DENG Qingfang 764cc5c6a6 generic: mt7530: fix null pointer dereferencing in port5 setup
The 2nd gmac of mediatek soc ethernet may not be connected to a PHY
and a phy-handle isn't always available.
Unfortunately, mt7530 dsa driver assumes that the 2nd gmac is always
connected to switch port 5 and setup mt7530 according to phy address
of 2nd gmac node, causing null pointer dereferencing when phy-handle
isn't defined in dts.
This commit fix this setup code by checking return value of
of_parse_phandle before using it.

Signed-off-by: DENG Qingfang <dengqf6@mail2.sysu.edu.cn>
2020-04-04 14:56:14 +08:00
2019-07-26 08:09:16 +02:00

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