2016-03-24 18:30 GMT+02:00 Julia Lawall <julia.lawall@xxxxxxx>: > If this is correct, it seems quite subtle. > It isn't. Probably the use_smbus and use_smbus_write variables need some tweaking for better readability, but if !at24->use_smbus, then we're using i2c_transfer() and the mutex will be unlocked. Best regards, Bartosz Golaszewski > julia > > ---------- Forwarded message ---------- > Date: Fri, 25 Mar 2016 00:25:33 +0800 > From: kbuild test robot <fengguang.wu@xxxxxxxxx> > To: kbuild@xxxxxx > Cc: Julia Lawall <julia.lawall@xxxxxxx> > Subject: Re: [PATCH 04/13] eeprom: at24: make locking more fine-grained > > CC: kbuild-all@xxxxxx > In-Reply-To: <1458830767-23816-5-git-send-email-bgolaszewski@xxxxxxxxxxxx> > TO: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> > CC: Wolfram Sang <wsa@xxxxxxxxxxxxx>, linux-i2c <linux-i2c@xxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx> > CC: Andrew Lunn <andrew@xxxxxxx>, Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> > > Hi Bartosz, > > [auto build test WARNING on next-20160324] > [cannot apply to v4.5-rc7 v4.5-rc6 v4.5-rc5 v4.5] > [if your patch is applied to the wrong git tree, please drop us a note to help improving the system] > > url: https://github.com/0day-ci/linux/commits/Bartosz-Golaszewski/eeprom-support-for-at24cs-and-at24mac/20160324-230008 > :::::: branch date: 85 minutes ago > :::::: commit date: 85 minutes ago > >>> drivers/misc/eeprom/at24.c:356:3-9: preceding lock on line 312 > > git remote add linux-review https://github.com/0day-ci/linux > git remote update linux-review > git checkout 9e24d3f64066d8452c1ab00486a5a4878a30b7b1 > vim +356 drivers/misc/eeprom/at24.c > > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 306 if (!at24->use_smbus) { > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 307 int i = 0; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 308 > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 309 msg.addr = client->addr; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 310 msg.flags = 0; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 311 > 9e24d3f6 drivers/misc/eeprom/at24.c Bartosz Golaszewski 2016-03-24 @312 mutex_lock(&at24->wrbuf_lock); > 9e24d3f6 drivers/misc/eeprom/at24.c Bartosz Golaszewski 2016-03-24 313 > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 314 /* msg.buf is u8 and casts will mask the values */ > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 315 msg.buf = at24->writebuf; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 316 if (at24->chip.flags & AT24_FLAG_ADDR16) > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 317 msg.buf[i++] = offset >> 8; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 318 > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 319 msg.buf[i++] = offset; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 320 memcpy(&msg.buf[i], buf, count); > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 321 msg.len = i + count; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 322 } > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 323 > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 324 /* > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 325 * Writes fail if the previous one didn't complete yet. We may > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 326 * loop a few times until this one succeeds, waiting at least > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 327 * long enough for one entire page write to work. > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 328 */ > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 329 timeout = jiffies + msecs_to_jiffies(write_timeout); > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 330 do { > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 331 write_time = jiffies; > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 332 if (at24->use_smbus_write) { > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 333 switch (at24->use_smbus_write) { > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 334 case I2C_SMBUS_I2C_BLOCK_DATA: > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 335 status = i2c_smbus_write_i2c_block_data(client, > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 336 offset, count, buf); > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 337 break; > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 338 case I2C_SMBUS_BYTE_DATA: > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 339 status = i2c_smbus_write_byte_data(client, > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 340 offset, buf[0]); > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 341 break; > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 342 } > a839ce66 drivers/misc/eeprom/at24.c Christian Gmeiner 2014-10-09 343 > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 344 if (status == 0) > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 345 status = count; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 346 } else { > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 347 status = i2c_transfer(client->adapter, &msg, 1); > 9e24d3f6 drivers/misc/eeprom/at24.c Bartosz Golaszewski 2016-03-24 348 mutex_unlock(&at24->wrbuf_lock); > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 349 if (status == 1) > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 350 status = count; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 351 } > 2ce5b34f drivers/i2c/chips/at24.c David Brownell 2008-08-10 352 dev_dbg(&client->dev, "write %zu@%d --> %zd (%ld)\n", > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 353 count, offset, status, jiffies); > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 354 > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 355 if (status == count) > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 @356 return count; > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 357 > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 358 /* REVISIT: at HZ=100, this is sloooow */ > 2b7a5056 drivers/i2c/chips/at24.c Wolfram Sang 2008-07-14 359 msleep(1); > > :::::: The code at line 356 was first introduced by commit > :::::: 2b7a5056a0a7ff17d5d2004c29c852a92a6bd632 i2c: New-style EEPROM driver using device IDs > > :::::: TO: Wolfram Sang <w.sang@xxxxxxxxxxxxxx> > :::::: CC: Jean Delvare <khali@mahadeva.delvare> > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
