Daniel Borkmann a66e36568e netlink, mmap: don't walk rx ring on poll if receive queue non-empty ... In case of netlink mmap, there can be situations where received frames have to be placed into the normal receive queue. The ring buffer indicates this through NL_MMAP_STATUS_COPY, so the user is asked to pick them up via recvmsg(2) syscall, and to put the slot back to NL_MMAP_STATUS_UNUSED. Commit 0ef707700f ("netlink: rx mmap: fix POLLIN condition") changed polling, so that we walk in the worst case the whole ring through the new netlink_has_valid_frame(), for example, when the ring would have no NL_MMAP_STATUS_VALID, but at least one NL_MMAP_STATUS_COPY frame. Since we do a datagram_poll() already earlier to pick up a mask that could possibly contain POLLIN | POLLRDNORM already (due to NL_MMAP_STATUS_COPY), we can skip checking the rx ring entirely. In case the kernel is compiled with !CONFIG_NETLINK_MMAP, then all this is irrelevant anyway as netlink_poll() is just defined as datagram_poll(). Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>		2015-09-09 21:42:51 -07:00
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af_netlink.c	netlink, mmap: don't walk rx ring on poll if receive queue non-empty	2015-09-09 21:42:51 -07:00
af_netlink.h	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-01-27 16:59:56 -08:00
diag.c	netlink: make nlmsg_end() and genlmsg_end() void	2015-01-18 01:03:45 -05:00
genetlink.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-01-27 16:59:56 -08:00
Kconfig	netlink: kconfig: move mmap i/o into netlink kconfig	2013-05-01 15:02:42 -04:00
Makefile	netlink: Diag core and basic socket info dumping (v2)	2013-03-21 12:38:03 -04:00