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drm/amdgpu: fix duplicated buffer allocation for concurrent

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In case of concurrent calling to the bin file writing, use the mutex
to avoid allocating the temporary buffer more than once.

Signed-off-by: Shiwu Zhang <shiwu.zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Shiwu Zhang 2026-05-13 14:45:54 +08:00 committed by Alex Deucher
parent 6229898d46
commit 2064610469
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c
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@ -4651,14 +4651,17 @@ static ssize_t amdgpu_psp_vbflash_write(struct file *filp, struct kobject *kobj,
return -ENOMEM;
}
mutex_lock(&adev->psp.mutex);
/* TODO Just allocate max for now and optimize to realloc later if needed */
if (!adev->psp.vbflash_tmp_buf) {
adev->psp.vbflash_tmp_buf = kvmalloc(AMD_VBIOS_FILE_MAX_SIZE_B, GFP_KERNEL);
if (!adev->psp.vbflash_tmp_buf)
if (!adev->psp.vbflash_tmp_buf) {
mutex_unlock(&adev->psp.mutex);
return -ENOMEM;
}
}
mutex_lock(&adev->psp.mutex);
memcpy(adev->psp.vbflash_tmp_buf + pos, buffer, count);
adev->psp.vbflash_image_size += count;
mutex_unlock(&adev->psp.mutex);