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drm/amdkfd: check find_first_zero_bit before __set_bit on kfd->doorbell_bitmap

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If inx from find_first_zero_bit is beyond range not need set doorbell_bitmap.

Signed-off-by: Xiaogang Chen <xiaogang.chen@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 2664ce9143d174651a793d96a6a2326050c4f45a)
This commit is contained in:
Xiaogang Chen 2026-06-16 12:54:49 -05:00 committed by Alex Deucher
parent 8242a8d9d7
commit 516bf737a5
1 changed files with 5 additions and 3 deletions
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8
drivers/gpu/drm/amd/amdkfd/kfd_doorbell.c
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@ -153,14 +153,16 @@ void __iomem *kfd_get_kernel_doorbell(struct kfd_dev *kfd,
u32 inx;
mutex_lock(&kfd->doorbell_mutex);
inx = find_first_zero_bit(kfd->doorbell_bitmap, PAGE_SIZE / sizeof(u32));
if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS) {
mutex_unlock(&kfd->doorbell_mutex);
return NULL;
}
__set_bit(inx, kfd->doorbell_bitmap);
mutex_unlock(&kfd->doorbell_mutex);
if (inx >= KFD_MAX_NUM_OF_QUEUES_PER_PROCESS)
return NULL;
*doorbell_off = amdgpu_doorbell_index_on_bar(kfd->adev,
kfd->doorbells,
inx,