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linux-uconsole/drivers/net/phy
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Heiner Kallweit 2dd6994329 net: phy: consider latched link-down status in polling mode 
[ Upstream commit 93c0970493 ]

The link status value latches link-down events. To get the current
status we read the register twice in genphy_update_link(). There's
a potential risk that we miss a link-down event in polling mode.
This may cause issues if the user e.g. connects his machine to a
different network.

On the other hand reading the latched value may cause issues in
interrupt mode. Following scenario:

- After boot link goes up
- phy_start() is called triggering an aneg restart, hence link goes
  down and link-down info is latched.
- After aneg has finished link goes up and triggers an interrupt.
  Interrupt handler reads link status, means it reads the latched
  "link is down" info. But there won't be another interrupt as long
  as link stays up, therefore phylib will never recognize that link
  is up.

Deal with both scenarios by reading the register twice in interrupt
mode only.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2019-04-05 22:33:10 +02:00
..
amd.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
aquantia.c net: phy: aquantia: Utilize genphy_c45_aneg_done() 2018-03-01 21:23:34 -05:00
asix.c net-next: phy: new Asix Electronics PHY driver 2018-04-19 16:11:10 -04:00
at803x.c net: phy: fix wrong masks to phy_modify() 2018-01-08 14:20:21 -05:00
bcm-cygnus.c net: phy: broadcom: Fix bcm_write_exp() 2018-05-23 15:27:01 -04:00
bcm-phy-lib.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-05-26 19:46:15 -04:00
bcm-phy-lib.h net: phy: broadcom: Fix bcm_write_exp() 2018-05-23 15:27:01 -04:00
bcm7xxx.c net: phy: Add support for Broadcom Omega internal Combo GPHY 2018-08-07 15:48:38 -07:00
bcm63xx.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
bcm87xx.c
broadcom.c net: phy: broadcom: Enable 125 MHz clock on LED4 pin for BCM54612E by default. 2018-06-05 09:43:09 -04:00
cicada.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
cortina.c net: phy: cortina: Utilize generic functions 2018-03-01 21:23:35 -05:00
davicom.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
dp83tc811.c net: phy: DP83TC811: Fix SGMII enable/disable 2018-07-03 11:38:07 +09:00
dp83640.c net: dp83640: expire old TX-skb 2019-02-12 19:47:21 +01:00
dp83640_reg.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dp83822.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
dp83848.c net: phy: dp83822: use BMCR_ANENABLE instead of BMSR_ANEGCAPABLE for DP83620 2018-06-10 12:38:03 -07:00
dp83867.c net: phy: dp83867: Add binding for the CLK_OUT pin muxing option 2018-02-14 15:33:43 -05:00
et1011c.c
fixed_phy.c net: phy: fixed-phy: Make the error path simpler 2018-06-24 16:41:58 +09:00
icplus.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
intel-xway.c net: phy: intel-xway: add VR9 v1.1 phy ids 2018-03-23 13:19:49 -04:00
Kconfig net: phy: sfp: Do not use "imply HWMON" 2018-07-21 19:26:54 -07:00
lxt.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
Makefile net: phy: mscc-miim: Add MDIO driver 2018-05-15 16:41:15 -04:00
marvell.c Revert "net: phy: marvell: avoid pause mode on SGMII-to-Copper for 88e151x" 2019-02-12 19:47:22 +01:00
marvell10g.c net: phy: marvell10g: add thermal hwmon device 2018-04-04 11:24:54 -04:00
mdio-bcm-iproc.c
mdio-bcm-unimac.c net: phy: mdio-bcm-unimac: fix potential NULL dereference in unimac_mdio_probe() 2018-01-11 13:56:24 -05:00
mdio-bitbang.c net: phy: mdio-bitbang: Remove reset support 2018-04-19 15:59:10 -04:00
mdio-boardinfo.c net: phy: mdio-boardinfo: Allow recursive mdiobus_register() 2018-04-20 10:33:26 -04:00
mdio-boardinfo.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mdio-cavium.c
mdio-cavium.h
mdio-gpio.c net: phy: mdio-gpio: Fix working over slow can_sleep GPIOs 2018-11-23 08:17:06 +01:00
mdio-hisi-femac.c
mdio-i2c.c net: phy: add I2C mdio bus 2017-08-06 20:55:28 -07:00
mdio-i2c.h net: phy: add I2C mdio bus 2017-08-06 20:55:28 -07:00
mdio-moxart.c
mdio-mscc-miim.c drivers: net: Remove device_node checks with of_mdiobus_register() 2018-05-16 14:20:36 -04:00
mdio-mux-bcm-iproc.c net: phy: Add pm support to Broadcom iProc mdio mux driver 2018-08-02 14:36:49 -07:00
mdio-mux-gpio.c mdio-mux-gpio: Remove VLA usage 2018-06-26 23:24:07 +09:00
mdio-mux-mmioreg.c net: phy: mdio-mux: slience probe defer error 2018-03-07 12:39:59 -05:00
mdio-mux.c net: mdio-mux: add mdio_mux parameter to mdio_mux_init() 2017-09-05 14:42:52 -07:00
mdio-octeon.c
mdio-sun4i.c mdio-sun4i: Fix a memory leak 2018-01-08 14:30:28 -05:00
mdio-thunder.c
mdio-xgene.c net: phy: xgene: disable clk on error paths 2017-12-18 15:09:42 -05:00
mdio-xgene.h
mdio_bus.c mdio_bus: Fix use-after-free on device_register fails 2019-03-19 13:12:40 +01:00
mdio_device.c phylib: rename reset-(post-)delay-us to reset-(de)assert-us 2017-12-27 11:06:50 -05:00
meson-gxl.c net: phy: meson-gxl: fix interrupt support 2019-04-03 06:26:17 +02:00
micrel.c net: phy: Micrel KSZ8061: link failure after cable connect 2019-03-10 07:17:18 +01:00
microchip.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-04-21 16:32:48 -04:00
microchip_t1.c microchip_t1: Add driver for Microchip LAN87XX T1 PHYs 2018-05-10 14:16:36 -04:00
mscc.c net: phy: mscc: the extended page access register is 16 bits 2018-07-30 09:42:32 -07:00
national.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
phy-c45.c net: phy: consider latched link-down status in polling mode 2019-04-05 22:33:10 +02:00
phy-core.c net: phy: Fix spelling mistake: "advertisment"-> "advertisement" 2018-03-04 18:11:54 -05:00
phy.c net: phy: add helper phy_polling_mode 2018-07-25 13:41:22 -07:00
phy_device.c net: phy: consider latched link-down status in polling mode 2019-04-05 22:33:10 +02:00
phy_led_triggers.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
phylink.c net: phy: phylink: fix uninitialized variable in phylink_get_mac_state 2019-03-10 07:17:18 +01:00
qsemi.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
realtek.c net: phy: realtek: fix RTL8201F sysfs name 2018-11-23 08:17:06 +01:00
rockchip.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
sfp-bus.c net: sfp: do not probe SFP module before we're attached 2019-02-27 10:08:58 +01:00
sfp.c net: sfp: do not probe SFP module before we're attached 2019-02-27 10:08:58 +01:00
sfp.h net: sfp: do not probe SFP module before we're attached 2019-02-27 10:08:58 +01:00
smsc.c drivers: net: replace UINT64_MAX with U64_MAX 2018-04-27 20:18:55 -04:00
spi_ks8995.c drivers/net: Use octal not symbolic permissions 2018-03-26 12:07:49 -04:00
ste10Xp.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
swphy.c
swphy.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
teranetics.c net: phy: teranetics: Utilize generic functions 2018-03-01 21:23:34 -05:00
uPD60620.c net: phy: remove generic settings for callbacks config_aneg and read_status from drivers 2017-12-01 15:42:21 -05:00
vitesse.c net: phy: vitesse: Add support for VSC73xx 2018-07-04 11:30:02 +09:00
xilinx_gmii2rgmii.c net: phy: xgmiitorgmii: Support generic PHY status read 2019-02-23 09:07:25 +01:00