From dd0314f7bb407bc4bdb3ea769b9c8a3a5d39ffd7 Mon Sep 17 00:00:00 2001 From: "Antonino A. Daplas" Date: Mon, 7 Nov 2005 01:00:38 -0800 Subject: [PATCH] [PATCH] fbcon: Initialize new driver when old driver is released If machine has more than 1 driver installed, and they all drive the same hardware, it's possible that the driver's fb_release() method will attempt to restore the hardware state to the initial state. This will leave the new driver in an undefined state. To prevent this problem, initialize the new driver by calling fb_set_par() when the old driver is released by fbcon. Signed-off-by: Antonino Daplas Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/console/fbcon.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/video/console/fbcon.c b/drivers/video/console/fbcon.c index e111a88612f..5ff51cd0a2a 100644 --- a/drivers/video/console/fbcon.c +++ b/drivers/video/console/fbcon.c @@ -630,6 +630,15 @@ static int con2fb_release_oldinfo(struct vc_data *vc, struct fb_info *oldinfo, kfree(oldinfo->fbcon_par); oldinfo->fbcon_par = NULL; module_put(oldinfo->fbops->owner); + /* + If oldinfo and newinfo are driving the same hardware, + the fb_release() method of oldinfo may attempt to + restore the hardware state. This will leave the + newinfo in an undefined state. Thus, a call to + fb_set_par() may be needed for the newinfo. + */ + if (newinfo->fbops->fb_set_par) + newinfo->fbops->fb_set_par(newinfo); } return err; -- 2.41.0