diff options
Diffstat (limited to 'debian/patches-rt/0331-net-phy-fixed_phy-Remove-unused-seqcount.patch')
| -rw-r--r-- | debian/patches-rt/0331-net-phy-fixed_phy-Remove-unused-seqcount.patch | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/debian/patches-rt/0331-net-phy-fixed_phy-Remove-unused-seqcount.patch b/debian/patches-rt/0331-net-phy-fixed_phy-Remove-unused-seqcount.patch new file mode 100644 index 000000000..ceacf6b1e --- /dev/null +++ b/debian/patches-rt/0331-net-phy-fixed_phy-Remove-unused-seqcount.patch @@ -0,0 +1,89 @@ +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 + |