net: dsa: felix: access QSYS_TAG_CONFIG under tas_lock in vsc9959_sched_speed_set

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[ Upstream commit a4bb481aeb ]

The read-modify-write of QSYS_TAG_CONFIG from vsc9959_sched_speed_set()
runs unlocked with respect to the other functions that access it, which
are vsc9959_tas_guard_bands_update(), vsc9959_qos_port_tas_set() and
vsc9959_tas_clock_adjust(). All the others are under ocelot->tas_lock,
so move the vsc9959_sched_speed_set() access under that lock as well, to
resolve the concurrency.

Fixes: 55a515b1f5 ("net: dsa: felix: drop oversized frames with tc-taprio instead of hanging the port")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Vladimir Oltean 2022-09-05 20:01:25 +03:00 • committed by Greg Kroah-Hartman

parent 27474e8bfc

commit e502794fb8

1 changed files with 2 additions and 2 deletions

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drivers/net/dsa/ocelot/felix_vsc9959.c

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