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[ Upstream commit35122495a8] "cat /sys/kernel/debug/bcm2835_thermal/regset" causes a NULL pointer dereference in bcm2835_thermal_debugfs. The driver makes use of the implementation details of the thermal framework to retrieve a pointer to its private data from a struct thermal_zone_device, and gets it wrong - leading to the crash. Instead, store its private data as the drvdata and retrieve the thermal_zone_device pointer from it. Fixes:bcb7dd9ef2("thermal: bcm2835: add thermal driver for bcm2835 SoC") Signed-off-by: Phil Elwell <phil@raspberrypi.org> Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>