On Tue, 2018-04-10 at 11:49:32 UTC, Nicholas Piggin wrote:
> The OPAL RTC driver does not sleep in case it gets OPAL_BUSY or
> OPAL_BUSY_EVENT from firmware, which causes large scheduling
> latencies, up to 50 seconds have been observed here when RTC stops
> responding (BMC reboot can do it).
>
> Fix this by converting it to the standard form OPAL_BUSY loop that
> sleeps.
>
> Fixes 628daa8d5abfd ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks"
> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> Cc: linux-rtc@xxxxxxxxxxxxxxx
> Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
> Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/682e6b4da5cbe8e9a53f979a58c2a9
cheers
