linux-kernel - Re: [PATCH net-next v3 1/6] net: phy: mscc: migrate to phy_select/restore

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Date:   Tue, 20 Nov 2018 12:39:51 +0100
From:   Andreas Schwab <schwab@...e.de>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Quentin Schulz <quentin.schulz@...tlin.com>,
        davem@...emloft.net, f.fainelli@...il.com,
        allan.nielsen@...rochip.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, thomas.petazzoni@...tlin.com,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH net-next v3 1/6] net: phy: mscc: migrate to phy_select/restore_page functions

On Nov 19 2018, Andrew Lunn <andrew@...n.ch> wrote:

> I still don't see why that would cause a hang.

[  996.370000] [<ffffffe0011d7324>] mutex_lock+0x22/0x2a
[  996.380000] [<ffffffe001039ba0>] mdiobus_read+0x36/0x60
[  996.380000] [<ffffffe00103b82c>] vsc85xx_config_init+0x4c/0x1e2

vsc85xx_config_init is calling mdiobus_read while holding the mdio_lock.

Andreas.

-- 
Andreas Schwab, SUSE Labs, schwab@...e.de
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