drivers/tty/serial/cpm_uart.c:1533:31: sparse: sparse: unsigned value that used to be signed checked against zero?

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d135ab453a7400a34930bdda1ef4bdc8acfac80e
commit: 831603b3e8aa3892de229fda846b2f859c518699 serial: cpm_uart: replace irq_of_parse_and_map with platform_get_irq
date:   4 months ago
config: powerpc-randconfig-r2304-20261026 (https://download.01.org/0day-ci/archive/20261027/202610270303.TbvTqZ1N-lkp@intel.com/config)
compiler: powerpc-linux-gcc (GCC) 13.5.0
sparse: v0.6.5-rc1-1-gc4640450
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261027/202610270303.TbvTqZ1N-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
| Fixes: 831603b3e8aa ("serial: cpm_uart: replace irq_of_parse_and_map with platform_get_irq")
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610270303.TbvTqZ1N-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/tty/serial/cpm_uart.c:1091:13: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct cpm_buf_desc volatile [usertype] *bdp @@     got struct cpm_buf_desc [noderef] [usertype] __iomem *rx_cur @@
   drivers/tty/serial/cpm_uart.c:1091:13: sparse:     expected struct cpm_buf_desc volatile [usertype] *bdp
   drivers/tty/serial/cpm_uart.c:1091:13: sparse:     got struct cpm_buf_desc [noderef] [usertype] __iomem *rx_cur
   drivers/tty/serial/cpm_uart.c:1110:21: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct cpm_buf_desc volatile [usertype] *bdp @@     got struct cpm_buf_desc [noderef] [usertype] __iomem *rx_bd_base @@
   drivers/tty/serial/cpm_uart.c:1110:21: sparse:     expected struct cpm_buf_desc volatile [usertype] *bdp
   drivers/tty/serial/cpm_uart.c:1110:21: sparse:     got struct cpm_buf_desc [noderef] [usertype] __iomem *rx_bd_base
   drivers/tty/serial/cpm_uart.c:1113:23: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct cpm_buf_desc [noderef] [usertype] __iomem *rx_cur @@     got struct cpm_buf_desc [usertype] * @@
   drivers/tty/serial/cpm_uart.c:1113:23: sparse:     expected struct cpm_buf_desc [noderef] [usertype] __iomem *rx_cur
   drivers/tty/serial/cpm_uart.c:1113:23: sparse:     got struct cpm_buf_desc [usertype] *
>> drivers/tty/serial/cpm_uart.c:1533:31: sparse: sparse: unsigned value that used to be signed checked against zero?
   drivers/tty/serial/cpm_uart.c:1532:43: sparse: signed value source

vim +1533 drivers/tty/serial/cpm_uart.c

  1515	
  1516	static int cpm_uart_probe(struct platform_device *ofdev)
  1517	{
  1518		int index = probe_index++;
  1519		struct uart_cpm_port *pinfo = &cpm_uart_ports[index];
  1520		int ret;
  1521	
  1522		pinfo->port.line = index;
  1523	
  1524		if (index >= UART_NR)
  1525			return -ENODEV;
  1526	
  1527		platform_set_drvdata(ofdev, pinfo);
  1528	
  1529		/* initialize the device pointer for the port */
  1530		pinfo->port.dev = &ofdev->dev;
  1531	
  1532		pinfo->port.irq = platform_get_irq(ofdev, 0);
> 1533		if (pinfo->port.irq < 0)
  1534			return pinfo->port.irq;
  1535	
  1536		ret = cpm_uart_init_port(ofdev->dev.of_node, pinfo);
  1537		if (!ret)
  1538			return uart_add_one_port(&cpm_reg, &pinfo->port);
  1539	
  1540		return ret;
  1541	}
  1542	

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