Re: [PATCH v2 1/1] tpm/tpm_i2c_infineon: Fix init endian vendor check

From: kernel test robot
Date: Mon Sep 13 2021 - 14:31:52 EST

Hi Florian,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[also build test WARNING on v5.15-rc1 next-20210913]
[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/Florian-Eckert/tpm-tpm_i2c_infineon-Fix-init-endian-vendor-check/20210913-201852
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f
config: i386-randconfig-s001-20210913 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-dirty
# https://github.com/0day-ci/linux/commit/454ecd483731a2a7c88ae1fa6e428f3c00c1669f
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Florian-Eckert/tpm-tpm_i2c_infineon-Fix-init-endian-vendor-check/20210913-201852
git checkout 454ecd483731a2a7c88ae1fa6e428f3c00c1669f
# save the attached .config to linux build tree
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash drivers/char/tpm/

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


sparse warnings: (new ones prefixed by >>)
>> drivers/char/tpm/tpm_i2c_infineon.c:641:13: sparse: sparse: restricted __le32 degrades to integer
drivers/char/tpm/tpm_i2c_infineon.c:643:20: sparse: sparse: restricted __le32 degrades to integer
drivers/char/tpm/tpm_i2c_infineon.c:651:9: sparse: sparse: restricted __le32 degrades to integer

vim +641 drivers/char/tpm/tpm_i2c_infineon.c

aad628c1d91a6d Peter Huewe 2012-08-07 611
afc6d36912f3f3 Bill Pemberton 2012-11-19 612 static int tpm_tis_i2c_init(struct device *dev)
aad628c1d91a6d Peter Huewe 2012-08-07 613 {
454ecd483731a2 Florian Eckert 2021-09-13 614 __le32 vendor;
aad628c1d91a6d Peter Huewe 2012-08-07 615 int rc = 0;
aad628c1d91a6d Peter Huewe 2012-08-07 616 struct tpm_chip *chip;
aad628c1d91a6d Peter Huewe 2012-08-07 617
afb5abc262e962 Jarkko Sakkinen 2014-12-12 618 chip = tpmm_chip_alloc(dev, &tpm_tis_i2c);
afb5abc262e962 Jarkko Sakkinen 2014-12-12 619 if (IS_ERR(chip))
afb5abc262e962 Jarkko Sakkinen 2014-12-12 620 return PTR_ERR(chip);
aad628c1d91a6d Peter Huewe 2012-08-07 621
aad628c1d91a6d Peter Huewe 2012-08-07 622 /* Default timeouts */
af782f339a5d6e Christophe Ricard 2016-03-31 623 chip->timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
af782f339a5d6e Christophe Ricard 2016-03-31 624 chip->timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
af782f339a5d6e Christophe Ricard 2016-03-31 625 chip->timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
af782f339a5d6e Christophe Ricard 2016-03-31 626 chip->timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
aad628c1d91a6d Peter Huewe 2012-08-07 627
aad628c1d91a6d Peter Huewe 2012-08-07 628 if (request_locality(chip, 0) != 0) {
c61c86dd6e0a80 Peter Huewe 2013-03-04 629 dev_err(dev, "could not request locality\n");
aad628c1d91a6d Peter Huewe 2012-08-07 630 rc = -ENODEV;
afb5abc262e962 Jarkko Sakkinen 2014-12-12 631 goto out_err;
aad628c1d91a6d Peter Huewe 2012-08-07 632 }
aad628c1d91a6d Peter Huewe 2012-08-07 633
aad628c1d91a6d Peter Huewe 2012-08-07 634 /* read four bytes from DID_VID register */
aad628c1d91a6d Peter Huewe 2012-08-07 635 if (iic_tpm_read(TPM_DID_VID(0), (u8 *)&vendor, 4) < 0) {
c61c86dd6e0a80 Peter Huewe 2013-03-04 636 dev_err(dev, "could not read vendor id\n");
aad628c1d91a6d Peter Huewe 2012-08-07 637 rc = -EIO;
aad628c1d91a6d Peter Huewe 2012-08-07 638 goto out_release;
aad628c1d91a6d Peter Huewe 2012-08-07 639 }
aad628c1d91a6d Peter Huewe 2012-08-07 640
c61c86dd6e0a80 Peter Huewe 2013-03-04 @641 if (vendor == TPM_TIS_I2C_DID_VID_9645) {
c61c86dd6e0a80 Peter Huewe 2013-03-04 642 tpm_dev.chip_type = SLB9645;
c61c86dd6e0a80 Peter Huewe 2013-03-04 643 } else if (vendor == TPM_TIS_I2C_DID_VID_9635) {
c61c86dd6e0a80 Peter Huewe 2013-03-04 644 tpm_dev.chip_type = SLB9635;
c61c86dd6e0a80 Peter Huewe 2013-03-04 645 } else {
c61c86dd6e0a80 Peter Huewe 2013-03-04 646 dev_err(dev, "vendor id did not match! ID was %08x\n", vendor);
aad628c1d91a6d Peter Huewe 2012-08-07 647 rc = -ENODEV;
aad628c1d91a6d Peter Huewe 2012-08-07 648 goto out_release;
aad628c1d91a6d Peter Huewe 2012-08-07 649 }
aad628c1d91a6d Peter Huewe 2012-08-07 650
aad628c1d91a6d Peter Huewe 2012-08-07 651 dev_info(dev, "1.2 TPM (device-id 0x%X)\n", vendor >> 16);
aad628c1d91a6d Peter Huewe 2012-08-07 652
aad628c1d91a6d Peter Huewe 2012-08-07 653 tpm_dev.chip = chip;
aad628c1d91a6d Peter Huewe 2012-08-07 654
afb5abc262e962 Jarkko Sakkinen 2014-12-12 655 return tpm_chip_register(chip);
aad628c1d91a6d Peter Huewe 2012-08-07 656 out_release:
56671c893e0e3e Christophe Ricard 2016-03-31 657 release_locality(chip, tpm_dev.locality, 1);
aad628c1d91a6d Peter Huewe 2012-08-07 658 tpm_dev.client = NULL;
aad628c1d91a6d Peter Huewe 2012-08-07 659 out_err:
aad628c1d91a6d Peter Huewe 2012-08-07 660 return rc;
aad628c1d91a6d Peter Huewe 2012-08-07 661 }
aad628c1d91a6d Peter Huewe 2012-08-07 662

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