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commita4fc088ad4upstream. The command "ethtool -L <intf> combined 0" may clean the RX/TX channel count and skip the error path, since the attrs tb[ETHTOOL_A_CHANNELS_RX_COUNT] and tb[ETHTOOL_A_CHANNELS_TX_COUNT] are NULL in this case when recent ethtool is used. Tested using ethtool v5.10. Fixes:7be92514b9("ethtool: check if there is at least one channel for TX/RX in the core") Signed-off-by: Yinjun Zhang <yinjun.zhang@corigine.com> Signed-off-by: Simon Horman <simon.horman@netronome.com> Signed-off-by: Louis Peens <louis.peens@netronome.com> Link: https://lore.kernel.org/r/20210225125102.23989-1-simon.horman@netronome.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>