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net: ethernet: ti: cpsw: fix NULL pointer dereference in switch mode

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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: 03fd01ad0e ("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>
This commit is contained in:
Grygorii Strashko 2017-01-31 14:04:04 -06:00 committed by David S. Miller
parent b2504a5dbe
commit f696186203
1 changed files with 1 additions and 1 deletions
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2
drivers/net/ethernet/ti/cpsw.c
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@ -677,7 +677,7 @@ static int cpsw_get_usage_count(struct cpsw_common *cpsw)
u32 usage_count = 0;
for (i = 0; i < cpsw->data.slaves; i++)
if (netif_running(cpsw->slaves[i].ndev))
if (cpsw->slaves[i].ndev && netif_running(cpsw->slaves[i].ndev))
usage_count++;
return usage_count;