2021-06-17 02:50:08

by Pu Lehui

Subject: [PATCH -next] drm/amd/display: Fix gcc unused variable warning

GCC reports the following warning with W=1:

drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:3635:17:
warning:
variable ‘status’ set but not used [-Wunused-but-set-variable]
3635 | enum dc_status status = DC_ERROR_UNEXPECTED;
| ^~~~~~

The variable should be used for error check, let's fix it.

Signed-off-by: Pu Lehui <[email protected]>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index fcb635c85330..cf29265870c8 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -3681,6 +3681,10 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link)
DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
lttpr_dpcd_data,
sizeof(lttpr_dpcd_data));
+ if (status != DC_OK) {
+ dm_error("%s: Read LTTPR caps data failed.\n", __func__);
+ return false;
+ }

link->dpcd_caps.lttpr_caps.revision.raw =
lttpr_dpcd_data[DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV -
--
2.17.1

2021-06-17 23:49:46

by Harry Wentland

Subject: Re: [PATCH -next] drm/amd/display: Fix gcc unused variable warning

On 2021-06-16 10:31 p.m., Pu Lehui wrote:
> GCC reports the following warning with W=1:
>
> drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:3635:17:
> warning:
> variable ‘status’ set but not used [-Wunused-but-set-variable]
> 3635 | enum dc_status status = DC_ERROR_UNEXPECTED;
> | ^~~~~~
>
> The variable should be used for error check, let's fix it.
>
> Signed-off-by: Pu Lehui <[email protected]>

Reviewed-by: Harry Wentland <[email protected]>

Harry

> ---
> drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> index fcb635c85330..cf29265870c8 100644
> --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> @@ -3681,6 +3681,10 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link)
> DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
> lttpr_dpcd_data,
> sizeof(lttpr_dpcd_data));
> + if (status != DC_OK) {
> + dm_error("%s: Read LTTPR caps data failed.\n", __func__);
> + return false;
> + }
>
> link->dpcd_caps.lttpr_caps.revision.raw =
> lttpr_dpcd_data[DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV -
>

2021-06-19 03:49:46

by Alex Deucher

Subject: Re: [PATCH -next] drm/amd/display: Fix gcc unused variable warning

Applied. Thanks!

Alex

On Thu, Jun 17, 2021 at 2:43 PM Harry Wentland <[email protected]> wrote:
>
> On 2021-06-16 10:31 p.m., Pu Lehui wrote:
> > GCC reports the following warning with W=1:
> >
> > drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:3635:17:
> > warning:
> > variable ‘status’ set but not used [-Wunused-but-set-variable]
> > 3635 | enum dc_status status = DC_ERROR_UNEXPECTED;
> > | ^~~~~~
> >
> > The variable should be used for error check, let's fix it.
> >
> > Signed-off-by: Pu Lehui <[email protected]>
>
> Reviewed-by: Harry Wentland <[email protected]>
>
> Harry
>
> > ---
> > drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> > index fcb635c85330..cf29265870c8 100644
> > --- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> > +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
> > @@ -3681,6 +3681,10 @@ bool dp_retrieve_lttpr_cap(struct dc_link *link)
> > DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV,
> > lttpr_dpcd_data,
> > sizeof(lttpr_dpcd_data));
> > + if (status != DC_OK) {
> > + dm_error("%s: Read LTTPR caps data failed.\n", __func__);
> > + return false;
> > + }
> >
> > link->dpcd_caps.lttpr_caps.revision.raw =
> > lttpr_dpcd_data[DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV -
> >
>
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