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From:   Andreas Schwab <schwab@suse.de>
To:     Andrew Lunn <andrew@lunn.ch>
Cc:     Alexandre Belloni <alexandre.belloni@bootlin.com>,
        Quentin Schulz <quentin.schulz@bootlin.com>,
        davem@davemloft.net, f.fainelli@gmail.com,
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        linux-riscv@lists.infradead.org
Subject: Re: [PATCH net-next v3 1/6] net: phy: mscc: migrate to phy_select/restore_page functions
References: <20181008100728.24959-1-quentin.schulz@bootlin.com>
        <20181008100728.24959-2-quentin.schulz@bootlin.com>
        <mvm8t1pazea.fsf@suse.de> <20181119151057.GC26852@lunn.ch>
        <mvm4lcdaynt.fsf@suse.de> <20181119152830.GE26852@lunn.ch>
        <20181119154005.GA8367@piout.net> <mvmzhu59idl.fsf@suse.de>
        <20181119161204.GC2393@lunn.ch>
X-Yow:  Jesus is my POSTMASTER GENERAL..
Date:   Tue, 20 Nov 2018 12:39:51 +0100
In-Reply-To: <20181119161204.GC2393@lunn.ch> (Andrew Lunn's message of "Mon,
        19 Nov 2018 17:12:04 +0100")
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On Nov 19 2018, Andrew Lunn <andrew@lunn.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@suse.de
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"And now for something completely different."