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net: hns3: fix hclge_dbg_dump_tm_pg() stack usage

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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>
This commit is contained in:
Arnd Bergmann 2021-09-28 10:58:34 +02:00 committed by David S. Miller
parent c6995117b6
commit c894b51e2a
1 changed files with 24 additions and 4 deletions
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28
drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_debugfs.c
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@ -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;