mvebu: remove linux 4.4 support

[openwrt/staging/lynxis/omap.git] / target / linux / mvebu / patches-4.4 / 124-phy-improve-safety-of-fixed-phy-MII-register-reading.patch

diff --git a/target/linux/mvebu/patches-4.4/124-phy-improve-safety-of-fixed-phy-MII-register-reading.patch b/target/linux/mvebu/patches-4.4/124-phy-improve-safety-of-fixed-phy-MII-register-reading.patch
deleted file mode 100644 (file)
index 5167b07..0000000
--- a/target/linux/mvebu/patches-4.4/124-phy-improve-safety-of-fixed-phy-MII-register-reading.patch
+++ /dev/null
@@ -1,92 +0,0 @@
-From c36739c3cfd277a4cc9820a29dd0f4b7fbac795b Mon Sep 17 00:00:00 2001
-From: Russell King <rmk+kernel@arm.linux.org.uk>
-Date: Sun, 20 Sep 2015 18:31:36 +0100
-Subject: [PATCH 713/744] phy: improve safety of fixed-phy MII register reading
-
-There is no prevention of a concurrent call to both fixed_mdio_read()
-and fixed_phy_update_state(), which can result in the state being
-modified while it's being inspected.  Fix this by using a seqcount
-to detect modifications, and memcpy()ing the state.
-
-We remain slightly naughty here, calling link_update() and updating
-the link status within the read-side loop - which would need rework
-of the design to change.
-
-Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
----
- drivers/net/phy/fixed_phy.c | 28 +++++++++++++++++++++-------
- 1 file changed, 21 insertions(+), 7 deletions(-)
-
---- a/drivers/net/phy/fixed_phy.c
-+++ b/drivers/net/phy/fixed_phy.c
-@@ -23,6 +23,7 @@
- #include <linux/slab.h>
- #include <linux/of.h>
- #include <linux/gpio.h>
-+#include <linux/seqlock.h>
- 
- #include "swphy.h"
- 
-@@ -35,6 +36,7 @@ struct fixed_mdio_bus {
- struct fixed_phy {
-       int addr;
-       struct phy_device *phydev;
-+      seqcount_t seqcount;
-       struct fixed_phy_status status;
-       int (*link_update)(struct net_device *, struct fixed_phy_status *);
-       struct list_head node;
-@@ -59,13 +61,21 @@ static int fixed_mdio_read(struct mii_bu
- 
-       list_for_each_entry(fp, &fmb->phys, node) {
-               if (fp->addr == phy_addr) {
--                      /* Issue callback if user registered it. */
--                      if (fp->link_update) {
--                              fp->link_update(fp->phydev->attached_dev,
--                                              &fp->status);
--                              fixed_phy_update(fp);
--                      }
--                      return swphy_read_reg(reg_num, &fp->status);
-+                      struct fixed_phy_status state;
-+                      int s;
-+
-+                      do {
-+                              s = read_seqcount_begin(&fp->seqcount);
-+                              /* Issue callback if user registered it. */
-+                              if (fp->link_update) {
-+                                      fp->link_update(fp->phydev->attached_dev,
-+                                                      &fp->status);
-+                                      fixed_phy_update(fp);
-+                              }
-+                              state = fp->status;
-+                      } while (read_seqcount_retry(&fp->seqcount, s));
-+
-+                      return swphy_read_reg(reg_num, &state);
-               }
-       }
- 
-@@ -117,6 +127,7 @@ int fixed_phy_update_state(struct phy_de
- 
-       list_for_each_entry(fp, &fmb->phys, node) {
-               if (fp->addr == phydev->addr) {
-+                      write_seqcount_begin(&fp->seqcount);
- #define _UPD(x) if (changed->x) \
-       fp->status.x = status->x
-                       _UPD(link);
-@@ -126,6 +137,7 @@ int fixed_phy_update_state(struct phy_de
-                       _UPD(asym_pause);
- #undef _UPD
-                       fixed_phy_update(fp);
-+                      write_seqcount_end(&fp->seqcount);
-                       return 0;
-               }
-       }
-@@ -150,6 +162,8 @@ int fixed_phy_add(unsigned int irq, int
-       if (!fp)
-               return -ENOMEM;
- 
-+      seqcount_init(&fp->seqcount);
-+
-       fmb->irqs[phy_addr] = irq;
- 
-       fp->addr = phy_addr;