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

[Greg KH <gregkh@linuxfoundation.org>]

On Fri, Oct 30, 2026 at 07:33:56PM +0800, Zhan Xusheng wrote:
> 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?

Please resend whatever you feel should actually be applied, with better
changelog text explaining all of this.

thanks,

greg k-h