Re: [PATCH] rtc: rs5c372: Fix read the time from RTC is illegal When reading time from an uninitialized RTC chip, The value may be illegal

kernel test robot
2021-05-22T17:23:20Z

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Hi,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on abelloni/rtc-next]
[also build test ERROR on v5.13-rc2 next-20210521]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url: https://github.com/0day-ci/linux/commits/qxj511mail-gmail-com/rtc-rs5c372-Fix-read-the-time-from-RTC-is-illegal-When-reading-time-from-an-uninitialized-RTC-chip-The-value-may-be-ille/20210522-202320
base: https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git rtc-next
config: x86_64-randconfig-s031-20210522 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.3-341-g8af24329-dirty
# https://github.com/0day-ci/linux/commit/62c495535e38dc184558713e6c007071f50f516c
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review qxj511mail-gmail-com/rtc-rs5c372-Fix-read-the-time-from-RTC-is-illegal-When-reading-time-from-an-uninitialized-RTC-chip-The-value-may-be-ille/20210522-202320
git checkout 62c495535e38dc184558713e6c007071f50f516c
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' W=1 ARCH=x86_64

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

drivers/rtc/rtc-rs5c372.c: In function 'rs5c372_rtc_read_time':
>> drivers/rtc/rtc-rs5c372.c:261:3: error: implicit declaration of function 'rs5c372_rtc_set_time'; did you mean 'rs5c372_rtc_read_time'? [-Werror=implicit-function-declaration]
261 | rs5c372_rtc_set_time(dev, tm);
| ^~~~~~~~~~~~~~~~~~~~
| rs5c372_rtc_read_time
drivers/rtc/rtc-rs5c372.c: At top level:
>> drivers/rtc/rtc-rs5c372.c:273:12: error: static declaration of 'rs5c372_rtc_set_time' follows non-static declaration
273 | static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
| ^~~~~~~~~~~~~~~~~~~~
drivers/rtc/rtc-rs5c372.c:261:3: note: previous implicit declaration of 'rs5c372_rtc_set_time' was here
261 | rs5c372_rtc_set_time(dev, tm);
| ^~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +261 drivers/rtc/rtc-rs5c372.c

208
209 static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
210 {
211 struct i2c_client *client = to_i2c_client(dev);
212 struct rs5c372 *rs5c = i2c_get_clientdata(client);
213 int status = rs5c_get_regs(rs5c);
214 unsigned char ctrl2 = rs5c->regs[RS5C_REG_CTRL2];
215 int flags_utime = 0;
216
217 if (status < 0)
218 return status;
219
220 switch (rs5c->type) {
221 case rtc_r2025sd:
222 case rtc_r2221tl:
223 if ((rs5c->type == rtc_r2025sd && !(ctrl2 & R2x2x_CTRL2_XSTP)) ||
224 (rs5c->type == rtc_r2221tl && (ctrl2 & R2x2x_CTRL2_XSTP))) {
225 dev_warn(&client->dev, "rtc oscillator interruption detected. Please reset the rtc clock.\n");
226 return -EINVAL;
227 }
228 break;
229 default:
230 if (ctrl2 & RS5C_CTRL2_XSTP) {
231 dev_warn(&client->dev, "rtc oscillator interruption detected. Please reset the rtc clock.\n");
232 return -EINVAL;
233 }
234 }
235
236 tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
237 tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
238 tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);
239
240 tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
241 tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f);
242
243 if (tm->tm_mday < 1) {
244 // The value read from the register may be zero, which is an illegal value
245 flags_utime = flags_utime + 1;
246 tm->tm_mday = 1;
247 }
248
249 /* tm->tm_mon is zero-based */
250 tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;
251
252 if (tm->tm_mon < 0) {
253 flags_utime = flags_utime + 1;
254 tm->tm_mon = 0;
255 }
256
257 /* year is 1900 + tm->tm_year */
258 tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100;
259
260 if (flags_utime > 0) {
> 261 rs5c372_rtc_set_time(dev, tm);
262 }
263
264 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
265 "mday=%d, mon=%d, year=%d, wday=%d\n",
266 __func__,
267 tm->tm_sec, tm->tm_min, tm->tm_hour,
268 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
269
270 return 0;
271 }
272
> 273 static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
274 {
275 struct i2c_client *client = to_i2c_client(dev);
276 struct rs5c372 *rs5c = i2c_get_clientdata(client);
277 unsigned char buf[7];
278 unsigned char ctrl2;
279 int addr;
280
281 dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
282 "mday=%d, mon=%d, year=%d, wday=%d\n",
283 __func__,
284 tm->tm_sec, tm->tm_min, tm->tm_hour,
285 tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
286
287 addr = RS5C_ADDR(RS5C372_REG_SECS);
288 buf[0] = bin2bcd(tm->tm_sec);
289 buf[1] = bin2bcd(tm->tm_min);
290 buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour);
291 buf[3] = bin2bcd(tm->tm_wday);
292 buf[4] = bin2bcd(tm->tm_mday);
293 buf[5] = bin2bcd(tm->tm_mon + 1);
294 buf[6] = bin2bcd(tm->tm_year - 100);
295
296 if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) {
297 dev_dbg(&client->dev, "%s: write error in line %i\n",
298 __func__, __LINE__);
299 return -EIO;
300 }
301
302 addr = RS5C_ADDR(RS5C_REG_CTRL2);
303 ctrl2 = i2c_smbus_read_byte_data(client, addr);
304
305 /* clear rtc warning bits */
306 switch (rs5c->type) {
307 case rtc_r2025sd:
308 case rtc_r2221tl:
309 ctrl2 &= ~(R2x2x_CTRL2_VDET | R2x2x_CTRL2_PON);
310 if (rs5c->type == rtc_r2025sd)
311 ctrl2 |= R2x2x_CTRL2_XSTP;
312 else
313 ctrl2 &= ~R2x2x_CTRL2_XSTP;
314 break;
315 default:
316 ctrl2 &= ~RS5C_CTRL2_XSTP;
317 break;
318 }
319
320 if (i2c_smbus_write_byte_data(client, addr, ctrl2) < 0) {
321 dev_dbg(&client->dev, "%s: write error in line %i\n",
322 __func__, __LINE__);
323 return -EIO;
324 }
325
326 return 0;
327 }
328

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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