Re: [PATCH] tty: serial: mvebu-uart: Remove unused variable 'ret'

From: kernel test robot
Date: Mon Oct 05 2020 - 20:40:01 EST

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Hi Pujin,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on usb/usb-testing]
[also build test ERROR on v5.9-rc8]
[cannot apply to tty/tty-testing next-20201002]
[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/Pujin-Shi/tty-serial-mvebu-uart-Remove-unused-variable-ret/20200930-161555
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
config: powerpc-randconfig-r035-20201005 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 39fc4a0b0af69772ee360b5f729b1ec453217793)
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
# install powerpc cross compiling tool for clang build
# apt-get install binutils-powerpc-linux-gnu
# https://github.com/0day-ci/linux/commit/c2857134bbb1c0f004f4d026e62a2b90aa2015a0
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Pujin-Shi/tty-serial-mvebu-uart-Remove-unused-variable-ret/20200930-161555
git checkout c2857134bbb1c0f004f4d026e62a2b90aa2015a0
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc

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

All error/warnings (new ones prefixed by >>):

>> drivers/tty/serial/mvebu-uart.c:915:2: error: use of undeclared identifier 'ret'; did you mean 'reg'?
ret = uart_add_one_port(&mvebu_uart_driver, port);
^~~
reg
drivers/tty/serial/mvebu-uart.c:801:19: note: 'reg' declared here
struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^
>> drivers/tty/serial/mvebu-uart.c:915:6: warning: incompatible integer to pointer conversion assigning to 'struct resource *' from 'int' [-Wint-conversion]
ret = uart_add_one_port(&mvebu_uart_driver, port);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/tty/serial/mvebu-uart.c:916:6: error: use of undeclared identifier 'ret'; did you mean 'reg'?
if (ret)
^~~
reg
drivers/tty/serial/mvebu-uart.c:801:19: note: 'reg' declared here
struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^
drivers/tty/serial/mvebu-uart.c:917:10: error: use of undeclared identifier 'ret'; did you mean 'reg'?
return ret;
^~~
reg
drivers/tty/serial/mvebu-uart.c:801:19: note: 'reg' declared here
struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
^
>> drivers/tty/serial/mvebu-uart.c:917:10: warning: incompatible pointer to integer conversion returning 'struct resource *' from a function with result type 'int' [-Wint-conversion]
return ret;
^~~
2 warnings and 3 errors generated.

vim +915 drivers/tty/serial/mvebu-uart.c

94228f9561bb6c Allen Yan 2017-10-13 798
30530791a7a032 Wilson Ding 2016-02-16 799 static int mvebu_uart_probe(struct platform_device *pdev)
30530791a7a032 Wilson Ding 2016-02-16 800 {
30530791a7a032 Wilson Ding 2016-02-16 801 struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0);
5218d76958644a Miquel Raynal 2017-10-13 802 const struct of_device_id *match = of_match_device(mvebu_uart_of_match,
5218d76958644a Miquel Raynal 2017-10-13 803 &pdev->dev);
30530791a7a032 Wilson Ding 2016-02-16 804 struct uart_port *port;
5218d76958644a Miquel Raynal 2017-10-13 805 struct mvebu_uart *mvuart;
c2857134bbb1c0 Pujin Shi 2020-09-30 806 int id, irq;
30530791a7a032 Wilson Ding 2016-02-16 807
95f787685a224e Miquel Raynal 2017-10-13 808 if (!reg) {
95f787685a224e Miquel Raynal 2017-10-13 809 dev_err(&pdev->dev, "no registers defined\n");
30530791a7a032 Wilson Ding 2016-02-16 810 return -EINVAL;
30530791a7a032 Wilson Ding 2016-02-16 811 }
30530791a7a032 Wilson Ding 2016-02-16 812
32f47179833b63 Aditya Pakki 2019-03-18 813 if (!match)
32f47179833b63 Aditya Pakki 2019-03-18 814 return -ENODEV;
32f47179833b63 Aditya Pakki 2019-03-18 815
94228f9561bb6c Allen Yan 2017-10-13 816 /* Assume that all UART ports have a DT alias or none has */
94228f9561bb6c Allen Yan 2017-10-13 817 id = of_alias_get_id(pdev->dev.of_node, "serial");
94228f9561bb6c Allen Yan 2017-10-13 818 if (!pdev->dev.of_node || id < 0)
94228f9561bb6c Allen Yan 2017-10-13 819 pdev->id = uart_num_counter++;
94228f9561bb6c Allen Yan 2017-10-13 820 else
94228f9561bb6c Allen Yan 2017-10-13 821 pdev->id = id;
94228f9561bb6c Allen Yan 2017-10-13 822
94228f9561bb6c Allen Yan 2017-10-13 823 if (pdev->id >= MVEBU_NR_UARTS) {
94228f9561bb6c Allen Yan 2017-10-13 824 dev_err(&pdev->dev, "cannot have more than %d UART ports\n",
94228f9561bb6c Allen Yan 2017-10-13 825 MVEBU_NR_UARTS);
94228f9561bb6c Allen Yan 2017-10-13 826 return -EINVAL;
94228f9561bb6c Allen Yan 2017-10-13 827 }
94228f9561bb6c Allen Yan 2017-10-13 828
94228f9561bb6c Allen Yan 2017-10-13 829 port = &mvebu_uart_ports[pdev->id];
30530791a7a032 Wilson Ding 2016-02-16 830
30530791a7a032 Wilson Ding 2016-02-16 831 spin_lock_init(&port->lock);
30530791a7a032 Wilson Ding 2016-02-16 832
30530791a7a032 Wilson Ding 2016-02-16 833 port->dev = &pdev->dev;
30530791a7a032 Wilson Ding 2016-02-16 834 port->type = PORT_MVEBU;
30530791a7a032 Wilson Ding 2016-02-16 835 port->ops = &mvebu_uart_ops;
30530791a7a032 Wilson Ding 2016-02-16 836 port->regshift = 0;
30530791a7a032 Wilson Ding 2016-02-16 837
30530791a7a032 Wilson Ding 2016-02-16 838 port->fifosize = 32;
30530791a7a032 Wilson Ding 2016-02-16 839 port->iotype = UPIO_MEM32;
30530791a7a032 Wilson Ding 2016-02-16 840 port->flags = UPF_FIXED_PORT;
94228f9561bb6c Allen Yan 2017-10-13 841 port->line = pdev->id;
30530791a7a032 Wilson Ding 2016-02-16 842
95f787685a224e Miquel Raynal 2017-10-13 843 /*
95f787685a224e Miquel Raynal 2017-10-13 844 * IRQ number is not stored in this structure because we may have two of
95f787685a224e Miquel Raynal 2017-10-13 845 * them per port (RX and TX). Instead, use the driver UART structure
95f787685a224e Miquel Raynal 2017-10-13 846 * array so called ->irq[].
95f787685a224e Miquel Raynal 2017-10-13 847 */
95f787685a224e Miquel Raynal 2017-10-13 848 port->irq = 0;
30530791a7a032 Wilson Ding 2016-02-16 849 port->irqflags = 0;
30530791a7a032 Wilson Ding 2016-02-16 850 port->mapbase = reg->start;
30530791a7a032 Wilson Ding 2016-02-16 851
30530791a7a032 Wilson Ding 2016-02-16 852 port->membase = devm_ioremap_resource(&pdev->dev, reg);
30530791a7a032 Wilson Ding 2016-02-16 853 if (IS_ERR(port->membase))
4a3e208474204e tangbin 2020-03-05 854 return PTR_ERR(port->membase);
30530791a7a032 Wilson Ding 2016-02-16 855
5218d76958644a Miquel Raynal 2017-10-13 856 mvuart = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_uart),
30530791a7a032 Wilson Ding 2016-02-16 857 GFP_KERNEL);
5218d76958644a Miquel Raynal 2017-10-13 858 if (!mvuart)
30530791a7a032 Wilson Ding 2016-02-16 859 return -ENOMEM;
30530791a7a032 Wilson Ding 2016-02-16 860
68a0db1d7da20f Allen Yan 2017-10-13 861 /* Get controller data depending on the compatible string */
5218d76958644a Miquel Raynal 2017-10-13 862 mvuart->data = (struct mvebu_uart_driver_data *)match->data;
5218d76958644a Miquel Raynal 2017-10-13 863 mvuart->port = port;
30530791a7a032 Wilson Ding 2016-02-16 864
5218d76958644a Miquel Raynal 2017-10-13 865 port->private_data = mvuart;
5218d76958644a Miquel Raynal 2017-10-13 866 platform_set_drvdata(pdev, mvuart);
30530791a7a032 Wilson Ding 2016-02-16 867
68a0db1d7da20f Allen Yan 2017-10-13 868 /* Get fixed clock frequency */
68a0db1d7da20f Allen Yan 2017-10-13 869 mvuart->clk = devm_clk_get(&pdev->dev, NULL);
68a0db1d7da20f Allen Yan 2017-10-13 870 if (IS_ERR(mvuart->clk)) {
68a0db1d7da20f Allen Yan 2017-10-13 871 if (PTR_ERR(mvuart->clk) == -EPROBE_DEFER)
68a0db1d7da20f Allen Yan 2017-10-13 872 return PTR_ERR(mvuart->clk);
68a0db1d7da20f Allen Yan 2017-10-13 873
68a0db1d7da20f Allen Yan 2017-10-13 874 if (IS_EXTENDED(port)) {
68a0db1d7da20f Allen Yan 2017-10-13 875 dev_err(&pdev->dev, "unable to get UART clock\n");
68a0db1d7da20f Allen Yan 2017-10-13 876 return PTR_ERR(mvuart->clk);
68a0db1d7da20f Allen Yan 2017-10-13 877 }
68a0db1d7da20f Allen Yan 2017-10-13 878 } else {
68a0db1d7da20f Allen Yan 2017-10-13 879 if (!clk_prepare_enable(mvuart->clk))
68a0db1d7da20f Allen Yan 2017-10-13 880 port->uartclk = clk_get_rate(mvuart->clk);
68a0db1d7da20f Allen Yan 2017-10-13 881 }
68a0db1d7da20f Allen Yan 2017-10-13 882
95f787685a224e Miquel Raynal 2017-10-13 883 /* Manage interrupts */
95f787685a224e Miquel Raynal 2017-10-13 884 if (platform_irq_count(pdev) == 1) {
95f787685a224e Miquel Raynal 2017-10-13 885 /* Old bindings: no name on the single unamed UART0 IRQ */
95f787685a224e Miquel Raynal 2017-10-13 886 irq = platform_get_irq(pdev, 0);
1df217868178bd Stephen Boyd 2019-07-30 887 if (irq < 0)
95f787685a224e Miquel Raynal 2017-10-13 888 return irq;
95f787685a224e Miquel Raynal 2017-10-13 889
95f787685a224e Miquel Raynal 2017-10-13 890 mvuart->irq[UART_IRQ_SUM] = irq;
95f787685a224e Miquel Raynal 2017-10-13 891 } else {
95f787685a224e Miquel Raynal 2017-10-13 892 /*
95f787685a224e Miquel Raynal 2017-10-13 893 * New bindings: named interrupts (RX, TX) for both UARTS,
95f787685a224e Miquel Raynal 2017-10-13 894 * only make use of uart-rx and uart-tx interrupts, do not use
95f787685a224e Miquel Raynal 2017-10-13 895 * uart-sum of UART0 port.
95f787685a224e Miquel Raynal 2017-10-13 896 */
95f787685a224e Miquel Raynal 2017-10-13 897 irq = platform_get_irq_byname(pdev, "uart-rx");
1df217868178bd Stephen Boyd 2019-07-30 898 if (irq < 0)
95f787685a224e Miquel Raynal 2017-10-13 899 return irq;
95f787685a224e Miquel Raynal 2017-10-13 900
95f787685a224e Miquel Raynal 2017-10-13 901 mvuart->irq[UART_RX_IRQ] = irq;
95f787685a224e Miquel Raynal 2017-10-13 902
95f787685a224e Miquel Raynal 2017-10-13 903 irq = platform_get_irq_byname(pdev, "uart-tx");
1df217868178bd Stephen Boyd 2019-07-30 904 if (irq < 0)
95f787685a224e Miquel Raynal 2017-10-13 905 return irq;
95f787685a224e Miquel Raynal 2017-10-13 906
95f787685a224e Miquel Raynal 2017-10-13 907 mvuart->irq[UART_TX_IRQ] = irq;
95f787685a224e Miquel Raynal 2017-10-13 908 }
95f787685a224e Miquel Raynal 2017-10-13 909
9c3d3ee1239bab Allen Yan 2017-10-13 910 /* UART Soft Reset*/
9c3d3ee1239bab Allen Yan 2017-10-13 911 writel(CTRL_SOFT_RST, port->membase + UART_CTRL(port));
9c3d3ee1239bab Allen Yan 2017-10-13 912 udelay(1);
9c3d3ee1239bab Allen Yan 2017-10-13 913 writel(0, port->membase + UART_CTRL(port));
9c3d3ee1239bab Allen Yan 2017-10-13 914
30530791a7a032 Wilson Ding 2016-02-16 @915 ret = uart_add_one_port(&mvebu_uart_driver, port);
30530791a7a032 Wilson Ding 2016-02-16 916 if (ret)
30530791a7a032 Wilson Ding 2016-02-16 @917 return ret;
30530791a7a032 Wilson Ding 2016-02-16 918 return 0;
30530791a7a032 Wilson Ding 2016-02-16 919 }
30530791a7a032 Wilson Ding 2016-02-16 920

---
0-DAY CI Kernel Test Service, Intel Corporation
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