This is a note to let you know that I've just added the patch titled drm/rockchip: dsi: Force synchronous probe to the 5.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-rockchip-dsi-force-synchronous-probe.patch and it can be found in the queue-5.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 81e592f86f7afdb76d655e7fbd7803d7b8f985d8 Mon Sep 17 00:00:00 2001 From: Brian Norris <briannorris@xxxxxxxxxxxx> Date: Wed, 19 Oct 2022 17:03:49 -0700 Subject: drm/rockchip: dsi: Force synchronous probe From: Brian Norris <briannorris@xxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx> Signed-off-by: Brian Norris <briannorris@xxxxxxxxxxxx> Signed-off-by: Heiko Stuebner <heiko@xxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20221019170255.2.I6b985b0ca372b7e35c6d9ea970b24bcb262d4fc1@changeid Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -1123,5 +1123,11 @@ 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, }, }; Patches currently in stable-queue which might be from briannorris@xxxxxxxxxxxx are queue-5.4/drm-rockchip-dsi-force-synchronous-probe.patch