Robert Beckett
ffb5f4bf45
terminal_fix_size() queries the terminal for its dimensions with CSI 18 and DSR. On a virtual console that is pointless: the kernel renders the screen itself, so TIOCGWINSZ is already authoritative. It is also slow. PID 1 queries /dev/console from console_setup(), and writes there go through redirected_tty_write(), so while plymouth holds a TIOCCONS redirect the query never reaches the VT and no reply is ever generated. Each query then waits out CONSOLE_ANSI_SEQUENCE_TIMEOUT_USEC. Previously the write failed immediately with EAGAIN — the kernel forces O_NONBLOCK on /dev/console — so the query was abandoned at no cost; sinceba10d789a8it is retried until the timeout instead. On a Steam Deck booting with console=tty1 and plymouth the two queries cost 667ms, about a quarter of userspace boot time, and no log level shows it because main() runs console_setup() between log_close() and log_open(). So skip the query on a virtual console and keep the dimensions the kernel gave us, reporting success rather than an error: declining to ask is not a failure, and the "dimensions already match" path below returns 0 for the same reason. Note this also skips the query on a /dev/ttyN that would have answered, and does not help a serial console behind a TIOCCONS redirect. Fixes:ba10d789a8Fixes:d91a184509(cherry picked from commit4ca7ac0275)
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