linux-kernel - [PATCH 78/83] hsa/radeon: Don't verify cksum when parsing CRAT table

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Date:	Fri, 11 Jul 2014 00:54:34 +0300
From:	Oded Gabbay <oded.gabbay@...il.com>
To:	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexander.deucher@....com>,
	Jerome Glisse <j.glisse@...il.com>
Cc:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	John Bridgman <John.Bridgman@....com>,
	Andrew Lewycky <Andrew.Lewycky@....com>,
	Joerg Roedel <joro@...tes.org>,
	Oded Gabbay <oded.gabbay@....com>
Subject: [PATCH 78/83] hsa/radeon: Don't verify cksum when parsing CRAT table

This patch removes the checksum verification done when
parsing a CRAT table. The verification was both erronous and
redundant, as it is done by another piece of kernel code.

Signed-off-by: Oded Gabbay <oded.gabbay@....com>
---
 drivers/gpu/hsa/radeon/kfd_topology.c | 29 ++---------------------------
 1 file changed, 2 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/hsa/radeon/kfd_topology.c b/drivers/gpu/hsa/radeon/kfd_topology.c
index d3aaad1..b686b7e 100644
--- a/drivers/gpu/hsa/radeon/kfd_topology.c
+++ b/drivers/gpu/hsa/radeon/kfd_topology.c
@@ -38,21 +38,6 @@ static struct kfd_system_properties sys_props;
 
 static DECLARE_RWSEM(topology_lock);
 
-
-static uint8_t checksum_image(const void *buf, size_t len)
-{
-	uint8_t *p = (uint8_t *)buf;
-	uint8_t sum = 0;
-
-	if (!buf)
-		return 0;
-
-	while (len-- > 0)
-		sum += *p++;
-
-	return sum;
-		}
-
 struct kfd_dev *radeon_kfd_device_by_id(uint32_t gpu_id)
 {
 	struct kfd_topology_device *top_dev;
@@ -97,9 +82,9 @@ static int kfd_topology_get_crat_acpi(void *crat_image, size_t *size)
 	if (!size)
 		return -EINVAL;
 
-/*
+	/*
 	 * Fetch the CRAT table from ACPI
- */
+	 */
 	status = acpi_get_table(CRAT_SIGNATURE, 0, &crat_table);
 	if (status == AE_NOT_FOUND) {
 		pr_warn("CRAT table not found\n");
@@ -111,16 +96,6 @@ static int kfd_topology_get_crat_acpi(void *crat_image, size_t *size)
 		return -EINVAL;
 	}
 
-	/*
-	 * The checksum of the table should be verified
-	 */
-	if (checksum_image(crat_table, crat_table->length) ==
-		crat_table->checksum) {
-		pr_err("Bad checksum for the CRAT table\n");
-		return -EINVAL;
-}
-
-
 	if (*size >= crat_table->length && crat_image != 0)
 		memcpy(crat_image, crat_table, crat_table->length);
 
-- 
1.9.1

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