powerpc/powernv: Fix OPAL NVRAM driver OPAL_BUSY loops

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commit 3b8070335f upstream.

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: 628daa8d5a ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks")
Depends-on: 34dd25de9f ("powerpc/powernv: define a standard delay for OPAL_BUSY type retry loops")
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

...

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Nicholas Piggin 2018-04-10 21:49:33 +10:00 • committed by Ben Hutchings

parent 153da3464b

commit d79e2213f2

1 changed files with 6 additions and 1 deletions

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arch/powerpc/platforms/powernv/opal-nvram.c

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