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drm/amdgpu: Off by one sanity checks

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This is just future proofing code, not something that can be triggered
in real life.  We're testing to make sure we don't shift wrap when we
do "1ull << i" so "i" has to be in the 0-63 range.  If it's 64 then we
have gone too far.

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Dan Carpenter 2017-07-11 22:53:29 +03:00 committed by Alex Deucher
parent 6d949d2473
commit 1d11ee8986
3 changed files with 3 additions and 3 deletions
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2
drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
View File

@ -4564,7 +4564,7 @@ static int gfx_v8_0_kiq_kcq_enable(struct amdgpu_device *adev)
/* This situation may be hit in the future if a new HW
* generation exposes more than 64 queues. If so, the
* definition of queue_mask needs updating */
if (WARN_ON(i > (sizeof(queue_mask)*8))) {
if (WARN_ON(i >= (sizeof(queue_mask)*8))) {
DRM_ERROR("Invalid KCQ enabled: %d\n", i);
break;
}

2
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
View File

@ -2425,7 +2425,7 @@ static int gfx_v9_0_kiq_kcq_enable(struct amdgpu_device *adev)
/* This situation may be hit in the future if a new HW
* generation exposes more than 64 queues. If so, the
* definition of queue_mask needs updating */
if (WARN_ON(i > (sizeof(queue_mask)*8))) {
if (WARN_ON(i >= (sizeof(queue_mask)*8))) {
DRM_ERROR("Invalid KCQ enabled: %d\n", i);
break;
}

2
drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
View File

@ -671,7 +671,7 @@ static int set_sched_resources(struct device_queue_manager *dqm)
/* This situation may be hit in the future if a new HW
* generation exposes more than 64 queues. If so, the
* definition of res.queue_mask needs updating */
if (WARN_ON(i > (sizeof(res.queue_mask)*8))) {
if (WARN_ON(i >= (sizeof(res.queue_mask)*8))) {
pr_err("Invalid queue enabled by amdgpu: %d\n", i);
break;
}