From: Yufeng Mo moyufeng@huawei.com
mainline inclusion from mainline-v5.14-rc7 commit 55649d56541bebecfd45ecd14f02944190538a66 category: bugfix bugzilla: NA CVE: NA DTS: DTS2021090315802
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Currently, the cmd index is obtained in debugfs by comparing file names. However, this method may cause errors when processing more complex file names. So, change this method by saving cmd in private data and comparing it when getting cmd index in debugfs for optimization.
Fixes: 5e69ea7ee2a6 ("net: hns3: refactor the debugfs process") Signed-off-by: Yufeng Mo moyufeng@huawei.com Signed-off-by: Guangbin Huang huangguangbin2@huawei.com Signed-off-by: Yonglong Liu liuyonglong@huawei.com --- drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c | 14 +++++++------- drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.h | 1 + 2 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c index dd71d4b871a4..602d9f0150e0 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c @@ -813,20 +813,19 @@ static ssize_t hns3_dbg_cmd_write(struct file *filp, const char __user *buffer, return count; }
-static int hns3_dbg_get_cmd_index(struct hnae3_handle *handle, - const unsigned char *name, u32 *index) +static int hns3_dbg_get_cmd_index(struct hns3_dbg_data *dbg_data, u32 *index) { u32 i;
for (i = 0; i < ARRAY_SIZE(hns3_dbg_cmd); i++) { - if (!strncmp(name, hns3_dbg_cmd[i].name, - strlen(hns3_dbg_cmd[i].name))) { + if (hns3_dbg_cmd[i].cmd == dbg_data->cmd) { *index = i; return 0; } }
- dev_err(&handle->pdev->dev, "unknown command(%s)\n", name); + dev_err(&dbg_data->handle->pdev->dev, "unknown command(%d)\n", + dbg_data->cmd); return -EINVAL; }
@@ -890,8 +889,7 @@ static ssize_t hns3_dbg_read(struct file *filp, char __user *buffer, u32 index; int ret;
- ret = hns3_dbg_get_cmd_index(handle, filp->f_path.dentry->d_iname, - &index); + ret = hns3_dbg_get_cmd_index(dbg_data, &index); if (ret) return ret;
@@ -968,6 +966,7 @@ static int hns3_dbg_bd_file_init(struct hnae3_handle *handle, u32 cmd) char name[HNS3_DBG_FILE_NAME_LEN];
data[i].handle = handle; + data[i].cmd = hns3_dbg_cmd[cmd].cmd; data[i].qid = i; sprintf(name, "%s%u", hns3_dbg_cmd[cmd].name, i); debugfs_create_file(name, 0400, entry_dir, &data[i], @@ -987,6 +986,7 @@ static int hns3_dbg_common_file_init(struct hnae3_handle *handle, u32 cmd) return -ENOMEM;
data->handle = handle; + data->cmd = hns3_dbg_cmd[cmd].cmd; entry_dir = hns3_dbg_dentry[hns3_dbg_cmd[cmd].dentry].dentry; debugfs_create_file(hns3_dbg_cmd[cmd].name, 0400, entry_dir, data, &hns3_dbg_fops); diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.h b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.h index 2fa3030d5b5b..ea65e5174ea9 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.h +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.h @@ -24,6 +24,7 @@ struct hns3_dbg_item {
struct hns3_dbg_data { struct hnae3_handle *handle; + enum hnae3_dbg_cmd cmd; u16 qid; };