Subject: Re: [3/3] powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops

From: Michael Ellerman <[email-masked]>
Date: Thu, 12 Apr 2018 00:49:34 +1000 (AEST)

On Tue, 2018-04-10 at 11:49:33 UTC, Nicholas Piggin wrote:
> The OPAL NVRAM driver does not sleep in case it gets OPAL_BUSY or
> OPAL_BUSY_EVENT from firmware, which causes large scheduling
> latencies, and various lockup errors to trigger (again, BMC reboot
> can cause 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 <[email-masked]>
> Signed-off-by: Nicholas Piggin <[email-masked]>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/3b8070335f751aac9f1526ae2e012e

cheers