Hi Arnd,
On Thu, Feb 18, 2021 at 2:59 PM Arnd Bergmann <arnd@xxxxxxxxxx> wrote:
On Thu, Feb 18, 2021 at 1:30 PM Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
The reason drivers/ide is doing that may be related to IDE hard drive
quirks. The old WD Caviar drives didn't obey disabling the IDE interrupt
at the drive level. On PC, that worked fine, as IRQs 14 and 15 weren't
shared with other devices. On systems with shared interrupts, that
broke badly, and led to an interrupt storm.
So presumably anyone that has one of those old drives will not be
able to move to drivers/ata then? I see that drivers/ata doesn't do
the transfers in interrupt mode, so it would seem to rely on masking
at the device level.
I don't know. This was an issue I debugged on a friend's Amiga in 1995
or so ;-) All bad WD Caviars may have died in the meantime...
BTW, it wouldn't be the first time a drive quirk handling wasn't ported
from drivers/ide/ to drivers/ata/.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
