linux-kernel - [PATCH 3.16 044/305] net: phy: Stop with excessive soft reset

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <lsq.1549201508.750825954@decadent.org.uk>
Date:   Sun, 03 Feb 2019 14:45:08 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Florian Fainelli" <f.fainelli@...il.com>,
        "Andrew Lunn" <andrew@...n.ch>,
        "David S. Miller" <davem@...emloft.net>,
        "Clemens Gruber" <clemens.gruber@...ruber.com>,
        "Chris Healy" <cphealy@...il.com>,
        "Wang, Dongsheng" <dongsheng.wang@...-semitech.com>
Subject: [PATCH 3.16 044/305] net: phy: Stop with excessive soft reset

3.16.63-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Florian Fainelli <f.fainelli@...il.com>

commit 6e2d85ec05591b739059f65fe8438c9c5999f7d8 upstream.

While consolidating the PHY reset in phy_init_hw() an unconditionaly
BMCR soft-reset I became quite trigger happy with those. This was later
on deactivated for the Generic PHY driver on the premise that a prior
software entity (e.g: bootloader) might have applied workarounds in
commit 0878fff1f42c ("net: phy: Do not perform software reset for
Generic PHY").

Since we have a hook to wire-up a soft_reset callback, just use that and
get rid of the call to genphy_soft_reset() entirely. This speeds up
initialization and link establishment for most PHYs out there that do
not require a reset.

Fixes: 87aa9f9c61ad ("net: phy: consolidate PHY reset in phy_init_hw()")
Tested-by: Wang, Dongsheng <dongsheng.wang@...-semitech.com>
Tested-by: Chris Healy <cphealy@...il.com>
Tested-by: Andrew Lunn <andrew@...n.ch>
Tested-by: Clemens Gruber <clemens.gruber@...ruber.com>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/phy/phy_device.c | 2 --
 1 file changed, 2 deletions(-)

--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -543,8 +543,6 @@ int phy_init_hw(struct phy_device *phyde
 
 	if (phydev->drv->soft_reset)
 		ret = phydev->drv->soft_reset(phydev);
-	else
-		ret = genphy_soft_reset(phydev);
 
 	if (ret < 0)
 		return ret;