powerpc/ioda: Set "read" permission when "write" is set

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commit 6ecad912a0 upstream.

Quite often drivers set only "write" permission assuming that this
includes "read" permission as well and this works on plenty of
platforms. However IODA2 is strict about this and produces an EEH when
"read" permission is not set and reading happens.

This adds a workaround in the IODA code to always add the "read" bit
when the "write" bit is set.

Fixes: 10b35b2b74 ("powerpc/powernv: Do not set "read" flag if direction==DMA_NONE")
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Tested-by: Douglas Miller <dougmill@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Alexey Kardashevskiy 2016-02-17 18:26:31 +11:00 • committed by Greg Kroah-Hartman

parent b5311270ca

commit 602acfedc9

1 changed files with 6 additions and 0 deletions

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arch/powerpc/platforms/powernv/pci.c

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