linux-kernel - [PATCH 4.9 135/175] Revert "ACPI / resources: Use AE_CTRL

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Message-Id: <20201228124859.785375000@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:49:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Daniel Scally <djrscally@...il.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 4.9 135/175] Revert "ACPI / resources: Use AE_CTRL_TERMINATE to terminate resources walks"

From: Daniel Scally <djrscally@...il.com>

commit 12fc4dad94dfac25599f31257aac181c691ca96f upstream.

This reverts commit 8a66790b7850a6669129af078768a1d42076a0ef.

Switching this function to AE_CTRL_TERMINATE broke the documented
behaviour of acpi_dev_get_resources() - AE_CTRL_TERMINATE does not, in
fact, terminate the resource walk because acpi_walk_resource_buffer()
ignores it (specifically converting it to AE_OK), referring to that
value as "an OK termination by the user function". This means that
acpi_dev_get_resources() does not abort processing when the preproc
function returns a negative value.

Signed-off-by: Daniel Scally <djrscally@...il.com>
Cc: 3.10+ <stable@...r.kernel.org> # 3.10+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/resource.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -532,7 +532,7 @@ static acpi_status acpi_dev_process_reso
 		ret = c->preproc(ares, c->preproc_data);
 		if (ret < 0) {
 			c->error = ret;
-			return AE_CTRL_TERMINATE;
+			return AE_ABORT_METHOD;
 		} else if (ret > 0) {
 			return AE_OK;
 		}