Re: [PATCH v1] tpm_tis_spi_main: set cs_change = 0 when timesout

[kernel test robot <lkp@xxxxxxxxx>]

Hi wanghongzhe,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on char-misc/char-misc-testing]
[also build test ERROR on v5.11-rc6 next-20210125]
[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/wanghongzhe/tpm_tis_spi_main-set-cs_change-0-when-timesout/20210205-140104
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git 3a11b0b5d8d2b3f7d4b44945ef9226a3115bb15f
config: nios2-allyesconfig (attached as .config)
compiler: nios2-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/42343d4238cfd18831ed331b153cc6d2c0a7bc33
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review wanghongzhe/tpm_tis_spi_main-set-cs_change-0-when-timesout/20210205-140104
        git checkout 42343d4238cfd18831ed331b153cc6d2c0a7bc33
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 

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

All errors (new ones prefixed by >>):

   drivers/char/tpm/tpm_tis_spi_main.c: In function 'tpm_tis_spi_flow_control':
>> drivers/char/tpm/tpm_tis_spi_main.c:72:12: error: 'spi_xfer' is a pointer; did you mean to use '->'?
      72 |    spi_xfer.cs_change = 0;
         |            ^
         |            ->
   At top level:
   drivers/char/tpm/tpm_tis_spi_main.c:288:36: warning: 'acpi_tis_spi_match' defined but not used [-Wunused-const-variable=]
     288 | static const struct acpi_device_id acpi_tis_spi_match[] = {
         |                                    ^~~~~~~~~~~~~~~~~~


vim +72 drivers/char/tpm/tpm_tis_spi_main.c

    40	
    41	/*
    42	 * TCG SPI flow control is documented in section 6.4 of the spec[1]. In short,
    43	 * keep trying to read from the device until MISO goes high indicating the
    44	 * wait state has ended.
    45	 *
    46	 * [1] https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
    47	 */
    48	static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy,
    49					    struct spi_transfer *spi_xfer)
    50	{
    51		struct spi_message m;
    52		int ret, i;
    53	
    54		if ((phy->iobuf[3] & 0x01) == 0) {
    55			// handle SPI wait states
    56			for (i = 0; i < TPM_RETRY; i++) {
    57				spi_xfer->len = 1;
    58				spi_message_init(&m);
    59				spi_message_add_tail(spi_xfer, &m);
    60				ret = spi_sync_locked(phy->spi_device, &m);
    61				if (ret < 0)
    62					return ret;
    63				if (phy->iobuf[0] & 0x01)
    64					break;
    65			}
    66	
    67			if (i == TPM_RETRY) {
    68				/* change back to 'high',
    69				 * So the TPM chips thinks the last communication
    70				 * is done.
    71				 */
  > 72				spi_xfer.cs_change = 0;
    73				spi_xfer->len = 1;
    74				spi_message_init(&m);
    75				spi_message_add_tail(spi_xfer, &m);
    76				ret = spi_sync_locked(phy->spi_device, &m);
    77				return -ETIMEDOUT;
    78			}
    79		}
    80	
    81		return 0;
    82	}
    83	

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0-DAY CI Kernel Test Service, Intel Corporation
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