[PATCH] drm/sun4i: Fix crash during suspend after component bind failure

[Maxime Ripard]

Hi,

On Wed, Jun 15, 2022 at 12:42:53AM -0500, Samuel Holland wrote:
> If the component driver fails to bind, or is unbound, the driver data
> for the top-level platform device points to a freed drm_device. If the
> system is then suspended, the driver passes this dangling pointer to
> drm_mode_config_helper_suspend(), which crashes.
> 
> Fix this by only setting the driver data while the platform driver holds
> a reference to the drm_device.
> 
> Fixes: 624b4b48d9d8 ("drm: sun4i: Add support for suspending the display driver")
> Signed-off-by: Samuel Holland <samuel at sholland.org>

Yeah, it's far from the only issue regarding structure lifetimes in the
driver.

We should convert as much as possible to the DRM-managed functions to
fix those.

Maxime
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