Bug 216011

Summary: Commit fbdev: vesafb: Cleanup fb_info in .fb_destroy rather than .remove broke my boot
Product: Drivers Reporter: Adrian Bassett (Adrian.Bassett)
Component: Console/FramebuffersAssignee: James Simmons (jsimmons)
Status: NEW ---    
Severity: normal    
Priority: P1    
Hardware: Intel   
OS: Linux   
Kernel Version: 5.17.9 Subsystem:
Regression: Yes Bisected commit-id:

Description Adrian Bassett 2022-05-21 11:42:09 UTC 
Upgrading from linux kernel 5.17.8 to 5.17.9 on a self-configured/self-compiled unaltered upstream kernel led to my amd64 system no longer booting.

The last thing I saw on my screen was:

'fb0: switching to i915drmfb from VESA FGA'

However, booting from a distribution kernel, it was not difficult to determine that that succeeded because it was setting both CONFIG_SYSFB_SIMPLEFB and CONFIG_DRM_SIMPLEDRM, neither of which were present in my failing config:  adding them fixed the problem.

I am filing this in case there is either a/ a bug in the changed 5.17.9 code;  or b/ the changes there have exposed a bug elsewhere, possibly in the fb infrastructure as a whole. or else in a particular fb driver.

Of course, it might be that CONFIG_SYSFB_SIMPLEFB and CONFIG_DRM_SIMPLEDRM ought generally to be set.  However, that was not previously necessary in my case.