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gpu: nvgpu: pd_cache: add BUG_ON to guard divide by 0

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In the unlikely event of a corruption of pentry->pd_size this new
BUG_ON prevents a potential divide by 0. This change is mostly to
increase safety as it is unlikely for a divide by 0 to occur in this
instance.

JIRA NVGPU-4949

Change-Id: Ibdf80670f35a63dd20d06082cde23fb424931933
Signed-off-by: Nicolas Benech <nbenech@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2291022
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Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
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This commit is contained in:
Nicolas Benech
2020-02-06 10:39:50 -05:00
committed by Alex Waterman
parent 8366e2980d
commit 16b80d2c5c
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/nvgpu/common/mm/gmmu/pd_cache.c
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@@ -60,6 +60,8 @@ static u32 nvgpu_pd_cache_nr(u32 bytes)
static u32 nvgpu_pd_cache_get_nr_entries(struct nvgpu_pd_mem_entry *pentry)
{
BUG_ON(pentry->pd_size == 0);
return PAGE_SIZE / pentry->pd_size;
}