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dsa: qca8k: Use nested lock to avoid splat
authorAndrew Lunn <andrew@lunn.ch>
Sun, 10 Nov 2024 17:59:55 +0000 (18:59 +0100)
committerJakub Kicinski <kuba@kernel.org>
Wed, 13 Nov 2024 02:25:30 +0000 (18:25 -0800)
commit078e0d596f7b5952dad8662ace8f20ed2165e2ce
tree0b23f324d42e6d25b04d79164d98e6a6d618819ftree
parentb169e76ebad22cbd055101ee5aa1a7bed0e66606commit | diff
dsa: qca8k: Use nested lock to avoid splat

qca8k_phy_eth_command() is used to probe the child MDIO bus while the
parent MDIO is locked. This causes lockdep splat, reporting a possible
deadlock. It is not an actually deadlock, because different locks are
used. By making use of mutex_lock_nested() we can avoid this false
positive.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20241110175955.3053664-1-andrew@lunn.ch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
drivers/net/dsa/qca/qca8k-8xxx.c diff | blob | blame | history
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