From: Brian Norris briannorris@chromium.org
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: stable@vger.kernel.org Signed-off-by: Brian Norris briannorris@chromium.org Signed-off-by: Heiko Stuebner heiko@sntech.de Link: https://patchwork.freedesktop.org/patch/msgid/20221019170255.2.I6b985b0ca372... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c @@ -1286,5 +1286,11 @@ struct platform_driver dw_mipi_dsi_rockc .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, }, };