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Date: Thu, 16 Jun 2022 15:34:18 +0200 From: Andrew Lunn <andrew@...n.ch> To: Oleksij Rempel <o.rempel@...gutronix.de> Cc: Vivien Didelot <vivien.didelot@...il.com>, Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, kernel@...gutronix.de, linux-kernel@...r.kernel.org, netdev@...r.kernel.org Subject: Re: [PATCH net-next v1 1/1] net: dsa: ar9331: fix potential dead lock on mdio access > static int ar9331_mdio_read(void *ctx, const void *reg_buf, size_t reg_len, > @@ -849,6 +849,8 @@ static int ar9331_mdio_read(void *ctx, const void *reg_buf, size_t reg_len, > return 0; > } > > + mutex_lock_nested(&sbus->mdio_lock, MDIO_MUTEX_NESTED); > + Do you know about mdiobus_read_nested() and mdiobus_write_nested(). The mv88e6xxx driver uses these. Andrew
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