Re: [PATCH] drm/amdgpu/display: initialize the variable 'i'

Alex Deucher
2021-02-23T17:43:06Z

yeah, fdo ran out of disk space so I moved to gitlab:
https://gitlab.freedesktop.org/agd5f/linux/-/commits/drm-next

Alex

On Mon, Feb 22, 2021 at 7:26 PM Bas Nieuwenhuizen
<bas@basnieuwenhuizen.nl> wrote:
>
> I think Alex moved to gitlab for his branches
>
> On Tue, Feb 23, 2021, 12:50 AM Simon Ser <contact@emersion.fr> wrote:
>>
>> On Tuesday, February 23rd, 2021 at 12:44 AM, Nathan Chancellor <nathan@kernel.org> wrote:
>>
>> > On Mon, Feb 22, 2021 at 11:05:17PM +0000, Simon Ser wrote:
>> > > On Monday, February 22nd, 2021 at 8:25 PM, Souptick Joarder <jrdr.linux@gmail.com> wrote:
>> > >
>> > > > >> drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9804:38:
>> > > > >> warning: variable 'i' is uninitialized when used here
>> > > > >> [-Wuninitialized]
>> > > > timing = &edid->detailed_timings[i];
>> > > > ^
>> > > > drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:9714:7:
>> > > > note: initialize the variable 'i' to silence this warning
>> > > > int i;
>> > > > ^
>> > > > = 0
>> > > > 1 warning generated.
>> > > >
>> > > > Initialize the variable 'i'.
>> > >
>> > > Hm, I see this variable already initialized in the loop:
>> > >
>> > > for (i = 0; i < 4; i++) {
>> > >
>> > > This is the branch agd5f/drm-next.
>> >
>> > That is in the
>> >
>> > if (amdgpu_dm_connector->dc_sink->sink_signal == SIGNAL_TYPE_DISPLAY_PORT
>> > || amdgpu_dm_connector->dc_sink->sink_signal == SIGNAL_TYPE_EDP) {
>> >
>> > branch not the
>> >
>> > } else if (edid && amdgpu_dm_connector->dc_sink->sink_signal == SIGNAL_TYPE_HDMI_TYPE_A) {
>> >
>> > branch, where i is indeed used uninitialized like clang complains about.
>> >
>> > I am not at all familiar with the code so I cannot say if this fix is
>> > the proper one but it is definitely a legitimate issue.
>>
>> I think you have an outdated branch. In my checkout, i is not used in the first
>> branch, and is initialized in the second one.
>>
>> https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c?h=drm-next#n9700
>
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