On Friday 2012-10-19 18:38, Iain Fraser wrote: >After reading [A Map of the Networking Code in Linux Kernel 2.4.20] >and thinking about it. It seems to me that packets coming from the >host will often be in process context e.g. UDP packets will be >generated for each sendto syscall. So packets in the localout and >postrouing could potentially be in run in process context. Indeed. >Therefore spin locks in those hooks should disable bottom halves to be >safe from deadlock. Can anyone confirm or invalidate this please? According to Rusty's Unrealiable Guide To Locking, spin_lock_bh type locking is appropriate in your case. http://www.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/c214.html#AEN235 [note this is old, and for example does not contain the "mutex" type lock] -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
