[PATCH 1/7] ACPI / LPSS: Only add device links from consumer to supplier

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Commit e6ce0ce34f65 ("ACPI / LPSS: Add device link for CHT SD card
dependency on I2C") tries to add device links from consumer to
supplier *and* the other way around.

When the consumer gets registered the supplier is not yet registered, so
acpi_lpss_find_device() cannot find it and we never end up adding the
supplier link. Although not intended this is a good thing, because the
device links are dependencies and if we add a link in both directions the
power-management core will not know which one to suspend/resume first.

I've verified through debug printk-s that indeed only the consumer
to supplier dependency gets added even before this commit removes
the code to add the link the other way.

Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
 drivers/acpi/acpi_lpss.c | 25 -------------------------
 1 file changed, 25 deletions(-)

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 83875305b1d4..40a8cab81cbd 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -486,13 +486,6 @@ static bool acpi_lpss_is_supplier(struct acpi_device *adev,
 			     link->supplier_hid, link->supplier_uid);
 }
 
-static bool acpi_lpss_is_consumer(struct acpi_device *adev,
-				  const struct lpss_device_links *link)
-{
-	return hid_uid_match(acpi_device_hid(adev), acpi_device_uid(adev),
-			     link->consumer_hid, link->consumer_uid);
-}
-
 struct hid_uid {
 	const char *hid;
 	const char *uid;
@@ -559,21 +552,6 @@ static void acpi_lpss_link_consumer(struct device *dev1,
 	put_device(dev2);
 }
 
-static void acpi_lpss_link_supplier(struct device *dev1,
-				    const struct lpss_device_links *link)
-{
-	struct device *dev2;
-
-	dev2 = acpi_lpss_find_device(link->supplier_hid, link->supplier_uid);
-	if (!dev2)
-		return;
-
-	if (acpi_lpss_dep(ACPI_COMPANION(dev1), ACPI_HANDLE(dev2)))
-		device_link_add(dev1, dev2, link->flags);
-
-	put_device(dev2);
-}
-
 static void acpi_lpss_create_device_links(struct acpi_device *adev,
 					  struct platform_device *pdev)
 {
@@ -584,9 +562,6 @@ static void acpi_lpss_create_device_links(struct acpi_device *adev,
 
 		if (acpi_lpss_is_supplier(adev, link))
 			acpi_lpss_link_consumer(&pdev->dev, link);
-
-		if (acpi_lpss_is_consumer(adev, link))
-			acpi_lpss_link_supplier(&pdev->dev, link);
 	}
 }
 
-- 
2.19.0.rc1




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