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atmdev_ops::change_qos() was the hook for renegotiating the traffic parameters of an already-connected VCC, driven from SO_ATMQOS on a connected socket (and previously from the SVC as_modify path, now gone). None of the ATM drivers left in tree implement it - solos-pci only listed change_qos = NULL - so atm_change_qos() always returned -EOPNOTSUPP. Drop the operation and return -EOPNOTSUPP directly. Link: https://patch.msgid.link/20260615194416.752559-7-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>