i40evf_add_vlan() is never called in atomic context.

i40evf_add_vlan() is only called by i40evf_vlan_rx_add_vid(), 
which is only set as ".ndo_vlan_rx_add_vid" in struct net_device_ops.
".ndo_vlan_rx_add_vid" is not called in atomic context.

Despite never getting called from atomic context, 
i40evf_add_vlan() calls kzalloc() with GFP_ATOMIC, 
which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL, 
which can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <baijiaju1...@gmail.com>
 drivers/net/ethernet/intel/i40evf/i40evf_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_main.c 
index 1825d95..04b2b9c 100644
--- a/drivers/net/ethernet/intel/i40evf/i40evf_main.c
+++ b/drivers/net/ethernet/intel/i40evf/i40evf_main.c
@@ -770,7 +770,7 @@ i40evf_vlan_filter *i40evf_add_vlan(struct i40evf_adapter 
*adapter, u16 vlan)
        f = i40evf_find_vlan(adapter, vlan);
        if (!f) {
-               f = kzalloc(sizeof(*f), GFP_ATOMIC);
+               f = kzalloc(sizeof(*f), GFP_KERNEL);
                if (!f)
                        goto clearout;

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