linux-kernel - [PATCH 18/30] drm/amd/display/dc/core/dc_link: Move some local data from the stack to the heap

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Date:   Wed, 13 Jan 2021 08:07:40 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     lee.jones@...aro.org
Cc:     linux-kernel@...r.kernel.org,
        Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH 18/30] drm/amd/display/dc/core/dc_link: Move some local data from the stack to the heap

Fixes the following W=1 kernel build warning(s):

 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link.c: In function ‘dc_link_construct’:
 drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link.c:1588:1: warning: the frame size of 1176 bytes is larger than 1024 bytes [-Wframe-larger-than=]

Cc: Harry Wentland <harry.wentland@....com>
Cc: Leo Li <sunpeng.li@....com>
Cc: Alex Deucher <alexander.deucher@....com>
Cc: "Christian König" <christian.koenig@....com>
Cc: David Airlie <airlied@...ux.ie>
Cc: Daniel Vetter <daniel@...ll.ch>
Cc: amd-gfx@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/gpu/drm/amd/display/dc/core/dc_link.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 8ccda8b9ac2eb..3366a49f11dc7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1364,13 +1364,17 @@ static bool dc_link_construct(struct dc_link *link,
 	struct dc_context *dc_ctx = init_params->ctx;
 	struct encoder_init_data enc_init_data = { 0 };
 	struct panel_cntl_init_data panel_cntl_init_data = { 0 };
-	struct integrated_info info = {{{ 0 }}};
+	struct integrated_info *info;
 	struct dc_bios *bios = init_params->dc->ctx->dc_bios;
 	const struct dc_vbios_funcs *bp_funcs = bios->funcs;
 	struct bp_disp_connector_caps_info disp_connect_caps_info = { 0 };
 
 	DC_LOGGER_INIT(dc_ctx->logger);
 
+	info = kzalloc(sizeof(info), GFP_KERNEL);
+	if (!info)
+		goto create_fail;
+
 	link->irq_source_hpd = DC_IRQ_SOURCE_INVALID;
 	link->irq_source_hpd_rx = DC_IRQ_SOURCE_INVALID;
 
@@ -1532,12 +1536,12 @@ static bool dc_link_construct(struct dc_link *link,
 	}
 
 	if (bios->integrated_info)
-		info = *bios->integrated_info;
+		memcpy(info, bios->integrated_info, sizeof(*info));
 
 	/* Look for channel mapping corresponding to connector and device tag */
 	for (i = 0; i < MAX_NUMBER_OF_EXT_DISPLAY_PATH; i++) {
 		struct external_display_path *path =
-			&info.ext_disp_conn_info.path[i];
+			&info->ext_disp_conn_info.path[i];
 
 		if (path->device_connector_id.enum_id == link->link_id.enum_id &&
 		    path->device_connector_id.id == link->link_id.id &&
@@ -1584,6 +1588,8 @@ static bool dc_link_construct(struct dc_link *link,
 		link->hpd_gpio = NULL;
 	}
 
+	kfree(info);
+
 	return false;
 }
 
-- 
2.25.1