gianfar: reduce stack usage in gianfar_ethtool.c

  drivers/net/gianfar_ethtool.c:765: warning: the frame size of 2048 bytes is larger than 1024 bytes

Signed-off-by: Wang Shaoyan <wangshaoyan.pt@taobao.com>
Reviewed-and-tested-by: Sebastian Pöhn <sebastian.poehn@belden.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/gianfar_ethtool.c b/drivers/net/gianfar_ethtool.c
index 6e35069..25a8c2a 100644 (file)
--- a/drivers/net/gianfar_ethtool.c
+++ b/drivers/net/gianfar_ethtool.c
@@ -686,10 +686,21 @@ static int gfar_ethflow_to_filer_table(struct gfar_private *priv, u64 ethflow, u
 {
        unsigned int last_rule_idx = priv->cur_filer_idx;
        unsigned int cmp_rqfpr;
-       unsigned int local_rqfpr[MAX_FILER_IDX + 1];
-       unsigned int local_rqfcr[MAX_FILER_IDX + 1];
+       unsigned int *local_rqfpr;
+       unsigned int *local_rqfcr;
        int i = 0x0, k = 0x0;
        int j = MAX_FILER_IDX, l = 0x0;
+       int ret = 1;
+
+       local_rqfpr = kmalloc(sizeof(unsigned int) * (MAX_FILER_IDX + 1),
+               GFP_KERNEL);
+       local_rqfcr = kmalloc(sizeof(unsigned int) * (MAX_FILER_IDX + 1),
+               GFP_KERNEL);
+       if (!local_rqfpr || !local_rqfcr) {
+               pr_err("Out of memory\n");
+               ret = 0;
+               goto err;
+       }
 
        switch (class) {
        case TCP_V4_FLOW:
@@ -706,7 +717,8 @@ static int gfar_ethflow_to_filer_table(struct gfar_private *priv, u64 ethflow, u
                break;
        default:
                pr_err("Right now this class is not supported\n");
-               return 0;
+               ret = 0;
+               goto err;
        }
 
        for (i = 0; i < MAX_FILER_IDX + 1; i++) {
@@ -721,7 +733,8 @@ static int gfar_ethflow_to_filer_table(struct gfar_private *priv, u64 ethflow, u
 
        if (i == MAX_FILER_IDX + 1) {
                pr_err("No parse rule found, can't create hash rules\n");
-               return 0;
+               ret = 0;
+               goto err;
        }
 
        /* If a match was found, then it begins the starting of a cluster rule
@@ -765,7 +778,10 @@ static int gfar_ethflow_to_filer_table(struct gfar_private *priv, u64 ethflow, u
                priv->cur_filer_idx = priv->cur_filer_idx - 1;
        }
 
-       return 1;
+err:
+       kfree(local_rqfcr);
+       kfree(local_rqfpr);
+       return ret;
 }
 
 static int gfar_set_hash_opts(struct gfar_private *priv, struct ethtool_rxnfc *cmd)