linux-kernel - [PATCH] ACPI: PRM: Optimize the judgment logic for the PRM handler

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Message-ID: <tencent_FEF72BEF631815ED2479A6D1E32C34797B05@qq.com>
Date: Mon, 18 Aug 2025 22:23:23 -0400
From: shangsong <shangsong2@...mail.com>
To: "Rafael J . Wysocki" <rafael@...nel.org>
Cc: Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	shangsong2@...ovo.com
Subject: [PATCH] ACPI: PRM: Optimize the judgment logic for the PRM handler_address

From: Shang song (Lenovo) <shangsong2@...ovo.com>

If the handler_address or mapped VA is NULL, the related buffer
address and VA can be ignored.

Signed-off-by: Shang song <shangsong2@...ovo.com>
---
 drivers/acpi/prmt.c | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index be033bbb126a..3a501fcd78df 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c
@@ -150,15 +150,28 @@ acpi_parse_prmt(union acpi_subtable_headers *header, const unsigned long end)
 		th = &tm->handlers[cur_handler];
 
 		guid_copy(&th->guid, (guid_t *)handler_info->handler_guid);
+
+		/*
+		 * Print a error message if handler_address is NULL, the parse of VA also
+		 * can be skipped.
+		 */
+		if (unlikely(!handler_info->handler_address)) {
+			pr_err("Skipping handler with NULL address for GUID: %pUL",
+					(guid_t *)handler_info->handler_guid);
+			continue;
+		}
+
 		th->handler_addr =
 			(void *)efi_pa_va_lookup(&th->guid, handler_info->handler_address);
 		/*
-		 * Print a warning message if handler_addr is zero which is not expected to
-		 * ever happen.
+		 * Print a warning message and skip the parse of VA if handler_addr is zero
+		 * which is not expected to ever happen.
 		 */
-		if (unlikely(!th->handler_addr))
+		if (unlikely(!th->handler_addr)) {
 			pr_warn("Failed to find VA of handler for GUID: %pUL, PA: 0x%llx",
 				&th->guid, handler_info->handler_address);
+			continue;
+		}
 
 		th->static_data_buffer_addr =
 			efi_pa_va_lookup(&th->guid, handler_info->static_data_buffer_address);
-- 
2.43.7