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| author | Eric Dumazet <edumazet@google.com> | 2015-01-16 04:04:22 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-02-27 04:48:47 +0300 |
| commit | 06b5ff9f351205b2900c9629addf74a4c875b12c (patch) | |
| tree | 63703c7c2bc589e7e205b108fdd830814b6499f6 /sound/soc/soc-utils.c | |
| parent | 1d480edb0cee748ef61b4b8f7b21ab2d1c3ff0a2 (diff) | |
| download | linux-06b5ff9f351205b2900c9629addf74a4c875b12c.tar.xz | |
net: rps: fix cpu unplug
[ Upstream commit ac64da0b83d82abe62f78b3d0e21cca31aea24fa ]
softnet_data.input_pkt_queue is protected by a spinlock that
we must hold when transferring packets from victim queue to an active
one. This is because other cpus could still be trying to enqueue packets
into victim queue.
A second problem is that when we transfert the NAPI poll_list from
victim to current cpu, we absolutely need to special case the percpu
backlog, because we do not want to add complex locking to protect
process_queue : Only owner cpu is allowed to manipulate it, unless cpu
is offline.
Based on initial patch from Prasad Sodagudi & Subash Abhinov
Kasiviswanathan.
This version is better because we do not slow down packet processing,
only make migration safer.
Reported-by: Prasad Sodagudi <psodagud@codeaurora.org>
Reported-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound/soc/soc-utils.c')
0 files changed, 0 insertions, 0 deletions