linux-kernel - [PATCH] drm/amdkfd: Put ACPI table after using it

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Date:   Wed, 22 Jul 2020 17:48:28 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     <linux-kernel@...r.kernel.org>, Hanjun Guo <guohanjun@...wei.com>
Subject: [PATCH] drm/amdkfd: Put ACPI table after using it

The acpi_get_table() should be coupled with acpi_put_table() if
the mapped table is not used at runtime to release the table
mapping.

In kfd_create_crat_image_acpi(), crat_table is copied to pcrat_image,
and in kfd_create_vcrat_image_cpu(), the acpi_table is only used to
get the OEM info, so those table mappings need to be release after
using it.

Signed-off-by: Hanjun Guo <guohanjun@...wei.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
index 1009a3b..d378e61 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -756,6 +756,7 @@ int kfd_create_crat_image_acpi(void **crat_image, size_t *size)
 	struct acpi_table_header *crat_table;
 	acpi_status status;
 	void *pcrat_image;
+	int rc = 0;
 
 	if (!crat_image)
 		return -EINVAL;
@@ -776,17 +777,21 @@ int kfd_create_crat_image_acpi(void **crat_image, size_t *size)
 
 	if (ignore_crat) {
 		pr_info("CRAT table disabled by module option\n");
-		return -ENODATA;
+		rc = -ENODATA;
+		goto out;
 	}
 
 	pcrat_image = kmemdup(crat_table, crat_table->length, GFP_KERNEL);
-	if (!pcrat_image)
-		return -ENOMEM;
+	if (!pcrat_image) {
+		rc = -ENOMEM;
+		goto out;
+	}
 
 	*crat_image = pcrat_image;
 	*size = crat_table->length;
-
-	return 0;
+out:
+	acpi_put_table(crat_table);
+	return rc;
 }
 
 /* Memory required to create Virtual CRAT.
@@ -970,6 +975,7 @@ static int kfd_create_vcrat_image_cpu(void *pcrat_image, size_t *size)
 				CRAT_OEMID_LENGTH);
 		memcpy(crat_table->oem_table_id, acpi_table->oem_table_id,
 				CRAT_OEMTABLEID_LENGTH);
+		acpi_put_table(acpi_table);
 	}
 	crat_table->total_entries = 0;
 	crat_table->num_domains = 0;
-- 
1.7.12.4