[stefandoesinger-zx297520:dlink 132/132] drivers/misc/cardreader/infineon_usim.c:190:21: warning: unused variable 'i'

[stefandoesinger-zx297520:dlink 132/132] drivers/misc/cardreader/infineon_usim.c:190:21: warning: unused variable 'i'

[kernel test robot]

tree:   https://gitlab.com/stefandoesinger/zx297520-kernel dlink
head:   ac919b52585145716ddb9d8154ca104ff2ea271b
commit: ac919b52585145716ddb9d8154ca104ff2ea271b [132/132] Sloppy APDU
config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20260909/202609091356.2pWHOzol-lkp@intel.com/config)
compiler: sh4-linux-gcc (GCC) 16.1.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260909/202609091356.2pWHOzol-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202609091356.2pWHOzol-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/misc/cardreader/infineon_usim.c: In function 'usim_read_atr':
>> drivers/misc/cardreader/infineon_usim.c:190:21: warning: unused variable 'i' [-Wunused-variable]
     190 |         size_t len, i;
         |                     ^


vim +/i +190 drivers/misc/cardreader/infineon_usim.c

   184	
   185	static int usim_read_atr(struct usim_drv *usim, u8 *atr, u32 *atr_length, u32 *flags_inout)
   186	{
   187		u32 control, flags = *flags_inout;
   188		const char *convention = "error";
   189		int ret = 0;
 > 190		size_t len, i;
   191		u8 value;
   192	
   193		/* Read the ATR solely based on timeout. Don't try to be smart and parse incoming values to
   194		 * deduce a length. It is complicated logic and userspace validated the ATR anyway.
   195		 */
   196		flags &= (INFINEON_USIM_DIRECT_CONVENTION | INFINEON_USIM_INVERSE_CONVENTION);
   197	
   198		for (len = 0; len < INFINEON_USIM_ATR_MAX; ++len) {
   199			ret = usim_receive_char(usim, &value, USIM_ATR_TIMEOUT_MS);
   200	
   201			if (ret == -ETIMEDOUT)
   202				break;
   203	
   204			atr[len] = value;
   205			if (len)
   206				continue;
   207	
   208			/* Direct / Indirect convention handling: If specified by the client, apply it after
   209			 * reading the first byte.
   210			 *
   211			 * If left automatic, try to detect it based on the first byte: If it read without
   212			 * a parity error, assume direct. Otherwise, check for 0x03 ox 0x3f, fix it u and
   213			 * ignore the parity error.
   214			 */
   215			if (flags & INFINEON_USIM_DIRECT_CONVENTION) {
   216				/* do nothing */
   217				convention = "direct (requested)";
   218			} else if (!ret) {
   219				convention = "direct (detected)";
   220				flags |= INFINEON_USIM_DIRECT_CONVENTION;
   221			} else if (ret == -EBADMSG && (value == 0x03 || value == 0x3f)) {
   222				ret = 0;
   223				value = 0x3f;
   224	
   225				if (!flags) {
   226					convention = "inverse (detected)";
   227					flags |= INFINEON_USIM_INVERSE_CONVENTION;
   228				} else {
   229					convention = "inverse (requested)";
   230				}
   231	
   232				control = usim_readl(usim, USIM_REG_CONTROL);
   233				control |= USIM_CONTROL_INVERSE_CONVENTION;
   234				usim_writel(usim, control, USIM_REG_CONTROL);
   235			}
   236		}
   237		dev_dbg(usim->dev, "received ATR with %zu bytes, convention %s\n", len, convention);
   238	
   239		if (len == INFINEON_USIM_ATR_MAX)
   240			return -EOVERFLOW;
   241	
   242		*atr_length = len;
   243		*flags_inout |= flags;
   244	
   245		return 0;
   246	}
   247	

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