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From: Aubrey Li <aubrey.li@intel.com>
To: rjw@rjwysocki.net, pmenzel@molgen.mpg.de
Cc: linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org,
	Aubrey Li <aubrey.li@intel.com>,
	Aubrey Li <aubrey.li@linux.intel.com>
Subject: [PATCH] ACPI/PRM: Find PRMT table before parse it
Date: Wed,  8 Sep 2021 10:09:44 +0800	[thread overview]
Message-ID: <1631066984-63501-1-git-send-email-aubrey.li@intel.com> (raw)

Find and verify PRMT table before parse it, this eliminates a
warning on machines without PRMT table.

	[    7.197173] ACPI: PRMT not present

Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com>
Tested-by: Paul Menzel <pmenzel@molgen.mpg.de>
---
 drivers/acpi/prmt.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
index 1f6007a..89c22bc 100644
--- a/drivers/acpi/prmt.c
+++ b/drivers/acpi/prmt.c
@@ -288,10 +288,18 @@ static acpi_status acpi_platformrt_space_handler(u32 function,
 
 void __init init_prmt(void)
 {
+	struct acpi_table_header *tbl;
 	acpi_status status;
-	int mc = acpi_table_parse_entries(ACPI_SIG_PRMT, sizeof(struct acpi_table_prmt) +
+	int mc;
+
+	status = acpi_get_table(ACPI_SIG_PRMT, 0, &tbl);
+	if (ACPI_FAILURE(status))
+		return;
+
+	mc = acpi_table_parse_entries(ACPI_SIG_PRMT, sizeof(struct acpi_table_prmt) +
 					  sizeof (struct acpi_table_prmt_header),
 					  0, acpi_parse_prmt, 0);
+	acpi_put_table(tbl);
 	/*
 	 * Return immediately if PRMT table is not present or no PRM module found.
 	 */
-- 
2.7.4


             reply	other threads:[~2021-09-08  2:14 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-08  2:09 Aubrey Li [this message]
2021-09-08 10:06 ` [PATCH] ACPI/PRM: Find PRMT table before parse it Paul Menzel

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