[jirislaby:devel 35/59] net/nfc/nci/uart.c:253:37: warning: passing argument 3 of 'nu->ops.recv_buf' discards 'const' qualifier from pointer target type

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git devel
head:   762f71019fe44ea4d7c7eb082b89631ca72c2fc9
commit: 19191c4b66e0e08abe286780faed0a6fceb818a5 [35/59] const fp of receive_buf
config: arm-defconfig (attached as .config)
compiler: arm-linux-gnueabi-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://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git/commit/?id=19191c4b66e0e08abe286780faed0a6fceb818a5
        git remote add jirislaby https://git.kernel.org/pub/scm/linux/kernel/git/jirislaby/linux.git
        git fetch --no-tags jirislaby devel
        git checkout 19191c4b66e0e08abe286780faed0a6fceb818a5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 

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

All warnings (new ones prefixed by >>):

   net/nfc/nci/uart.c: In function 'nci_uart_tty_receive':
>> net/nfc/nci/uart.c:253:37: warning: passing argument 3 of 'nu->ops.recv_buf' discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
     253 |  nu->ops.recv_buf(nu, (void *)data, flags, count);
         |                                     ^~~~~
   net/nfc/nci/uart.c:253:37: note: expected 'char *' but argument is of type 'const char *'


vim +253 net/nfc/nci/uart.c

9961127d4bce6325 Vincent Cuissard 2015-06-11  231  
9961127d4bce6325 Vincent Cuissard 2015-06-11  232  /* nci_uart_tty_receive()
9961127d4bce6325 Vincent Cuissard 2015-06-11  233   *
9961127d4bce6325 Vincent Cuissard 2015-06-11  234   *     Called by tty low level driver when receive data is
9961127d4bce6325 Vincent Cuissard 2015-06-11  235   *     available.
9961127d4bce6325 Vincent Cuissard 2015-06-11  236   *
9961127d4bce6325 Vincent Cuissard 2015-06-11  237   * Arguments:  tty          pointer to tty isntance data
9961127d4bce6325 Vincent Cuissard 2015-06-11  238   *             data         pointer to received data
9961127d4bce6325 Vincent Cuissard 2015-06-11  239   *             flags        pointer to flags for data
9961127d4bce6325 Vincent Cuissard 2015-06-11  240   *             count        count of received data in bytes
9961127d4bce6325 Vincent Cuissard 2015-06-11  241   *
9961127d4bce6325 Vincent Cuissard 2015-06-11  242   * Return Value:    None
9961127d4bce6325 Vincent Cuissard 2015-06-11  243   */
9961127d4bce6325 Vincent Cuissard 2015-06-11  244  static void nci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
19191c4b66e0e08a Jiri Slaby       2021-01-22  245  				 const char *flags, int count)
9961127d4bce6325 Vincent Cuissard 2015-06-11  246  {
9961127d4bce6325 Vincent Cuissard 2015-06-11  247  	struct nci_uart *nu = (void *)tty->disc_data;
9961127d4bce6325 Vincent Cuissard 2015-06-11  248  
9961127d4bce6325 Vincent Cuissard 2015-06-11  249  	if (!nu || tty != nu->tty)
9961127d4bce6325 Vincent Cuissard 2015-06-11  250  		return;
9961127d4bce6325 Vincent Cuissard 2015-06-11  251  
9961127d4bce6325 Vincent Cuissard 2015-06-11  252  	spin_lock(&nu->rx_lock);
9961127d4bce6325 Vincent Cuissard 2015-06-11 @253  	nu->ops.recv_buf(nu, (void *)data, flags, count);
9961127d4bce6325 Vincent Cuissard 2015-06-11  254  	spin_unlock(&nu->rx_lock);
9961127d4bce6325 Vincent Cuissard 2015-06-11  255  
9961127d4bce6325 Vincent Cuissard 2015-06-11  256  	tty_unthrottle(tty);
9961127d4bce6325 Vincent Cuissard 2015-06-11  257  }
9961127d4bce6325 Vincent Cuissard 2015-06-11  258  

:::::: The code at line 253 was first introduced by commit
:::::: 9961127d4bce6325e9a0b0fb105e0c85a6c62cb7 NFC: nci: add generic uart support

:::::: TO: Vincent Cuissard <cuissard@marvell.com>
:::::: CC: Samuel Ortiz <sameo@linux.intel.com>

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

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