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From 1d956b22e273e7a1ce90b54cd84598e1a427f3f2 Mon Sep 17 00:00:00 2001
From: "Ahmed S. Darwish" <a.darwish@linutronix.de>
Date: Wed, 10 Jun 2020 12:53:00 +0200
Subject: [PATCH 331/347] net: phy: fixed_phy: Remove unused seqcount
Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz
[ Upstream commit 6554eac9ef2bd1c968886b31cc7266b49258a463 ]
Commit bf7afb29d545 ("phy: improve safety of fixed-phy MII register
reading") protected the fixed PHY status with a sequence counter.
Two years later, commit d2b977939b18 ("net: phy: fixed-phy: remove
fixed_phy_update_state()") removed the sequence counter's write side
critical section -- neutralizing its read side retry loop.
Remove the unused seqcount.
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from v5.8-rc1 commit 79cbb6bc3332da7162c2581e151659ab8ebaa528)
Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
---
drivers/net/phy/fixed_phy.c | 25 +++++++++----------------
1 file changed, 9 insertions(+), 16 deletions(-)
diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c
index 59820164502e..953ff54dd5df 100644
--- a/drivers/net/phy/fixed_phy.c
+++ b/drivers/net/phy/fixed_phy.c
@@ -23,7 +23,6 @@
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/gpio.h>
-#include <linux/seqlock.h>
#include <linux/idr.h>
#include "swphy.h"
@@ -36,7 +35,6 @@ 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;
@@ -62,18 +60,15 @@ static int fixed_mdio_read(struct mii_bus *bus, int phy_addr, int reg_num)
list_for_each_entry(fp, &fmb->phys, node) {
if (fp->addr == phy_addr) {
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);
- /* Check the GPIO for change in status */
- fixed_phy_update(fp);
- state = fp->status;
- } while (read_seqcount_retry(&fp->seqcount, s));
+
+ /* Issue callback if user registered it. */
+ if (fp->link_update)
+ fp->link_update(fp->phydev->attached_dev,
+ &fp->status);
+
+ /* Check the GPIO for change in status */
+ fixed_phy_update(fp);
+ state = fp->status;
return swphy_read_reg(reg_num, &state);
}
@@ -131,8 +126,6 @@ int fixed_phy_add(unsigned int irq, int phy_addr,
if (!fp)
return -ENOMEM;
- seqcount_init(&fp->seqcount);
-
if (irq != PHY_POLL)
fmb->mii_bus->irq[phy_addr] = irq;
--
2.36.1
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