Re: [PATCH] m68k/mac: Replace macide driver with generic platform driver

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

On 4/25/21 11:06 AM, Finn Thain wrote:
> This was tested on my Quadra 630. I haven't tested it on my PowerBook 150
> because I don't have a RAM adapter board for it.
> 
> Apparently, the hardware I tested doesn't need macide_clear_irq() or
> macide_test_irq() -- if it did, the generic driver would not have worked.
> It's possible that those routines are needed for the PowerBook 150 but
> we can cross that bridge if and when we come to it.
> 
> BTW, macide_clear_irq() appears to suffer from a race condition. The write
> to the interrupt flags register could easily have unintended side effects
> as it may alter other flag bits. Fortunately, all of the other bits are
> unused by Linux. Moreover, when tested on my Quadra 630, that assignment
> (*ide_ifr &= ~0x20) was observed to have no effect on bit 5.

Shouldn't we switch to a libata driver instead with legacy IDE been slated
for removal from the Linux kernel?

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
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