Re: [PATCH 6.1 000/243] 6.1.91-rc2 review

[Florian Fainelli]

On 5/15/24 09:40, Florian Fainelli wrote:
> On 5/15/24 09:20, Linus Torvalds wrote:
> > On Wed, 15 May 2024 at 09:17, Mark Brown <broonie@xxxxxxxxxx> wrote:
> > >      A bisect claims that "net: bcmgenet:
> > > synchronize EXT_RGMII_OOB_CTRL access" is the first commit that breaks,
> > > I'm not seeing issues with other stables.
> >
> > That's d85cf67a3396 ("net: bcmgenet: synchronize EXT_RGMII_OOB_CTRL
> > access") upstream. Is upstream ok?
>
> Yes, upstream is OK.
>
> Exact same issue on 6.1 not just on Raspberry Pi chips but also on 
> ARCH_BRCMSTB systems as well that also make use of the GENET driver.
>
> Doug and I will take a look and provide an updated set of fixes, 
> meanwhile, I would recommend dropping all of Doug's patches for now 
> until we can post a revised series and/or missing dependencies.

OK, I think I see the problem. The upstream patch was applied to the 
wrong context. In upstream, the critical section is added to 
bcmgenet_mii_config() which did not run with the phy_device::mutex_lock 
held before, and that was the race that we are trying to close. In 
linux-stable-rc/linux-6.1.y however the context somehow resolved to 
applying the critical section to the bcmgenet_mac_config() section where 
we are already running with phy_device::lock being held by virtue of the 
PHY library running our bcmgenet_mac_config() callback.

The corrected incremental diff would look like this:

diff --git a/drivers/net/ethernet/broadcom/genet/bcmmii.c 
b/drivers/net/ethernet/broadcom/genet/bcmmii.c
index 94e0e858266e..46252d96b90e 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmmii.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmmii.c
@@ -71,12 +71,10 @@ static void bcmgenet_mac_config(struct net_device *dev)
         * transmit -- 25MHz(100Mbps) or 125MHz(1Gbps).
         * Receive clock is provided by the PHY.
         */
-       mutex_lock(&phydev->lock);
        reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
        reg &= ~OOB_DISABLE;
        reg |= RGMII_LINK;
        bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
-       mutex_unlock(&phydev->lock);

        spin_lock_bh(&priv->reg_lock);
        reg = bcmgenet_umac_readl(priv, UMAC_CMD);
@@ -271,6 +269,7 @@ int bcmgenet_mii_config(struct net_device *dev, bool 
init)
         * block for the interface to work
         */
        if (priv->ext_phy) {
+               mutex_lock(&phydev->lock);
                reg = bcmgenet_ext_readl(priv, EXT_RGMII_OOB_CTRL);
                reg &= ~ID_MODE_DIS;
                reg |= id_mode_dis;
@@ -279,6 +278,7 @@ int bcmgenet_mii_config(struct net_device *dev, bool 
init)
                else
                        reg |= RGMII_MODE_EN;
                bcmgenet_ext_writel(priv, reg, EXT_RGMII_OOB_CTRL);
+               mutex_unlock(&phydev->lock);
        }

        if (init)

We could, and should consider taking 
696450c05181559a35d4d5bee55c465b1ac6fe2e ("net: bcmgenet: Clear 
RGMII_LINK upon link down") as a prerequisite as well to provide the 
right context while applying  d85cf67a339685beae1d0aee27b7f61da95455be 
("net: bcmgenet: synchronize EXT_RGMII_OOB_CTRL access")

Mark, can you try that, too?
--
Florian

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