On 1/7/20 5:32 AM, Dan Carpenter wrote:
Hello Eddie James,
The patch bb3c0a27ed1d: "hwmon: (pmbus/ibm-cffps) Add new
manufacturer debugfs entries" from Dec 19, 2019, leads to the
following static checker warning:
drivers/hwmon/pmbus/ibm-cffps.c:257 ibm_cffps_debugfs_write()
error: uninitialized symbol 'data'.
drivers/hwmon/pmbus/ibm-cffps.c
238 static ssize_t ibm_cffps_debugfs_write(struct file *file,
239 const char __user *buf, size_t count,
240 loff_t *ppos)
241 {
242 u8 data;
243 ssize_t rc;
244 int *idxp = file->private_data;
245 int idx = *idxp;
246 struct ibm_cffps *psu = to_psu(idxp, idx);
247
248 switch (idx) {
249 case CFFPS_DEBUGFS_ON_OFF_CONFIG:
250 pmbus_set_page(psu->client, 0);
251
252 rc = simple_write_to_buffer(&data, 1, ppos, buf, count);
^^^^^^^^^^^^^^
If "ppos >= 1" then "data" isn't initialized but "rc" is zero.
If rc == 0 (ie if no data was read) we should probably bail out here (either return
an error or 0).
Guenter
253 if (rc < 0)
254 return rc;
255
256 rc = i2c_smbus_write_byte_data(psu->client,
257 PMBUS_ON_OFF_CONFIG, data);
258 if (rc)
259 return rc;
260
261 rc = 1;
262 break;
263 default:
264 return -EINVAL;
265 }
266
267 return rc;
268 }
regards,
dan carpenter
