[PATCH] hinic: reduce rss_init stack usage

[Arnd Bergmann]

On 32-bit architectures, putting an array of 256 u32 values on the
stack uses more space than the warning limit:

drivers/net/ethernet/huawei/hinic/hinic_main.c: In function 'hinic_rss_init':
drivers/net/ethernet/huawei/hinic/hinic_main.c:286:1: error: the frame size of 
1068 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]

I considered changing the code to use u8 values here, since that's
all the hardware supports, but dynamically allocating the array is
a more isolated fix here.

Signed-off-by: Arnd Bergmann <a...@arndb.de>
---
 .../net/ethernet/huawei/hinic/hinic_main.c    | 20 ++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/huawei/hinic/hinic_main.c 
b/drivers/net/ethernet/huawei/hinic/hinic_main.c
index 1b917543feac..ceb0e247f52d 100644
--- a/drivers/net/ethernet/huawei/hinic/hinic_main.c
+++ b/drivers/net/ethernet/huawei/hinic/hinic_main.c
@@ -256,37 +256,43 @@ static int hinic_configure_max_qnum(struct hinic_dev 
*nic_dev)
 
 static int hinic_rss_init(struct hinic_dev *nic_dev)
 {
-       u32 indir_tbl[HINIC_RSS_INDIR_SIZE] = { 0 };
        u8 default_rss_key[HINIC_RSS_KEY_SIZE];
        u8 tmpl_idx = nic_dev->rss_tmpl_idx;
+       u32 *indir_tbl;
        int err, i;
 
+       indir_tbl = kcalloc(HINIC_RSS_INDIR_SIZE, sizeof(u32), GFP_KERNEL);
+       if (!indir_tbl)
+               return -ENOMEM;
+
        netdev_rss_key_fill(default_rss_key, sizeof(default_rss_key));
        for (i = 0; i < HINIC_RSS_INDIR_SIZE; i++)
                indir_tbl[i] = ethtool_rxfh_indir_default(i, nic_dev->num_rss);
 
        err = hinic_rss_set_template_tbl(nic_dev, tmpl_idx, default_rss_key);
        if (err)
-               return err;
+               goto out;
 
        err = hinic_rss_set_indir_tbl(nic_dev, tmpl_idx, indir_tbl);
        if (err)
-               return err;
+               goto out;
 
        err = hinic_set_rss_type(nic_dev, tmpl_idx, nic_dev->rss_type);
        if (err)
-               return err;
+               goto out;
 
        err = hinic_rss_set_hash_engine(nic_dev, tmpl_idx,
                                        nic_dev->rss_hash_engine);
        if (err)
-               return err;
+               goto out;
 
        err = hinic_rss_cfg(nic_dev, 1, tmpl_idx);
        if (err)
-               return err;
+               goto out;
 
-       return 0;
+out:
+       kfree(indir_tbl);
+       return err;
 }
 
 static void hinic_rss_deinit(struct hinic_dev *nic_dev)
-- 
2.20.0