[PATCH 4.14 16/45] powerpc/powernv: Return for invalid IMC domain

From: Greg Kroah-Hartman
Date: Thu Jun 20 2019 - 14:08:19 EST

[ Upstream commit b59bd3527fe3c1939340df558d7f9d568fc9f882 ]

Currently init_imc_pmu() can fail either because we try to register an
IMC unit with an invalid domain (i.e an IMC node not supported by the
kernel) or something went wrong while registering a valid IMC unit. In
both the cases kernel provides a 'Register failed' error message.

For example when trace-imc node is not supported by the kernel, but
skiboot advertises a trace-imc node we print:

IMC Unknown Device type
IMC PMU (null) Register failed

To avoid confusion just print the unknown device type message, before
attempting PMU registration, so the second message isn't printed.

Fixes: 8f95faaac56c ("powerpc/powernv: Detect and create IMC device")
Reported-by: Pavaman Subramaniyam <pavsubra@xxxxxxxxxx>
Signed-off-by: Anju T Sudhakar <anju@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Madhavan Srinivasan <maddy@xxxxxxxxxxxxxxxxxx>
[mpe: Reword change log a bit]
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
arch/powerpc/platforms/powernv/opal-imc.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/opal-imc.c b/arch/powerpc/platforms/powernv/opal-imc.c
index 6914b289c86b..7b93191dc2e3 100644
--- a/arch/powerpc/platforms/powernv/opal-imc.c
+++ b/arch/powerpc/platforms/powernv/opal-imc.c
@@ -87,6 +87,10 @@ static int imc_pmu_create(struct device_node *parent, int pmu_index, int domain)
struct imc_pmu *pmu_ptr;
u32 offset;

+ /* Return for unknown domain */
+ if (domain < 0)
+ return -EINVAL;
/* memory for pmu */
pmu_ptr = kzalloc(sizeof(struct imc_pmu), GFP_KERNEL);
if (!pmu_ptr)