From ec40c606c7aebb8d61cb47af27e2f62c26e09e29 Mon Sep 17 00:00:00 2001 From: Lorenzo Pieralisi Date: Fri, 1 May 2015 10:41:10 +0100 Subject: [PATCH] mfd: Check ACPI device companion before checking resources Current code in mfd-core calls into ACPI to check resources even on a system that booted with a DT (on kernels with both DT and ACPI support compiled in). This triggers ACPI exceptions since we may end up calling the ACPI interpreter when it has not been initialized: "ACPI Exception: AE_BAD_PARAMETER, Thread 2064154624 could not acquire Mutex [0x1] (20150410/utmutex-285)" This patch fixes the issues by adding a check for an ACPI companion device before carrying out ACPI resources checks to avoid calling the ACPI interpreter if the fwnode representing the device is an OF one. Cc: Sudeep Holla Signed-off-by: Lorenzo Pieralisi Signed-off-by: Lee Jones --- drivers/mfd/mfd-core.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c index 1aed3b7b8d9b..14fd5cbcf0f2 100644 --- a/drivers/mfd/mfd-core.c +++ b/drivers/mfd/mfd-core.c @@ -207,9 +207,11 @@ static int mfd_add_device(struct device *parent, int id, } if (!cell->ignore_resource_conflicts) { - ret = acpi_check_resource_conflict(&res[r]); - if (ret) - goto fail_alias; + if (has_acpi_companion(&pdev->dev)) { + ret = acpi_check_resource_conflict(&res[r]); + if (ret) + goto fail_alias; + } } }