linux-kernel - [PATCH v5 2/5] ACPICA: Parser: Fix a regression in LoadTable support

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Date:   Fri, 23 Sep 2016 11:26:43 +0800
From:   Lv Zheng <lv.zheng@...el.com>
To:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <len.brown@...el.com>
Cc:     Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
        <linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
        Bob Moore <robert.moore@...el.com>
Subject: [PATCH v5 2/5] ACPICA: Parser: Fix a regression in LoadTable support

ACPICA commit a78506e0ce8ab1d20db2a055d99cf9143e89eb29

LoadTable allows an alternative RootPathString than the default "\", while
the new table execution support fails to keep this logic.

This regression can be detected by ASLTS - TLT0.tst4, this patch fixes this
regression.

Linux upstream is not affected by this regression as we haven't enabled the
new table execution support there. BZ 1326, Lv Zheng.

Link: https://github.com/acpica/acpica/commit/a78506e0
Link: https://bugs.acpica.org/show_bug.cgi?id=1326
Signed-off-by: Lv Zheng <lv.zheng@...el.com>
Signed-off-by: Bob Moore <robert.moore@...el.com>
---
 drivers/acpi/acpica/psxface.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/acpi/acpica/psxface.c b/drivers/acpi/acpica/psxface.c
index 8d7e5b5..f3c8726 100644
--- a/drivers/acpi/acpica/psxface.c
+++ b/drivers/acpi/acpica/psxface.c
@@ -305,6 +305,17 @@ acpi_status acpi_ps_execute_table(struct acpi_evaluate_info *info)
 		walk_state->parse_flags |= ACPI_PARSE_MODULE_LEVEL;
 	}
 
+	/* Info->Node is the default location to load the table  */
+
+	if (info->node && info->node != acpi_gbl_root_node) {
+		status =
+		    acpi_ds_scope_stack_push(info->node, ACPI_TYPE_METHOD,
+					     walk_state);
+		if (ACPI_FAILURE(status)) {
+			goto cleanup;
+		}
+	}
+
 	/*
 	 * Parse the AML, walk_state will be deleted by parse_aml
 	 */
-- 
1.7.10