From: David Galiffi <David.Galiffi@amd.com>
Date: Thu, 7 Nov 2019 22:18:20 +0000 (-0500)
Subject: drm/amd/display: Fixed kernel panic when booting with DP-to-HDMI dongle
X-Git-Tag: v5.6-rc1~114^2~21^2~65
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8fb3a6363684b5f00e7b438e22fc17346711f4fa;p=thirdparty%2Fkernel%2Flinux.git

drm/amd/display: Fixed kernel panic when booting with DP-to-HDMI dongle

[Why]
In dc_link_is_dp_sink_present, if dal_ddc_open fails, then
dal_gpio_destroy_ddc is called, destroying pin_data and pin_clock. They
are created only on dc_construct, and next aux access will cause a panic.

[How]
Instead of calling dal_gpio_destroy_ddc, call dal_ddc_close.

Signed-off-by: David Galiffi <David.Galiffi@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

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 4681ca20f683a..cef8c1ba9797a 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -372,7 +372,7 @@ bool dc_link_is_dp_sink_present(struct dc_link *link)
 
 	if (GPIO_RESULT_OK != dal_ddc_open(
 		ddc, GPIO_MODE_INPUT, GPIO_DDC_CONFIG_TYPE_MODE_I2C)) {
-		dal_gpio_destroy_ddc(&ddc);
+		dal_ddc_close(ddc);
 
 		return present;
 	}