From 2219b6aad345cc393e275d06f2bab9836fa495c6 Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Wed, 19 Oct 2022 17:03:49 -0700 Subject: [PATCH] drm/rockchip: dsi: Force synchronous probe commit 81e592f86f7afdb76d655e7fbd7803d7b8f985d8 upstream. We can't safely probe a dual-DSI display asynchronously (driver_async_probe='*' or driver_async_probe='dw-mipi-dsi-rockchip' cmdline), because dw_mipi_dsi_rockchip_find_second() pokes one DSI device's drvdata from the other device without any locking. Request synchronous probe, at least until this driver learns some appropriate locking for dual-DSI initialization. Cc: Signed-off-by: Brian Norris Signed-off-by: Heiko Stuebner Link: https://patchwork.freedesktop.org/patch/msgid/20221019170255.2.I6b985b0ca372b7e35c6d9ea970b24bcb262d4fc1@changeid Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c index 386dbba864b6..1129f98fe7f9 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c @@ -1638,5 +1638,11 @@ struct platform_driver dw_mipi_dsi_rockchip_driver = { .of_match_table = dw_mipi_dsi_rockchip_dt_ids, .pm = &dw_mipi_dsi_rockchip_pm_ops, .name = "dw-mipi-dsi-rockchip", + /* + * For dual-DSI display, one DSI pokes at the other DSI's + * drvdata in dw_mipi_dsi_rockchip_find_second(). This is not + * safe for asynchronous probe. + */ + .probe_type = PROBE_FORCE_SYNCHRONOUS, }, };