Re: [PATCH v2] mtd: Verify written data in paranoid mode
From: kernel test robot
Date: Fri May 09 2025 - 01:29:37 EST
Hi Bence,
kernel test robot noticed the following build warnings:
[auto build test WARNING on d76bb1ebb5587f66b0f8b8099bfbb44722bc08b3]
url: https://github.com/intel-lab-lkp/linux/commits/Bence-Cs-k-s/mtd-Verify-written-data-in-paranoid-mode/20250509-024044
base: d76bb1ebb5587f66b0f8b8099bfbb44722bc08b3
patch link: https://lore.kernel.org/r/20250508183733.514124-3-csokas.bence%40prolan.hu
patch subject: [PATCH v2] mtd: Verify written data in paranoid mode
config: i386-buildonly-randconfig-002-20250509 (https://download.01.org/0day-ci/archive/20250509/202505091318.0QvCicb9-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250509/202505091318.0QvCicb9-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/202505091318.0QvCicb9-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
>> drivers/mtd/mtdcore.c:1775:12: warning: '_mtd_verify' defined but not used [-Wunused-function]
1775 | static int _mtd_verify(struct mtd_info *mtd, loff_t to, size_t len, const u8 *buf)
| ^~~~~~~~~~~
vim +/_mtd_verify +1775 drivers/mtd/mtdcore.c
1774
> 1775 static int _mtd_verify(struct mtd_info *mtd, loff_t to, size_t len, const u8 *buf)
1776 {
1777 struct device *dev = &mtd->dev;
1778 u_char *verify_buf;
1779 size_t r_retlen;
1780 int ret;
1781
1782 verify_buf = devm_kmalloc(dev, len, GFP_KERNEL);
1783 if (!verify_buf)
1784 return -ENOMEM;
1785
1786 ret = mtd_read(mtd, to, len, &r_retlen, verify_buf);
1787 if (ret < 0)
1788 goto err;
1789
1790 if (len != r_retlen) {
1791 /* We shouldn't see short reads */
1792 dev_err(dev, "Verify failed, written %zd but only read %zd",
1793 len, r_retlen);
1794 ret = -EIO;
1795 goto err;
1796 }
1797
1798 if (memcmp(verify_buf, buf, len)) {
1799 dev_err(dev, "Verify failed, compare mismatch!");
1800 ret = -EIO;
1801 }
1802
1803 err:
1804 devm_kfree(dev, verify_buf);
1805 return ret;
1806 }
1807
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki