netdev - [PATCH RFC 1/7] net: phy: unconditionally resume and re-enable interrupts, in phy

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: <9799af8c-4328-958d-70ec-e3f22a995273@gmail.com>
Date:   Wed, 14 Mar 2018 21:16:16 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH RFC 1/7] net: phy: unconditionally resume and re-enable
 interrupts, in phy_start

In subsequent patches of this series interrupts will be disabled during
system suspend, also we will have to resume the PHY in states other than
PHY_HALTED. To prepare for this unconditionally resume and re-enable
interrupts in phy_start().

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/net/phy/phy.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 05c1e8ef1..0aef35efd 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -791,10 +791,16 @@ EXPORT_SYMBOL(phy_stop);
  */
 void phy_start(struct phy_device *phydev)
 {
-	int err = 0;
+	/* if phy was suspended, bring the physical link up again */
+	phy_resume(phydev);
 
-	mutex_lock(&phydev->lock);
+	/* make sure interrupts are re-enabled for the PHY */
+	if (phy_interrupt_is_valid(phydev) && phy_enable_interrupts(phydev)) {
+		phy_error(phydev);
+		return;
+	}
 
+	mutex_lock(&phydev->lock);
 	switch (phydev->state) {
 	case PHY_STARTING:
 		phydev->state = PHY_PENDING;
@@ -803,16 +809,6 @@ void phy_start(struct phy_device *phydev)
 		phydev->state = PHY_UP;
 		break;
 	case PHY_HALTED:
-		/* if phy was suspended, bring the physical link up again */
-		__phy_resume(phydev);
-
-		/* make sure interrupts are re-enabled for the PHY */
-		if (phy_interrupt_is_valid(phydev)) {
-			err = phy_enable_interrupts(phydev);
-			if (err < 0)
-				break;
-		}
-
 		phydev->state = PHY_RESUMING;
 		break;
 	default:
-- 
2.16.2