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drivers: net: cpsw: fix wrong regs access in cpsw_ndo_open

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The cpsw_ndo_open() could try to access CPSW registers before
calling pm_runtime_get_sync(). This will trigger L3 error:

 WARNING: CPU: 0 PID: 21 at drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x220/0x34c()
 44000000.ocp:L3 Custom Error: MASTER M2 (64-bit) TARGET L4_FAST (Idle): Data Access in Supervisor mode during Functional access

and CPSW will stop functioning.

Hence, fix it by moving pm_runtime_get_sync() before the first access
to CPSW registers in cpsw_ndo_open().

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Grygorii Strashko 2016-04-19 21:09:49 +03:00 committed by David S. Miller
parent 479f85c366
commit 3fa88c51c7
1 changed files with 2 additions and 2 deletions
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4
drivers/net/ethernet/ti/cpsw.c
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@ -1251,12 +1251,12 @@ static int cpsw_ndo_open(struct net_device *ndev)
int i, ret;
u32 reg;
pm_runtime_get_sync(&priv->pdev->dev);
if (!cpsw_common_res_usage_state(priv))
cpsw_intr_disable(priv);
netif_carrier_off(ndev);
pm_runtime_get_sync(&priv->pdev->dev);
reg = priv->version;
dev_info(priv->dev, "initializing cpsw version %d.%d (%d)\n",