Re: [PATCH 20/22] gpio: protect the pointer to gpio_chip in gpio_device with SRCU
From: kernel test robot
Date: Tue Jan 30 2024 - 19:42:11 EST
Hi Bartosz,
kernel test robot noticed the following build errors:
[auto build test ERROR on brgl/gpio/for-next]
[also build test ERROR on linus/master v6.8-rc2 next-20240130]
[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#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Bartosz-Golaszewski/gpio-protect-the-list-of-GPIO-devices-with-SRCU/20240130-205537
base: https://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux.git gpio/for-next
patch link: https://lore.kernel.org/r/20240130124828.14678-21-brgl%40bgdev.pl
patch subject: [PATCH 20/22] gpio: protect the pointer to gpio_chip in gpio_device with SRCU
config: x86_64-buildonly-randconfig-004-20240131 (https://download.01.org/0day-ci/archive/20240131/202401310855.aA6wzlm2-lkp@xxxxxxxxx/config)
compiler: clang version 17.0.6 (https://github.com/llvm/llvm-project 6009708b4367171ccdbf4b5905cb6a803753fe18)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240131/202401310855.aA6wzlm2-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202401310855.aA6wzlm2-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
>> drivers/gpio/gpiolib-sysfs.c:481:3: error: cannot jump from this goto statement to its label
481 | goto done;
| ^
drivers/gpio/gpiolib-sysfs.c:490:25: note: jump bypasses initialization of variable with __attribute__((cleanup))
490 | CLASS(gpio_chip_guard, guard)(desc);
| ^
1 error generated.
vim +481 drivers/gpio/gpiolib-sysfs.c
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 464
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 465 /*
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 466 * /sys/class/gpio/export ... write-only
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 467 * integer N ... number of GPIO to export (full access)
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 468 * /sys/class/gpio/unexport ... write-only
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 469 * integer N ... number of GPIO to unexport
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 470 */
75a2d4226b5371 Greg Kroah-Hartman 2023-03-25 471 static ssize_t export_store(const struct class *class,
75a2d4226b5371 Greg Kroah-Hartman 2023-03-25 472 const struct class_attribute *attr,
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 473 const char *buf, size_t len)
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 474 {
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 475 struct gpio_desc *desc;
513246a34b8dc5 Bartosz Golaszewski 2023-12-21 476 int status, offset;
513246a34b8dc5 Bartosz Golaszewski 2023-12-21 477 long gpio;
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 478
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 479 status = kstrtol(buf, 0, &gpio);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 480 if (status < 0)
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 @481 goto done;
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 482
f13a0b0bb46f07 Linus Walleij 2018-09-13 483 desc = gpio_to_desc(gpio);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 484 /* reject invalid GPIOs */
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 485 if (!desc) {
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 486 pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 487 return -EINVAL;
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 488 }
2796d5332f8ac8 Bartosz Golaszewski 2024-01-30 489
2796d5332f8ac8 Bartosz Golaszewski 2024-01-30 490 CLASS(gpio_chip_guard, guard)(desc);
2796d5332f8ac8 Bartosz Golaszewski 2024-01-30 491 if (!guard.gc)
2796d5332f8ac8 Bartosz Golaszewski 2024-01-30 492 return -ENODEV;
2796d5332f8ac8 Bartosz Golaszewski 2024-01-30 493
23cf00ddd2e1aa Matti Vaittinen 2021-03-29 494 offset = gpio_chip_hwgpio(desc);
2796d5332f8ac8 Bartosz Golaszewski 2024-01-30 495 if (!gpiochip_line_is_valid(guard.gc, offset)) {
23cf00ddd2e1aa Matti Vaittinen 2021-03-29 496 pr_warn("%s: GPIO %ld masked\n", __func__, gpio);
23cf00ddd2e1aa Matti Vaittinen 2021-03-29 497 return -EINVAL;
23cf00ddd2e1aa Matti Vaittinen 2021-03-29 498 }
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 499
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 500 /* No extra locking here; FLAG_SYSFS just signifies that the
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 501 * request and export were done by on behalf of userspace, so
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 502 * they may be undone on its behalf too.
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 503 */
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 504
95a4eed7dd5b7c Andy Shevchenko 2022-02-01 505 status = gpiod_request_user(desc, "sysfs");
95a4eed7dd5b7c Andy Shevchenko 2022-02-01 506 if (status)
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 507 goto done;
e10f72bf4b3e88 Andrew Jeffery 2017-11-30 508
e10f72bf4b3e88 Andrew Jeffery 2017-11-30 509 status = gpiod_set_transitory(desc, false);
95dd1e34ff5bbe Boerge Struempfel 2023-11-29 510 if (status) {
95dd1e34ff5bbe Boerge Struempfel 2023-11-29 511 gpiod_free(desc);
95dd1e34ff5bbe Boerge Struempfel 2023-11-29 512 goto done;
95dd1e34ff5bbe Boerge Struempfel 2023-11-29 513 }
95dd1e34ff5bbe Boerge Struempfel 2023-11-29 514
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 515 status = gpiod_export(desc, true);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 516 if (status < 0)
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 517 gpiod_free(desc);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 518 else
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 519 set_bit(FLAG_SYSFS, &desc->flags);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 520
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 521 done:
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 522 if (status)
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 523 pr_debug("%s: status %d\n", __func__, status);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 524 return status ? : len;
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 525 }
d83bb159f4c6af Greg Kroah-Hartman 2017-06-08 526 static CLASS_ATTR_WO(export);
0eb4c6c2671ca0 Alexandre Courbot 2014-07-01 527
--
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