Hi, On Wed, Jun 19, 2024 at 12:07:48PM GMT, Tomi Valkeinen wrote: > From: Tomi Valkeinen <tomi.valkeinen+renesas@xxxxxxxxxxxxxxxx> > > When a bridge driver uses devm_mipi_dsi_device_register_full() or > devm_mipi_dsi_attach(), the resource management is moved to devres, > which releases the resource automatically when the bridge driver is > unbound. > > However, if the DSI host goes away first, the host unregistration code > will automatically detach and unregister any DSI peripherals, without > notifying the devres about it. So when the bridge driver later is > unbound, the resources are released a second time, leading to crash. That's super surprising. mipi_dsi_device_unregister calls device_unregister, which calls device_del, which in turn calls devres_release_all. If that doesn't work like that, then it's what needs to be fixed, and not worked around in the MIPI-DSI bus. Maxime
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