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drm/amdgpu: fix num_ibs check 

Specifying no IBs on command submission is invalid, stop crashing
badly when somebody tries it.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucer@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-01-31 11:32:04 +01:00 committed by Alex Deucher
parent 867d0517c7
commit 4acabfe379
1 changed files with 5 additions and 11 deletions
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16
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
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@ -211,6 +211,10 @@ int amdgpu_cs_parser_init(struct amdgpu_cs_parser *p, void *data)
}
}
if (p->num_ibs == 0) {
ret = -EINVAL;
goto free_all_kdata;
}
p->ibs = kcalloc(p->num_ibs, sizeof(struct amdgpu_ib), GFP_KERNEL);
if (!p->ibs) {
@ -551,9 +555,6 @@ static int amdgpu_cs_ib_vm_chunk(struct amdgpu_device *adev,
struct amdgpu_ring *ring;
int i, r;
if (parser->num_ibs == 0)
return 0;
/* Only for UVD/VCE VM emulation */
for (i = 0; i < parser->num_ibs; i++) {
ring = parser->ibs[i].ring;
@ -660,9 +661,6 @@ static int amdgpu_cs_ib_fill(struct amdgpu_device *adev,
j++;
}
if (!parser->num_ibs)
return 0;
/* add GDS resources to first IB */
if (parser->bo_list) {
struct amdgpu_bo *gds = parser->bo_list->gds_obj;
@ -705,9 +703,6 @@ static int amdgpu_cs_dependencies(struct amdgpu_device *adev,
struct amdgpu_ib *ib;
int i, j, r;
if (!p->num_ibs)
return 0;
/* Add dependencies to first IB */
ib = &p->ibs[0];
for (i = 0; i < p->nchunks; ++i) {
@ -866,8 +861,7 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
if (r)
goto out;
if (parser.num_ibs)
r = amdgpu_cs_submit(&parser, cs);
r = amdgpu_cs_submit(&parser, cs);
out:
amdgpu_cs_parser_fini(&parser, r, reserved_buffers);