linux-kernel - [PATCH v10 3/7] ACPI: x86: s2idle: Fix a logic error parsing AMD constraints table

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Message-ID: <20230804210129.5356-4-mario.limonciello@amd.com>
Date:   Fri, 4 Aug 2023 16:01:25 -0500
From:   Mario Limonciello <mario.limonciello@....com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Bjorn Helgaas <helgaas@...nel.org>
CC:     <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
        <linux-acpi@...r.kernel.org>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        "Iain Lane" <iain@...ngesquash.org.uk>,
        Shyam-sundar S-k <Shyam-sundar.S-k@....com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v10 3/7] ACPI: x86: s2idle: Fix a logic error parsing AMD constraints table

The constraints table should be resetting the `list` object
after running through all of `info_obj` iterations.

This adjusts whitespace as well as less code will now be included
with each loop.

Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
v9->v10:
 * split from other patches
---
 drivers/acpi/x86/s2idle.c | 35 +++++++++++++++++------------------
 1 file changed, 17 insertions(+), 18 deletions(-)

diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c
index ce62e61a9605e..b566b3aa09388 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -129,12 +129,12 @@ static void lpi_device_get_constraints_amd(void)
 				struct lpi_constraints *list;
 				acpi_status status;
 
+				list = &lpi_constraints_table[lpi_constraints_table_size];
+				list->min_dstate = -EINVAL;
+
 				for (k = 0; k < info_obj->package.count; ++k) {
 					union acpi_object *obj = &info_obj->package.elements[k];
 
-					list = &lpi_constraints_table[lpi_constraints_table_size];
-					list->min_dstate = -1;
-
 					switch (k) {
 					case 0:
 						dev_info.enabled = obj->integer.value;
@@ -149,26 +149,25 @@ static void lpi_device_get_constraints_amd(void)
 						dev_info.min_dstate = obj->integer.value;
 						break;
 					}
+				}
 
-					if (!dev_info.enabled || !dev_info.name ||
-					    !dev_info.min_dstate)
-						continue;
+				if (!dev_info.enabled || !dev_info.name ||
+				    !dev_info.min_dstate)
+					continue;
 
-					status = acpi_get_handle(NULL, dev_info.name,
-								 &list->handle);
-					if (ACPI_FAILURE(status))
-						continue;
+				status = acpi_get_handle(NULL, dev_info.name, &list->handle);
+				if (ACPI_FAILURE(status))
+					continue;
 
-					acpi_handle_debug(lps0_device_handle,
-							  "Name:%s\n", dev_info.name);
+				acpi_handle_debug(lps0_device_handle,
+						  "Name:%s\n", dev_info.name);
 
-					list->min_dstate = dev_info.min_dstate;
+				list->min_dstate = dev_info.min_dstate;
 
-					if (list->min_dstate < 0) {
-						acpi_handle_debug(lps0_device_handle,
-								  "Incomplete constraint defined\n");
-						continue;
-					}
+				if (list->min_dstate < 0) {
+					acpi_handle_debug(lps0_device_handle,
+							  "Incomplete constraint defined\n");
+					continue;
 				}
 				lpi_constraints_table_size++;
 			}
-- 
2.34.1