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 for <linuxppc-dev@lists.ozlabs.org>; Thu, 12 Apr 2018 00:49:34 +1000 (AEST)
In-Reply-To: <20180410114933.24581-4-npiggin@gmail.com>
To: Nicholas Piggin <npiggin@gmail.com>, linuxppc-dev@lists.ozlabs.org
From: Michael Ellerman <patch-notifications@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [3/3] powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops
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Date: Thu, 12 Apr 2018 00:49:34 +1000 (AEST)
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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 <benh@kernel.crashing.org>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Applied to powerpc fixes, thanks.

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

cheers