers/tty/vt/vt.c +++ b/drivers/tty/vt/vt.c @@ -3204,22 +3204,6 @@ err: #ifdef CONFIG_VT_HW_CONSOLE_BINDING -static int con_is_graphics(const struct consw *csw, int first, int last) -{ - int i, retval = 0; - - for (i = first; i <= last; i++) { - struct vc_data *vc = vc_cons[i].d; - - if (vc && vc->vc_mode == KD_GRAPHICS) { - retval = 1; - break; - } - } - - return retval; -} - /* unlocked version of unbind_con_driver() */ int do_unbind_con_driver(const struct consw *csw, int first, int last, int deflt) { @@ -3305,8 +3289,7 @@ static int vt_bind(struct con_driver *con) const struct consw *defcsw = NULL, *csw = NULL; int i, more = 1, first = -1, last = -1, deflt = 0; - if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) || - con_is_graphics(con->con, con->first, con->last)) + if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) goto err; csw = con->con; @@ -3357,8 +3340,7 @@ static int vt_unbind(struct con_driver *con) int i, more = 1, first = -1, last = -1, deflt = 0; int ret; - if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE) || - con_is_graphics(con->con, con->first, con->last)) + if (!con->con || !(con->flag & CON_DRIVER_FLAG_MODULE)) goto err; csw = con->con; -- cgit v1.1