net: hns3: fix hclge_dbg_dump_tm_pg() stack usage

This function copies strings around between multiple buffers
including a large on-stack array that causes a build warning
on 32-bit systems:

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c: In function 'hclge_dbg_dump_tm_pg':
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c:782:1: error: the frame size of 1424 bytes is larger than 1400 bytes [-Werror=frame-larger-than=]

The function can probably be cleaned up a lot, to go back to
printing directly into the output buffer, but dynamically allocating
the structure is a simpler workaround for now.

Fixes: 04d96139ddb3 ("net: hns3: refine function hclge_dbg_dump_tm_pri()")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
index 87d96f8..32f62cd 100644 (file)
--- a/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
@@ -719,9 +719,9 @@ static void hclge_dbg_fill_shaper_content(struct hclge_tm_shaper_para *para,
        sprintf(result[(*index)++], "%6u", para->rate);
 }
 
-static int hclge_dbg_dump_tm_pg(struct hclge_dev *hdev, char *buf, int len)
+static int __hclge_dbg_dump_tm_pg(struct hclge_dev *hdev, char *data_str,
+                                 char *buf, int len)
 {
-       char data_str[ARRAY_SIZE(tm_pg_items)][HCLGE_DBG_DATA_STR_LEN];
        struct hclge_tm_shaper_para c_shaper_para, p_shaper_para;
        char *result[ARRAY_SIZE(tm_pg_items)], *sch_mode_str;
        u8 pg_id, sch_mode, weight, pri_bit_map, i, j;
@@ -729,8 +729,10 @@ static int hclge_dbg_dump_tm_pg(struct hclge_dev *hdev, char *buf, int len)
        int pos = 0;
        int ret;
 
-       for (i = 0; i < ARRAY_SIZE(tm_pg_items); i++)
-               result[i] = &data_str[i][0];
+       for (i = 0; i < ARRAY_SIZE(tm_pg_items); i++) {
+               result[i] = data_str;
+               data_str += HCLGE_DBG_DATA_STR_LEN;
+       }
 
        hclge_dbg_fill_content(content, sizeof(content), tm_pg_items,
                               NULL, ARRAY_SIZE(tm_pg_items));
@@ -781,6 +783,24 @@ static int hclge_dbg_dump_tm_pg(struct hclge_dev *hdev, char *buf, int len)
        return 0;
 }
 
+static int hclge_dbg_dump_tm_pg(struct hclge_dev *hdev, char *buf, int len)
+{
+       char *data_str;
+       int ret;
+
+       data_str = kcalloc(ARRAY_SIZE(tm_pg_items),
+                          HCLGE_DBG_DATA_STR_LEN, GFP_KERNEL);
+
+       if (!data_str)
+               return -ENOMEM;
+
+       ret = __hclge_dbg_dump_tm_pg(hdev, data_str, buf, len);
+
+       kfree(data_str);
+
+       return ret;
+}
+
 static int hclge_dbg_dump_tm_port(struct hclge_dev *hdev,  char *buf, int len)
 {
        struct hclge_tm_shaper_para shaper_para;