[Bug 205497] Attempt to read amd gpu id causes a freeze

https://bugzilla.kernel.org/show_bug.cgi?id=205497

Alex Deucher (alexdeucher@gmail.com) changed:

What |Removed |Added ---------------------------------------------------------------------------- CC| |alexdeucher@gmail.com

--- Comment #3 from Alex Deucher (alexdeucher@gmail.com) --- Created attachment 285881 --> https://bugzilla.kernel.org/attachment.cgi?id=285881&action=edit possible fix

Assuming radeontop uses the info ioctl to query the registers, this patch should fix it. If it mmaps the register BAR directly, there's nothing you can do. Accessing registers while the gfx block is off will lead to garbage data and possibly hang the chip.