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Subject: Re: [PATCH 2/4] drm/meson: Unbind all connectors on module removal
To:     Marc Zyngier <maz@kernel.org>, Kevin Hilman <khilman@baylibre.com>
Cc:     Jerome Brunet <jbrunet@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        kernel-team@android.com, dri-devel@lists.freedesktop.org,
        linux-amlogic@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
References: <20201116200744.495826-1-maz@kernel.org>
 <20201116200744.495826-3-maz@kernel.org>
From:   Neil Armstrong <narmstrong@baylibre.com>
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Organization: Baylibre
Message-ID: <56a8ea19-fb89-8430-032d-774c89a66ae7@baylibre.com>
Date:   Tue, 17 Nov 2020 09:53:59 +0100
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In-Reply-To: <20201116200744.495826-3-maz@kernel.org>
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On 16/11/2020 21:07, Marc Zyngier wrote:
> 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.
> 
> Signed-off-by: Marc Zyngier <maz@kernel.org>

Fixes: 2d8f92897ad8 ("drm/meson: Uninstall IRQ handler")

> ---
>  drivers/gpu/drm/meson/meson_drv.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/meson/meson_drv.c b/drivers/gpu/drm/meson/meson_drv.c
> index 324fa489f1c4..3d1de9cbb1c8 100644
> --- a/drivers/gpu/drm/meson/meson_drv.c
> +++ b/drivers/gpu/drm/meson/meson_drv.c
> @@ -390,8 +390,10 @@ static void meson_drv_unbind(struct device *dev)
>  	}
>  
>  	drm_dev_unregister(drm);
> -	drm_irq_uninstall(drm);
>  	drm_kms_helper_poll_fini(drm);
> +	drm_atomic_helper_shutdown(drm);
> +	component_unbind_all(dev, drm);
> +	drm_irq_uninstall(drm);
>  	drm_dev_put(drm);
>  
>  	if (priv->afbcd.ops) {
> 

Acked-by: Neil Armstrong <narmstrong@baylibre.com>