[Bug 256334] [genet] Race condition in Pi4's gen_attach() can cause SIGSEGV.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256334

            Bug ID: 256334
           Summary: [genet] Race condition in Pi4's gen_attach() can cause
                    SIGSEGV.
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: [email protected]
          Reporter: [email protected]

'genet' driver starts interrupt handlers before ifp is allocated.

Version: git main @ d3f7975fcb346ea28dde079a9c04cff5ef20a8d7

gen_intr() uses sc->ifp here:
https://cgit.freebsd.org/src/blame/sys/arm64/broadcom/genet/if_genet.c#n1260

gen_attach() calls bus_setup_intr() here:
https://cgit.freebsd.org/src/blame/sys/arm64/broadcom/genet/if_genet.c#n283
https://cgit.freebsd.org/src/blame/sys/arm64/broadcom/genet/if_genet.c#n290

gen_attach() calls if_alloc() here:
https://cgit.freebsd.org/src/blame/sys/arm64/broadcom/genet/if_genet.c#n298

Possible fixes:
gen_attach() could either hold GEN_LOCK() or complete the init before the
bus_setup_intr() calls.

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