netdev - Re: [PATCH net-next v8 6/9] net: phy: c22: migrate to genphy_c45_write_eee

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Date:   Thu, 23 Feb 2023 19:55:53 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Woojung Huh <woojung.huh@...rochip.com>,
        UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, Wei Fang <wei.fang@....com>,
        Heiner Kallweit <hkallweit1@...il.com>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Arun.Ramadoss@...rochip.com, intel-wired-lan@...ts.osuosl.org
Subject: Re: [PATCH net-next v8 6/9] net: phy: c22: migrate to
 genphy_c45_write_eee_adv()

On Sat, Feb 11, 2023 at 08:41:10AM +0100, Oleksij Rempel wrote:
> Migrate from genphy_config_eee_advert() to genphy_c45_write_eee_adv().
> 
> It should work as before except write operation to the EEE adv registers
> will be done only if some EEE abilities was detected.
> 
> If some driver will have a regression, related driver should provide own
> .get_features callback. See micrel.c:ksz9477_get_features() as example.
> 
> Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>

This patch causes network interface failures with all my xtensa qemu
emulations. Reverting it fixes the problem. Bisect log is attached
for reference.

Guenter

---
# bad: [e4bc15889506723d7b93c053ad4a75cd58248d74] Merge tag 'leds-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/leds
# good: [c9c3395d5e3dcc6daee66c6908354d47bf98cb0c] Linux 6.2
git bisect start 'HEAD' 'c9c3395d5e3d'
# bad: [5b7c4cabbb65f5c469464da6c5f614cbd7f730f2] Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next
git bisect bad 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2
# good: [877934769e5b91798d304d4641647900ee614ce8] Merge tag 'x86_cpu_for_v6.3_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 877934769e5b91798d304d4641647900ee614ce8
# good: [c5ebba75c7625e5cb62cb5423883cc3764779420] net: ipa: use bitmasks for GSI IRQ values
git bisect good c5ebba75c7625e5cb62cb5423883cc3764779420
# bad: [871489dd01b67483248edc8873c389a66e469f30] Merge tag 'ieee802154-for-net-next-2023-02-20' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan-next
git bisect bad 871489dd01b67483248edc8873c389a66e469f30
# good: [986e43b19ae9176093da35e0a844e65c8bf9ede7] wifi: mac80211: fix receiving A-MSDU frames on mesh interfaces
git bisect good 986e43b19ae9176093da35e0a844e65c8bf9ede7
# bad: [ca0df43d211039dded5a8f8553356414c9a74731] Merge tag 'wireless-next-2023-03-16' of git://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next
git bisect bad ca0df43d211039dded5a8f8553356414c9a74731
# bad: [388a9c907a51489bf566165c72e4e8aa4d62ab49] Merge branch 'devlink-cleanups-and-move-devlink-health-functionality-to-separate-file'
git bisect bad 388a9c907a51489bf566165c72e4e8aa4d62ab49
# bad: [1a940b00013a468c0c9dd79dbb485c3ad273939e] net: stmmac: dwc-qos: Make struct dwc_eth_dwmac_data::remove return void
git bisect bad 1a940b00013a468c0c9dd79dbb485c3ad273939e
# good: [8024edf3590c83f467374857d7c3082d4b3bf079] Merge branch 'net-ipa-GSI-regs'
git bisect good 8024edf3590c83f467374857d7c3082d4b3bf079
# bad: [9b01c885be364526d8c05794f8358b3e563b7ff8] net: phy: c22: migrate to genphy_c45_write_eee_adv()
git bisect bad 9b01c885be364526d8c05794f8358b3e563b7ff8
# good: [79cdf17e5131ccdee0792f6f25d3db0e34861998] Merge branch 'ionic-on-chip-desc'
git bisect good 79cdf17e5131ccdee0792f6f25d3db0e34861998
# good: [48fb19940f2ba6b50dfea70f671be9340fb63d60] net: phy: micrel: add ksz9477_get_features()
git bisect good 48fb19940f2ba6b50dfea70f671be9340fb63d60
# good: [022c3f87f88e2d68e90be7687d981c9cb893a3b1] net: phy: add genphy_c45_ethtool_get/set_eee() support
git bisect good 022c3f87f88e2d68e90be7687d981c9cb893a3b1
# first bad commit: [9b01c885be364526d8c05794f8358b3e563b7ff8] net: phy: c22: migrate to genphy_c45_write_eee_adv()