net: ethernet: ti: cpsw: fix NULL pointer dereference in switch mode
In switch mode on struct cpsw_slave->ndev field will be initialized with proper value only for the one cpsw slave port, as result cpsw_get_usage_count() will generate "Unable to handle kernel NULL pointer dereference" exception when first ethernet interface is opening cpsw_ndo_open(). This issue causes boot regression on AM335x EVM and reproducible on am57xx-evm (switch mode). Fix it by adding additional check for !cpsw->slaves[i].ndev in cpsw_get_usage_count(). Cc: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> Fixes: 03fd01ad ("net: ethernet: ti: cpsw: don't duplicate ndev_running") Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com> Reviewed-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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