powerpc/pseries/dlpar: handle ibm, configure-connector delay status

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[ Upstream commit 768d70e19b ]

dlpar_configure_connector() has two problems in its handling of
ibm,configure-connector's return status:

1. When the status is -2 (busy, call again), we call
   ibm,configure-connector again immediately without checking whether
   to schedule, which can result in monopolizing the CPU.
2. Extended delay status (9900..9905) goes completely unhandled,
   causing the configuration to unnecessarily terminate.

Fix both of these issues by using rtas_busy_delay().

Fixes: ab519a011c ("powerpc/pseries: Kernel DLPAR Infrastructure")
Signed-off-by: Nathan Lynch <nathanl@linux.ibm.com>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210107025900.410369-1-nathanl@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Nathan Lynch 2021-01-06 20:59:00 -06:00 • committed by Greg Kroah-Hartman

parent b1b9048137

commit c035dcae0b

1 changed files with 3 additions and 4 deletions

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arch/powerpc/platforms/pseries/dlpar.c

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