mvebu: remove linux 4.4 support

[openwrt/staging/lynxis/omap.git] / target / linux / mvebu / patches-4.4 / 041-net-mvneta-The-mvneta_percpu_elect-function-should-b.patch

diff --git a/target/linux/mvebu/patches-4.4/041-net-mvneta-The-mvneta_percpu_elect-function-should-b.patch b/target/linux/mvebu/patches-4.4/041-net-mvneta-The-mvneta_percpu_elect-function-should-b.patch
deleted file mode 100644 (file)
index a77bef4..0000000
--- a/target/linux/mvebu/patches-4.4/041-net-mvneta-The-mvneta_percpu_elect-function-should-b.patch
+++ /dev/null
@@ -1,68 +0,0 @@
-From: Gregory CLEMENT <gregory.clement@free-electrons.com>
-Date: Thu, 4 Feb 2016 22:09:28 +0100
-Subject: [PATCH] net: mvneta: The mvneta_percpu_elect function should be
- atomic
-
-Electing a CPU must be done in an atomic way: it should be done after or
-before the removal/insertion of a CPU and this function is not reentrant.
-
-During the loop of mvneta_percpu_elect we associates the queues to the
-CPUs, if there is a topology change during this loop, then the mapping
-between the CPUs and the queues could be wrong. During this loop the
-interrupt mask is also updating for each CPUs, It should not be changed
-in the same time by other part of the driver.
-
-This patch adds spinlock to create the needed critical sections.
-
-Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
-Signed-off-by: David S. Miller <davem@davemloft.net>
----
-
---- a/drivers/net/ethernet/marvell/mvneta.c
-+++ b/drivers/net/ethernet/marvell/mvneta.c
-@@ -370,6 +370,10 @@ struct mvneta_port {
-       struct net_device *dev;
-       struct notifier_block cpu_notifier;
-       int rxq_def;
-+      /* Protect the access to the percpu interrupt registers,
-+       * ensuring that the configuration remains coherent.
-+       */
-+      spinlock_t lock;
- 
-       /* Core clock */
-       struct clk *clk;
-@@ -2853,6 +2857,12 @@ static void mvneta_percpu_elect(struct m
- {
-       int elected_cpu = 0, max_cpu, cpu, i = 0;
- 
-+      /* Electing a CPU must be done in an atomic way: it should be
-+       * done after or before the removal/insertion of a CPU and
-+       * this function is not reentrant.
-+       */
-+      spin_lock(&pp->lock);
-+
-       /* Use the cpu associated to the rxq when it is online, in all
-        * the other cases, use the cpu 0 which can't be offline.
-        */
-@@ -2896,6 +2906,7 @@ static void mvneta_percpu_elect(struct m
-               i++;
- 
-       }
-+      spin_unlock(&pp->lock);
- };
- 
- static int mvneta_percpu_notifier(struct notifier_block *nfb,
-@@ -2950,8 +2961,13 @@ static int mvneta_percpu_notifier(struct
-       case CPU_DOWN_PREPARE:
-       case CPU_DOWN_PREPARE_FROZEN:
-               netif_tx_stop_all_queues(pp->dev);
-+              /* Thanks to this lock we are sure that any pending
-+               * cpu election is done
-+               */
-+              spin_lock(&pp->lock);
-               /* Mask all ethernet port interrupts */
-               on_each_cpu(mvneta_percpu_mask_interrupt, pp, true);
-+              spin_unlock(&pp->lock);
- 
-               napi_synchronize(&port->napi);
-               napi_disable(&port->napi);