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Geert Uytterhoeven authored
When calling soc_device_match() from early_initcall(), bus_kset is still NULL, causing a crash: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028 ... Call trace: __lock_acquire+0x530/0x20f0 lock_acquire.part.0+0xc8/0x210 lock_acquire+0x64/0x80 _raw_spin_lock+0x4c/0x60 bus_to_subsys+0x24/0xac bus_for_each_dev+0x30/0xcc soc_device_match+0x4c/0xe0 r8a7795_sysc_init+0x18/0x60 rcar_sysc_pd_init+0xb0/0x33c do_one_initcall+0x128/0x2bc Before, bus_for_each_dev() handled this gracefully by checking that the back-pointer to the private structure was valid. Fix this by adding a NULL check for bus_kset to bus_to_subsys(). Fixes: 83b9148d ("driver core: bus: bus iterator cleanups") Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Link: https://lore.kernel.org/r/0a92979f6e790737544638e8a4c19b0564e660a2.1676983596.git.geert+renesas@glider.beSigned-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
e8b812b3