Re: [PATCH v4 1/2] tty: sysrq: don't expose a partially written reset_seq

[Zhan Xusheng]

Hi Greg,

On Fri, Oct 30, 2026 at 09:33:41AM +0100, Greg KH wrote:
> So this feature has never worked?  Or it is just "one change only"?  So
> your change is an addition to the feature, not a bugfix?

It is a fix.  154b7a489a5b ("Input: sysrq - allow specifying alternate
reset sequence") added reset_seq as a writable parameter, together with
a version counter so that each keyboard rereads the sequence after a
write.  The reread just never clears the old keys, so on a keyboard
that already used the old value, a new one has never worked.  Hardly
anyone changes it at runtime, which is likely why nobody noticed.

> So this isn't a "real" issue?  If you are modifying the key sequence,
> how can you press the key at the same time?  Doing "major" rework for
> that might just not be worth it.

Agreed, please drop 1/2.  With only 2/2, that race can hit any
keyboard, not only ones that never used a sequence.  Do you want 2/2
resent on its own?

Thanks,
Zhan Xusheng