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faf3a932fb
It is perfectly possible to have non zero indexed switches being present
in a DSA switch tree, in such a case, we will be deferencing a NULL
pointer while dsa_cpu_port_ethtool_{setup,restore}. Be more defensive
and ensure that dst->ds[0] is valid before doing anything with it.
Fixes:
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.. | ||
dsa.c | ||
dsa2.c | ||
dsa_priv.h | ||
Kconfig | ||
Makefile | ||
slave.c | ||
tag_brcm.c | ||
tag_dsa.c | ||
tag_edsa.c | ||
tag_qca.c | ||
tag_trailer.c |