kernel: remove support for kernel 4.9

[openwrt/staging/dedeckeh.git] / target / linux / generic / backport-4.9 / 024-9-tcp-add-a-missing-barrier-in-tcp_tasklet_func.patch

diff --git a/target/linux/generic/backport-4.9/024-9-tcp-add-a-missing-barrier-in-tcp_tasklet_func.patch b/target/linux/generic/backport-4.9/024-9-tcp-add-a-missing-barrier-in-tcp_tasklet_func.patch
deleted file mode 100644 (file)
index bcdbe8c..0000000
--- a/target/linux/generic/backport-4.9/024-9-tcp-add-a-missing-barrier-in-tcp_tasklet_func.patch
+++ /dev/null
@@ -1,40 +0,0 @@
-From 0a9648f1293966c838dc570da73c15a76f4c89d6 Mon Sep 17 00:00:00 2001
-From: Eric Dumazet <edumazet@google.com>
-Date: Wed, 21 Dec 2016 05:42:43 -0800
-Subject: [PATCH 09/10] tcp: add a missing barrier in tcp_tasklet_func()
-
-Madalin reported crashes happening in tcp_tasklet_func() on powerpc64
-
-Before TSQ_QUEUED bit is cleared, we must ensure the changes done
-by list_del(&tp->tsq_node); are committed to memory, otherwise
-corruption might happen, as an other cpu could catch TSQ_QUEUED
-clearance too soon.
-
-We can notice that old kernels were immune to this bug, because
-TSQ_QUEUED was cleared after a bh_lock_sock(sk)/bh_unlock_sock(sk)
-section, but they could have missed a kick to write additional bytes,
-when NIC interrupts for a given flow are spread to multiple cpus.
-
-Affected TCP flows would need an incoming ACK or RTO timer to add more
-packets to the pipe. So overall situation should be better now.
-
-Fixes: b223feb9de2a ("tcp: tsq: add shortcut in tcp_tasklet_func()")
-Signed-off-by: Eric Dumazet <edumazet@google.com>
-Reported-by: Madalin Bucur <madalin.bucur@nxp.com>
-Tested-by: Madalin Bucur <madalin.bucur@nxp.com>
-Tested-by: Xing Lei <xing.lei@nxp.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
----
- net/ipv4/tcp_output.c | 1 +
- 1 file changed, 1 insertion(+)
-
---- a/net/ipv4/tcp_output.c
-+++ b/net/ipv4/tcp_output.c
-@@ -775,6 +775,7 @@ static void tcp_tasklet_func(unsigned lo
-               list_del(&tp->tsq_node);
- 
-               sk = (struct sock *)tp;
-+              smp_mb__before_atomic();
-               clear_bit(TSQ_QUEUED, &sk->sk_tsq_flags);
- 
-               if (!sk->sk_lock.owned &&