[issue2148] DFBSD v2.13.0.38.g09a36 - Switch to TTY panic

["Antonio Huete Jimenez \(via DragonFly issue tracker\)" <sinknull@xxxxxxxxxxxxxxxxxxxxx>]

Antonio Huete Jimenez <tuxillo@quantumachine.net> added the comment:

Sam,

As you already know what's passed to the ioctl is struct keyboard kbd from the 
softc.

For both atkbd and ukbd that struct's private data (kb_data) is modified. One 
thing to note is that for both the ioctl function is entirely under a critical 
section.

Cheers,
Antonio Huete

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