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authorSimon Ser <contact@emersion.fr>2022-11-10 12:48:29 +0100
committerSimon Ser <contact@emersion.fr>2022-11-11 22:44:53 +0000
commit1c4a625fe3e6bc3317d3e1816eee4a701a36c588 (patch)
tree7cfcf922fa92211ad5e18a2344d1a42bf193be72 /include
parented71915742160f2b9157adbad79364e22ab7ebda (diff)
backend/drm: ensure disconnected outputs are disabled after VT switch
The following situation can be dangerous: - Output DP-1 is plugged in, compositor enables it. - User VT switches away. - User unplugs DP-1. - User VT switches back. - scan_drm_connectors() figures out the output is now disconnected, uninitializes the struct wlr_output. - The loop restoring previous output state in handle_session_active() accesses the struct wlr_output to figure out what to restore. By chance, we zero out the struct wlr_output after uninitializing it, so enabled and current_mode will always be zero. But let's make sure we handle this case explicitly, to remind future readers that it exists and make the code less fragile.
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