[Public]
> -----Original Message-----
> From: Alex Deucher <alexdeucher@xxxxxxxxx>
> Sent: Monday, January 9, 2023 10:04
> To: SHANMUGAM, SRINIVASAN <SRINIVASAN.SHANMUGAM@xxxxxxx>
> Cc: Wentland, Harry <Harry.Wentland@xxxxxxx>; Deucher, Alexander
> <Alexander.Deucher@xxxxxxx>; Koenig, Christian
> <Christian.Koenig@xxxxxxx>; amd-gfx@xxxxxxxxxxxxxxxxxxxxx; Limonciello,
> Mario <Mario.Limonciello@xxxxxxx>
> Subject: Re: [PATCH v2] drm/amd/amdgpu: Fix an uninitialized variable
>
> On Mon, Jan 9, 2023 at 10:58 AM Srinivasan Shanmugam
> <srinivasan.shanmugam@xxxxxxx> wrote:
> >
> > CC drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.o
> > drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c:217:71: error: variable 'i' is
> uninitialized when used here [-Werror,-Wuninitialized]
> > snprintf(fw_name, sizeof(fw_name), "amdgpu/%s%d.bin",
> ucode_prefix, i);
> > ^
> > drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c:207:16: note: initialize the
> variable 'i' to silence this warning
> > int err = 0, i;
> > ^
> > = 0
> >
> > As suggested by Christian, buggy
> > "snprintf(fw_name, sizeof(fw_name), "amdgpu/%s%d.bin", ucode_prefix,
> i);"
> > shouldn't be "i" in the first place, but rather using "instance",
> > because for instance greater than 0, we want to have different
> > sdma firmware for different instance we add the instance number.
> >
> > Remove setting err to 0 as well. This is considered very bad coding style.
> >
> > Cc: Christian König <christian.koenig@xxxxxxx>
> > Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
> > Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> > Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
>
> Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
Thanks for the fix!
Reviewed-by: Mario Limonciello <mario.limonciello@xxxxxxx>
>
> > Change-Id: I2f1180af4f37bf1efd4d47e7bf64425b0b3809fb
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> > index 0e1e2521fe25a..e9b78739b9ff7 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sdma.c
> > @@ -204,7 +204,7 @@ int amdgpu_sdma_init_microcode(struct
> amdgpu_device *adev,
> > {
> > struct amdgpu_firmware_info *info = NULL;
> > const struct common_firmware_header *header = NULL;
> > - int err = 0, i;
> > + int err, i;
> > const struct sdma_firmware_header_v2_0 *sdma_hdr;
> > uint16_t version_major;
> > char ucode_prefix[30];
> > @@ -214,7 +214,7 @@ int amdgpu_sdma_init_microcode(struct
> amdgpu_device *adev,
> > if (instance == 0)
> > snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin",
> ucode_prefix);
> > else
> > - snprintf(fw_name, sizeof(fw_name), "amdgpu/%s%d.bin",
> ucode_prefix, i);
> > + snprintf(fw_name, sizeof(fw_name), "amdgpu/%s%d.bin",
> ucode_prefix, instance);
> > err = amdgpu_ucode_request(adev, &adev-
> >sdma.instance[instance].fw, fw_name);
> > if (err)
> > goto out;
> > --
> > 2.25.1
> >
