drm/amd/display: Fixed kernel panic when booting with DP-to-HDMI dongle
authorDavid Galiffi <David.Galiffi@amd.com>
Thu, 7 Nov 2019 22:18:20 +0000 (17:18 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 9 Jan 2020 09:18:55 +0000 (10:18 +0100)
commit12fefecbcb4dfefd62995fd0e4cf8f30edd64926
tree5e3420de77b3240383fed3fd5c2fa03fa6acef92
parenta073ae477701fd19e73e4285199cfc419ebd94b8
drm/amd/display: Fixed kernel panic when booting with DP-to-HDMI dongle

[ Upstream commit a51d9f8fe756beac51ce26ef54195da00a260d13 ]

[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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/gpu/drm/amd/display/dc/core/dc_link.c