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| author | Hao Lan <lanhao@huawei.com> | 2024-10-25 17:29:34 +0800 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-10-31 11:15:42 +0100 |
| commit | 2758f18a83ef283d50c0566d3f672621cc658a1a (patch) | |
| tree | e3f45061f5bf52d08857617771d6bddb50a5be29 /drivers/net | |
| parent | 662ecfc46690e92cf630f51b5d4bbbcffe102980 (diff) | |
| download | linux-2758f18a83ef283d50c0566d3f672621cc658a1a.tar.gz linux-2758f18a83ef283d50c0566d3f672621cc658a1a.tar.bz2 linux-2758f18a83ef283d50c0566d3f672621cc658a1a.zip | |
net: hns3: Resolved the issue that the debugfs query result is inconsistent.
This patch modifies the implementation of debugfs:
When the user process stops unexpectedly, not all data of the file system
is read. In this case, the save_buf pointer is not released. When the user
process is called next time, save_buf is used to copy the cached data
to the user space. As a result, the queried data is inconsistent. To solve
this problem, determine whether the function is invoked for the first time
based on the value of *ppos. If *ppos is 0, obtain the actual data.
Fixes: 5e69ea7ee2a6 ("net: hns3: refactor the debugfs process")
Signed-off-by: Hao Lan <lanhao@huawei.com>
Signed-off-by: Guangwei Zhang <zhangwangwei6@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c index 807eb3bbb11c..841e5af7b2be 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c @@ -1293,8 +1293,10 @@ static ssize_t hns3_dbg_read(struct file *filp, char __user *buffer, /* save the buffer addr until the last read operation */ *save_buf = read_buf; + } - /* get data ready for the first time to read */ + /* get data ready for the first time to read */ + if (!*ppos) { ret = hns3_dbg_read_cmd(dbg_data, hns3_dbg_cmd[index].cmd, read_buf, hns3_dbg_cmd[index].buf_len); if (ret) |