[AMD Official Use Only - General]
Hi Christian,
-----Original Message-----
From: Koenig, Christian <Christian.Koenig@xxxxxxx>
Sent: Tuesday, April 23, 2024 3:43 PM
To: Huang, Tim <Tim.Huang@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>
Subject: Re: [PATCH] drm/amdgpu: fix uninitialized scalar variable warning
Am 23.04.24 um 08:28 schrieb Tim Huang:
> Clear warning that uses uninitialized value fw_size.
> In which case is the fw_size uninitialized and why setting it to zero helps in that case?
It's a warning that reported by the Coverity scan. When the switch case " switch (ucode_id) " got to default and Condition "adev->firmware.load_type == AMDGPU_FW_LOAD_PSP", taking true branch,
it reports " uses uninitialized value fw_size " by this line.
"adev->firmware.fw_size += ALIGN(fw_size, PAGE_SIZE);“
It may not happen if we call this function correctly, but it just clears the warning and looks harmless.
Regards,
Christian.
>
> Signed-off-by: Tim Huang <Tim.Huang@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> index d95555dc5485..6b8a58f501d3 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c
> @@ -1084,7 +1084,7 @@ void amdgpu_gfx_cp_init_microcode(struct amdgpu_device *adev,
> const struct gfx_firmware_header_v2_0 *cp_hdr_v2_0;
> struct amdgpu_firmware_info *info = NULL;
> const struct firmware *ucode_fw;
> - unsigned int fw_size;
> + unsigned int fw_size = 0;
>
> switch (ucode_id) {
> case AMDGPU_UCODE_ID_CP_PFP:
