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| /freebsd-11-stable/sys/net/ | ||
| H A D | if_tap.c | diff 127165 Thu Mar 18 07:55:11 MST 2004 rwatson sAdd a comment indicating why there continues to be a race condition in the tap driver, even with Giant over the cdev operation vector, due to a non-atomic test-and-set of the si_drv1 field in the dev_t. This bug exists with Giant under high memory pressure, as malloc() may sleep in tapcreate(), but is less likely to occur. The resolution will probably be to cover si_drv1 using the global tapmtx since no softc is available, but I need to think about this problem more generally across a range of drivers using si_drv1 in combination with SI_CHEAPCLONE to defer expensive allocation to open(). Correct what appears to be a bug in the original if_tap implementation, in which tapopen() will panic if a tap device instance is opened more than once due to an incorrect assertion -- only triggered if INVARIANTS is compiled in (i.e., when built into a kernel). Return EBUSY instead. Expand mtx_lock() coverage using tp->tap_mtx to include tp->ether_addr. |
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