ACPI / MMC: PM: Unify fixing up device power

Introduce acpi_device_fix_up_power_extended() for fixing up power of
a device having an ACPI companion in a manner that takes the device's
children into account and make the MMC code use it in two places
instead of walking the list of the device ACPI companion's children
directly.

This will help to eliminate the children list head from struct
acpi_device as it is redundant and it is used in questionable ways
in some places (in particular, locking is needed for walking the
list pointed to it safely, but it is often missing).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>

1 files changed, 3 insertions, 8 deletions

diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index ed53276f6ad9..622b7de96c7f 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -1240,16 +1240,11 @@ static const struct sdhci_pci_fixes sdhci_intel_byt_sd = {
 #ifdef CONFIG_ACPI
 static void intel_mrfld_mmc_fix_up_power_slot(struct sdhci_pci_slot *slot)
 {
-	struct acpi_device *device, *child;
+	struct acpi_device *device;
 
 	device = ACPI_COMPANION(&slot->chip->pdev->dev);
-	if (!device)
-		return;
-
-	acpi_device_fix_up_power(device);
-	list_for_each_entry(child, &device->children, node)
-		if (child->status.present && child->status.enabled)
-			acpi_device_fix_up_power(child);
+	if (device)
+		acpi_device_fix_up_power_extended(device);
 }
 #else
 static inline void intel_mrfld_mmc_fix_up_power_slot(struct sdhci_pci_slot *slot) {}