net: mscc: ocelot: perform error cleanup in ocelot_hwstamp_set()

[ Upstream commit 43a41663 ]

An unsupported RX filter will leave the port with TX timestamping still
applied as per the new request, rather than the old setting. When
parsing the tx_type, don't apply it just yet, but delay that until after
we've parsed the rx_filter as well (and potentially returned -ERANGE for
that).

Similarly, copy_to_user() may fail, which is a rare occurrence, but
should still be treated by unwinding what was done.

Fixes: 96ca08c0 ("net: mscc: ocelot: set up traps for PTP packets")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://patch.msgid.link/20241205145519.1236778-6-vladimir.oltean@nxp.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>