drivers/scsi/qedi/qedi_debugfs.c:109:45: sparse: sparse: incorrect type in argument 2 (different address spaces)

[kernel test robot <lkp@intel.com>]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   4e99b32169e84b4ece5a1d74eb0b7e4ef07866b3
commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces
date:   9 days ago
config: x86_64-randconfig-s021-20200628 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-13) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-dirty
        git checkout 670d0a4b10704667765f7d18f7592993d02783aa
        # save the attached .config to linux build tree
        make W=1 C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

>> drivers/scsi/qedi/qedi_debugfs.c:109:45: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected char const * @@     got char const [noderef] __user *buffer @@
   drivers/scsi/qedi/qedi_debugfs.c:109:45: sparse:     expected char const *
>> drivers/scsi/qedi/qedi_debugfs.c:109:45: sparse:     got char const [noderef] __user *buffer
>> drivers/scsi/qedi/qedi_debugfs.c:128:23: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected char *buf @@     got char [noderef] __user *buffer @@
   drivers/scsi/qedi/qedi_debugfs.c:128:23: sparse:     expected char *buf
>> drivers/scsi/qedi/qedi_debugfs.c:128:23: sparse:     got char [noderef] __user *buffer
   drivers/scsi/qedi/qedi_debugfs.c:154:41: sparse: sparse: restricted __le16 degrades to integer

vim +109 drivers/scsi/qedi/qedi_debugfs.c

ace7f46ba5fde7 Manish Rangankar 2016-12-01   92  
ace7f46ba5fde7 Manish Rangankar 2016-12-01   93  static ssize_t
ace7f46ba5fde7 Manish Rangankar 2016-12-01   94  qedi_dbg_do_not_recover_cmd_write(struct file *filp, const char __user *buffer,
ace7f46ba5fde7 Manish Rangankar 2016-12-01   95  				  size_t count, loff_t *ppos)
ace7f46ba5fde7 Manish Rangankar 2016-12-01   96  {
ace7f46ba5fde7 Manish Rangankar 2016-12-01   97  	size_t cnt = 0;
ace7f46ba5fde7 Manish Rangankar 2016-12-01   98  	struct qedi_dbg_ctx *qedi_dbg =
ace7f46ba5fde7 Manish Rangankar 2016-12-01   99  			(struct qedi_dbg_ctx *)filp->private_data;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  100  	struct qedi_list_of_funcs *lof = qedi_dbg_do_not_recover_ops;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  101  
ace7f46ba5fde7 Manish Rangankar 2016-12-01  102  	if (*ppos)
ace7f46ba5fde7 Manish Rangankar 2016-12-01  103  		return 0;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  104  
ace7f46ba5fde7 Manish Rangankar 2016-12-01  105  	while (lof) {
ace7f46ba5fde7 Manish Rangankar 2016-12-01  106  		if (!(lof->oper_str))
ace7f46ba5fde7 Manish Rangankar 2016-12-01  107  			break;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  108  
ace7f46ba5fde7 Manish Rangankar 2016-12-01 @109  		if (!strncmp(lof->oper_str, buffer, strlen(lof->oper_str))) {
ace7f46ba5fde7 Manish Rangankar 2016-12-01  110  			cnt = lof->oper_func(qedi_dbg);
ace7f46ba5fde7 Manish Rangankar 2016-12-01  111  			break;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  112  		}
ace7f46ba5fde7 Manish Rangankar 2016-12-01  113  
ace7f46ba5fde7 Manish Rangankar 2016-12-01  114  		lof++;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  115  	}
ace7f46ba5fde7 Manish Rangankar 2016-12-01  116  	return (count - cnt);
ace7f46ba5fde7 Manish Rangankar 2016-12-01  117  }
ace7f46ba5fde7 Manish Rangankar 2016-12-01  118  
ace7f46ba5fde7 Manish Rangankar 2016-12-01  119  static ssize_t
ace7f46ba5fde7 Manish Rangankar 2016-12-01  120  qedi_dbg_do_not_recover_cmd_read(struct file *filp, char __user *buffer,
ace7f46ba5fde7 Manish Rangankar 2016-12-01  121  				 size_t count, loff_t *ppos)
ace7f46ba5fde7 Manish Rangankar 2016-12-01  122  {
ace7f46ba5fde7 Manish Rangankar 2016-12-01  123  	size_t cnt = 0;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  124  
ace7f46ba5fde7 Manish Rangankar 2016-12-01  125  	if (*ppos)
ace7f46ba5fde7 Manish Rangankar 2016-12-01  126  		return 0;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  127  
bd571195c9535c Arnd Bergmann    2017-03-02 @128  	cnt = sprintf(buffer, "do_not_recover=%d\n", qedi_do_not_recover);
ace7f46ba5fde7 Manish Rangankar 2016-12-01  129  	cnt = min_t(int, count, cnt - *ppos);
ace7f46ba5fde7 Manish Rangankar 2016-12-01  130  	*ppos += cnt;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  131  	return cnt;
ace7f46ba5fde7 Manish Rangankar 2016-12-01  132  }
ace7f46ba5fde7 Manish Rangankar 2016-12-01  133  

:::::: The code at line 109 was first introduced by commit
:::::: ace7f46ba5fde7273207c7122b0650ceb72510e0 scsi: qedi: Add QLogic FastLinQ offload iSCSI driver framework.

:::::: TO: Manish Rangankar <manish.rangankar@cavium.com>
:::::: CC: Martin K. Petersen <martin.petersen@oracle.com>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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