Re: [PATCH v2 1/2] axis-fifo: use devm_kasprintf() for allocating formatted strings

From: Dan Carpenter
Date: Mon May 15 2023 - 03:43:10 EST

Hi Prathu,

kernel test robot noticed the following build warnings:

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Prathu-Baronia/axis-fifo-cleanup-space-issues-with-fops-struct/20230514-220201
base: staging/staging-testing
patch link: https://lore.kernel.org/r/20230514130148.138624-2-prathubaronia2011%40gmail.com
patch subject: [PATCH v2 1/2] axis-fifo: use devm_kasprintf() for allocating formatted strings
config: i386-randconfig-m021
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Reported-by: Dan Carpenter <error27@xxxxxxxxx>
| Link: https://lore.kernel.org/r/202305150358.nt1BkbXz-lkp@xxxxxxxxx/

New smatch warnings:
drivers/staging/axis-fifo/axis-fifo.c:858 axis_fifo_probe() warn: missing unwind goto?

Old smatch warnings:
drivers/staging/axis-fifo/axis-fifo.c:907 axis_fifo_probe() error: '%pa' expects argument of type 'phys_addr_t*', argument 4 has type 'void**'

vim +858 drivers/staging/axis-fifo/axis-fifo.c

4a965c5f89decd Jacob Feder 2018-07-22 806 static int axis_fifo_probe(struct platform_device *pdev)
4a965c5f89decd Jacob Feder 2018-07-22 807 {
4a965c5f89decd Jacob Feder 2018-07-22 808 struct resource *r_mem; /* IO mem resources */
4a965c5f89decd Jacob Feder 2018-07-22 809 struct device *dev = &pdev->dev; /* OS device (from device tree) */
4a965c5f89decd Jacob Feder 2018-07-22 810 struct axis_fifo *fifo = NULL;
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 811 char *device_name;
4a965c5f89decd Jacob Feder 2018-07-22 812 int rc = 0; /* error return value */
4a965c5f89decd Jacob Feder 2018-07-22 813
4a965c5f89decd Jacob Feder 2018-07-22 814 /* ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 815 * init wrapper device
4a965c5f89decd Jacob Feder 2018-07-22 816 * ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 817 */
4a965c5f89decd Jacob Feder 2018-07-22 818
4a965c5f89decd Jacob Feder 2018-07-22 819 /* allocate device wrapper memory */
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 820 fifo = devm_kzalloc(dev, sizeof(*fifo), GFP_KERNEL);
4a965c5f89decd Jacob Feder 2018-07-22 821 if (!fifo)
4a965c5f89decd Jacob Feder 2018-07-22 822 return -ENOMEM;
4a965c5f89decd Jacob Feder 2018-07-22 823
4a965c5f89decd Jacob Feder 2018-07-22 824 dev_set_drvdata(dev, fifo);
4a965c5f89decd Jacob Feder 2018-07-22 825 fifo->dt_device = dev;
4a965c5f89decd Jacob Feder 2018-07-22 826
4a965c5f89decd Jacob Feder 2018-07-22 827 init_waitqueue_head(&fifo->read_queue);
4a965c5f89decd Jacob Feder 2018-07-22 828 init_waitqueue_head(&fifo->write_queue);
4a965c5f89decd Jacob Feder 2018-07-22 829
0443b3f4436321 Quentin Deslandes 2020-01-21 830 mutex_init(&fifo->read_lock);
0443b3f4436321 Quentin Deslandes 2020-01-21 831 mutex_init(&fifo->write_lock);
4a965c5f89decd Jacob Feder 2018-07-22 832
4a965c5f89decd Jacob Feder 2018-07-22 833 /* ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 834 * init device memory space
4a965c5f89decd Jacob Feder 2018-07-22 835 * ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 836 */
4a965c5f89decd Jacob Feder 2018-07-22 837
4a965c5f89decd Jacob Feder 2018-07-22 838 /* get iospace for the device */
4a965c5f89decd Jacob Feder 2018-07-22 839 r_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
4a965c5f89decd Jacob Feder 2018-07-22 840 if (!r_mem) {
4a965c5f89decd Jacob Feder 2018-07-22 841 dev_err(fifo->dt_device, "invalid address\n");
4a965c5f89decd Jacob Feder 2018-07-22 842 rc = -ENODEV;
4a965c5f89decd Jacob Feder 2018-07-22 843 goto err_initial;
4a965c5f89decd Jacob Feder 2018-07-22 844 }
4a965c5f89decd Jacob Feder 2018-07-22 845
4a965c5f89decd Jacob Feder 2018-07-22 846 /* request physical memory */
354e27a86b4c64 Quentin Deslandes 2019-11-01 847 fifo->base_addr = devm_ioremap_resource(fifo->dt_device, r_mem);
6a20d283ed6867 Quentin Deslandes 2019-11-01 848 if (IS_ERR(fifo->base_addr)) {
6a20d283ed6867 Quentin Deslandes 2019-11-01 849 rc = PTR_ERR(fifo->base_addr);
4a965c5f89decd Jacob Feder 2018-07-22 850 goto err_initial;
4a965c5f89decd Jacob Feder 2018-07-22 851 }
4a965c5f89decd Jacob Feder 2018-07-22 852
4a965c5f89decd Jacob Feder 2018-07-22 853 dev_dbg(fifo->dt_device, "remapped memory to 0x%p\n", fifo->base_addr);
4a965c5f89decd Jacob Feder 2018-07-22 854
4a965c5f89decd Jacob Feder 2018-07-22 855 /* create unique device name */
c5cab4f62648eb Prathu Baronia 2023-05-14 856 device_name = devm_kasprintf(dev, GFP_KERNEL, "%s_%pa", DRIVER_NAME, &r_mem->start);
c5cab4f62648eb Prathu Baronia 2023-05-14 857 if (!device_name)
c5cab4f62648eb Prathu Baronia 2023-05-14 @858 return -ENOMEM;

rc = -ENOMEM;
goto err_initial;

4a965c5f89decd Jacob Feder 2018-07-22 859 dev_dbg(fifo->dt_device, "device name [%s]\n", device_name);
4a965c5f89decd Jacob Feder 2018-07-22 860
4a965c5f89decd Jacob Feder 2018-07-22 861 /* ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 862 * init IP
4a965c5f89decd Jacob Feder 2018-07-22 863 * ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 864 */
4a965c5f89decd Jacob Feder 2018-07-22 865
ed6daf2b2832d9 Quentin Deslandes 2019-11-01 866 rc = axis_fifo_parse_dt(fifo);
4a965c5f89decd Jacob Feder 2018-07-22 867 if (rc)
6a20d283ed6867 Quentin Deslandes 2019-11-01 868 goto err_initial;
4a965c5f89decd Jacob Feder 2018-07-22 869
4a965c5f89decd Jacob Feder 2018-07-22 870 reset_ip_core(fifo);
4a965c5f89decd Jacob Feder 2018-07-22 871
4a965c5f89decd Jacob Feder 2018-07-22 872 /* ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 873 * init device interrupts
4a965c5f89decd Jacob Feder 2018-07-22 874 * ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 875 */
4a965c5f89decd Jacob Feder 2018-07-22 876
4a965c5f89decd Jacob Feder 2018-07-22 877 /* get IRQ resource */
790ada0e6ec33e Lad Prabhakar 2021-12-24 878 rc = platform_get_irq(pdev, 0);
790ada0e6ec33e Lad Prabhakar 2021-12-24 879 if (rc < 0)
6a20d283ed6867 Quentin Deslandes 2019-11-01 880 goto err_initial;
4a965c5f89decd Jacob Feder 2018-07-22 881
4a965c5f89decd Jacob Feder 2018-07-22 882 /* request IRQ */
790ada0e6ec33e Lad Prabhakar 2021-12-24 883 fifo->irq = rc;
6a20d283ed6867 Quentin Deslandes 2019-11-01 884 rc = devm_request_irq(fifo->dt_device, fifo->irq, &axis_fifo_irq, 0,
6a20d283ed6867 Quentin Deslandes 2019-11-01 885 DRIVER_NAME, fifo);
4a965c5f89decd Jacob Feder 2018-07-22 886 if (rc) {
4a965c5f89decd Jacob Feder 2018-07-22 887 dev_err(fifo->dt_device, "couldn't allocate interrupt %i\n",
4a965c5f89decd Jacob Feder 2018-07-22 888 fifo->irq);
6a20d283ed6867 Quentin Deslandes 2019-11-01 889 goto err_initial;
4a965c5f89decd Jacob Feder 2018-07-22 890 }
4a965c5f89decd Jacob Feder 2018-07-22 891
4a965c5f89decd Jacob Feder 2018-07-22 892 /* ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 893 * init char device
4a965c5f89decd Jacob Feder 2018-07-22 894 * ----------------------------
4a965c5f89decd Jacob Feder 2018-07-22 895 */
4a965c5f89decd Jacob Feder 2018-07-22 896
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 897 /* create character device */
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 898 fifo->miscdev.fops = &fops;
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 899 fifo->miscdev.minor = MISC_DYNAMIC_MINOR;
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 900 fifo->miscdev.name = device_name;
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 901 fifo->miscdev.groups = axis_fifo_attrs_groups;
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 902 fifo->miscdev.parent = dev;
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 903 rc = misc_register(&fifo->miscdev);
4a965c5f89decd Jacob Feder 2018-07-22 904 if (rc < 0)
6a20d283ed6867 Quentin Deslandes 2019-11-01 905 goto err_initial;
4a965c5f89decd Jacob Feder 2018-07-22 906
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 907 dev_info(fifo->dt_device, "axis-fifo created at %pa mapped to 0x%pa, irq=%i\n",
^^^^^
d2d7aa53891ea1 Greg Kroah-Hartman 2021-09-07 908 &r_mem->start, &fifo->base_addr, fifo->irq);
^^^^^^^^^^^^^^^^
I think Smatch is correct that it should just be %p instead of %pa but
I don't know the rules here too well.

4a965c5f89decd Jacob Feder 2018-07-22 909
4a965c5f89decd Jacob Feder 2018-07-22 910 return 0;
4a965c5f89decd Jacob Feder 2018-07-22 911
4a965c5f89decd Jacob Feder 2018-07-22 912 err_initial:
4a965c5f89decd Jacob Feder 2018-07-22 913 dev_set_drvdata(dev, NULL);
4a965c5f89decd Jacob Feder 2018-07-22 914 return rc;
4a965c5f89decd Jacob Feder 2018-07-22 915 }

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