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e78ad18ba3
Removing the meson DRM module results in the following splats:
[ 42.689228] WARNING: CPU: 0 PID: 572 at drivers/gpu/drm/drm_irq.c:192 drm_irq_uninstall+0x130/0x160 [drm]
[...]
[ 42.812820] Hardware name: , BIOS 2021.01-rc2-00012-gde865f7ee1 11/16/2020
[ 42.819723] pstate: 80400089 (Nzcv daIf +PAN -UAO -TCO BTYPE=--)
[ 42.825737] pc : drm_irq_uninstall+0x130/0x160 [drm]
[ 42.830647] lr : drm_irq_uninstall+0xc4/0x160 [drm]
[...]
[ 42.917614] Call trace:
[ 42.920086] drm_irq_uninstall+0x130/0x160 [drm]
[ 42.924612] meson_drv_unbind+0x68/0xa4 [meson_drm]
[ 42.929436] component_del+0xc0/0x180
[ 42.933058] meson_dw_hdmi_remove+0x28/0x40 [meson_dw_hdmi]
[ 42.938576] platform_drv_remove+0x38/0x60
[ 42.942628] __device_release_driver+0x190/0x23c
[ 42.947198] driver_detach+0xcc/0x160
[ 42.950822] bus_remove_driver+0x68/0xe0
[ 42.954702] driver_unregister+0x3c/0x6c
[ 42.958583] platform_driver_unregister+0x20/0x2c
[ 42.963243] meson_dw_hdmi_platform_driver_exit+0x18/0x4a8 [meson_dw_hdmi]
[ 42.970057] __arm64_sys_delete_module+0x1bc/0x294
[ 42.974801] el0_svc_common.constprop.0+0x80/0x240
[ 42.979542] do_el0_svc+0x30/0xa0
[ 42.982821] el0_svc+0x18/0x50
[ 42.985839] el0_sync_handler+0x198/0x404
[ 42.989806] el0_sync+0x158/0x180
immediatelly followed by
[ 43.002296] WARNING: CPU: 0 PID: 572 at drivers/gpu/drm/drm_mode_config.c:504 drm_mode_config_cleanup+0x2a8/0x304 [drm]
[...]
[ 43.128150] Hardware name: , BIOS 2021.01-rc2-00012-gde865f7ee1 11/16/2020
[ 43.135052] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO BTYPE=--)
[ 43.141062] pc : drm_mode_config_cleanup+0x2a8/0x304 [drm]
[ 43.146492] lr : drm_mode_config_cleanup+0xac/0x304 [drm]
[...]
[ 43.233979] Call trace:
[ 43.236451] drm_mode_config_cleanup+0x2a8/0x304 [drm]
[ 43.241538] drm_mode_config_init_release+0x1c/0x2c [drm]
[ 43.246886] drm_managed_release+0xa8/0x120 [drm]
[ 43.251543] drm_dev_put+0x94/0xc0 [drm]
[ 43.255380] meson_drv_unbind+0x78/0xa4 [meson_drm]
[ 43.260204] component_del+0xc0/0x180
[ 43.263829] meson_dw_hdmi_remove+0x28/0x40 [meson_dw_hdmi]
[ 43.269344] platform_drv_remove+0x38/0x60
[ 43.273398] __device_release_driver+0x190/0x23c
[ 43.277967] driver_detach+0xcc/0x160
[ 43.281590] bus_remove_driver+0x68/0xe0
[ 43.285471] driver_unregister+0x3c/0x6c
[ 43.289352] platform_driver_unregister+0x20/0x2c
[ 43.294011] meson_dw_hdmi_platform_driver_exit+0x18/0x4a8 [meson_dw_hdmi]
[ 43.300826] __arm64_sys_delete_module+0x1bc/0x294
[ 43.305570] el0_svc_common.constprop.0+0x80/0x240
[ 43.310312] do_el0_svc+0x30/0xa0
[ 43.313590] el0_svc+0x18/0x50
[ 43.316608] el0_sync_handler+0x198/0x404
[ 43.320574] el0_sync+0x158/0x180
[ 43.323852] ---[ end trace d796a3072dab01da ]---
[ 43.328561] [drm:drm_mode_config_cleanup [drm]] *ERROR* connector HDMI-A-1 leaked!
both triggered by the fact that the HDMI subsystem is still active,
and the DRM removal doesn't result in the connectors being torn down.
Call drm_atomic_helper_shutdown() and component_unbind_all() to safely
tear the module down.
Fixes: 2d8f92897a ("drm/meson: Uninstall IRQ handler")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201116200744.495826-3-maz@kernel.org
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.