From: Daniel Vetter Date: Tue, 8 Jul 2014 08:02:43 +0000 (+0200) Subject: drm/i915: Only unbind vgacon, not other console drivers X-Git-Tag: firefly_0821_release~176^2~3640^2~1^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1bb9e632a0aeee1121e652ee4dc80e5e6f14bcd2;p=firefly-linux-kernel-4.4.55.git drm/i915: Only unbind vgacon, not other console drivers The console subsystem only provides a function to switch to a given console, but we want to actually only switach away from vgacon. Unconditionally switching to the dummy console resulted in switching away from fbcon in multi-gpu setups when other gpu drivers are loaded before i915. Then either the reinitialization of fbcon when i915 registers its fbdev emulation or the teardown of the fbcon driver killed the machine. So only switch to the dummy console when it's required. Kudos to Chris for the original idea, I've only refined it a bit to still unregister vgacon even when it's currently unused. This regression has been introduced in commit a4de05268e674e8ed31df6348269e22d6c6a1803 Author: Daniel Vetter Date: Thu Jun 5 16:20:46 2014 +0200 drm/i915: Kick out vga console Reported-and-tested-by: Ed Tomlinson Cc: Chris Wilson Cc: David Herrmann Reviewed-by: Chris Wilson Reviewed-by: David Herrmann Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 6c656392d67d..d44344140627 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1464,12 +1464,13 @@ static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv) #else static int i915_kick_out_vgacon(struct drm_i915_private *dev_priv) { - int ret; + int ret = 0; DRM_INFO("Replacing VGA console driver\n"); console_lock(); - ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1); + if (con_is_bound(&vga_con)) + ret = do_take_over_console(&dummy_con, 0, MAX_NR_CONSOLES - 1, 1); if (ret == 0) { ret = do_unregister_con_driver(&vga_con);