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linux-sg2042
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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 <sudeep.holla@arm.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lorenzo Pieralisi 2015-05-01 10:41:10 +01:00 committed by Lee Jones
parent b64610dfbd
commit ec40c606c7
1 changed files with 5 additions and 3 deletions
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8
drivers/mfd/mfd-core.c
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@ -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;
}
}
}