On 10-08-18 17:22, Bartlomiej Zolnierkiewicz wrote:
On Friday, August 10, 2018 01:27:57 PM Hans de Goede wrote:
Taking over the console involves allocating mem with GFP_KERNEL, talking
to drm drivers, etc. So this should not be done from an atomic context.

But the console-output trigger deferred console takeover may happen from an
atomic context, which leads to "BUG: sleeping function called from invalid
context" errors.

This commit fixes these errors by doing the deferred takeover from a

Signed-off-by: Hans de Goede <hdego...@redhat.com>

Patch queued for 4.19, thanks.

@@ -3607,8 +3620,8 @@ static int fbcon_output_notifier(struct notifier_block 
        deferred_takeover = false;
        logo_shown = FBCON_LOGO_DONTSHOW;
- for_each_registered_fb(i)
-               fbcon_fb_registered(registered_fb[i]);
+       /* We may get called in atomic context */
+       schedule_work(&fbcon_deferred_takeover_work);

After above change gcc now complains about unused variable:

drivers/video/fbdev/core/fbcon.c: In function ‘fbcon_output_notifier’:
drivers/video/fbdev/core/fbcon.c:3613:6: warning: unused variable ‘i’ 
   int i;

I fixed this while applying the patch.

Ah yes, thank you for fixing this,


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