Quoting Nicolas Saenz Julienne (2020-12-11 08:47:50)

When unbinding the firmware device we need to make sure it has no
consumers left. Otherwise we'd leave them with a firmware handle
pointing at freed memory.

Keep a reference count of all consumers and introduce rpi_firmware_put()
which will permit automatically decrease the reference count upon
unbinding consumer drivers.

Suggested-by: Uwe Kleine-König <redacted>
Signed-off-by: Nicolas Saenz Julienne <redacted>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>

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Reviewed-by: Stephen Boyd <sboyd@kernel.org>