linux-kernel - [PATCH] drm/amd/display: Use memset to initialize variable in wait_for_training_aux_rd

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Date:   Fri,  1 Feb 2019 13:15:41 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>
Cc:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        John Barberiz <John.Barberiz@....com>,
        Wenjing Liu <Wenjing.Liu@....com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>
Subject: [PATCH] drm/amd/display: Use memset to initialize variable in wait_for_training_aux_rd_interval

Clang warns:

drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link_dp.c:50:57:
warning: suggest braces around initialization of subobject
[-Wmissing-braces]
        union training_aux_rd_interval training_rd_interval = {0};
                                                               ^
                                                               {}
1 warning generated.

Previous efforts to fix this type of warning by adding or removing
braces have been met with some pushback in favor of using memset [1][2].
Do that here, mirroring commit 05794eff1aa6 ("drm/amdgpu/gmc: fix
compiler errors [-Werror,-Wmissing-braces] (V2)") in this tree.

[1]: https://lore.kernel.org/lkml/022e41c0-8465-dc7a-a45c-64187ecd9684@amd.com/
[2]: https://lore.kernel.org/lkml/20181128.215241.702406654469517539.davem@davemloft.net/

Fixes: 3cec41769d21 ("drm/amd/display: Fix use of uninitialized union")
Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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 92f565ca1260..5ee36d6e0512 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
@@ -47,7 +47,9 @@ static void wait_for_training_aux_rd_interval(
 	struct dc_link *link,
 	uint32_t default_wait_in_micro_secs)
 {
-	union training_aux_rd_interval training_rd_interval = {0};
+	union training_aux_rd_interval training_rd_interval;
+
+	memset(&training_rd_interval, 0, sizeof(training_rd_interval));
 
 	/* overwrite the delay if rev > 1.1*/
 	if (link->dpcd_caps.dpcd_rev.raw >= DPCD_REV_12) {
-- 
2.20.1