drivers/irqchip/irq-apple-aic.c:941 aic_of_ic_init() error: uninitialized symbol 'off'.

From: Dan Carpenter
Date: Mon Dec 04 2023 - 01:41:58 EST

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 33cc938e65a98f1d29d0a18403dbbee050dcad9a
commit: dc97fd6fec009957e81026055fc99a03877ff3b8 irqchip/apple-aic: Dynamically compute register offsets
config: arm64-randconfig-r081-20231127 (https://download.01.org/0day-ci/archive/20231203/202312032327.J915WcaL-lkp@xxxxxxxxx/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project.git f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce: (https://download.01.org/0day-ci/archive/20231203/202312032327.J915WcaL-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
| Closes: https://lore.kernel.org/r/202312032327.J915WcaL-lkp@xxxxxxxxx/

New smatch warnings:
drivers/irqchip/irq-apple-aic.c:941 aic_of_ic_init() error: uninitialized symbol 'off'.

Old smatch warnings:
drivers/irqchip/irq-apple-aic.c:920 aic_of_ic_init() warn: possible memory leak of 'irqc'
drivers/irqchip/irq-apple-aic.c:998 aic_of_ic_init() warn: 'regs' from of_iomap() not released on lines: 914,920.

vim +/off +941 drivers/irqchip/irq-apple-aic.c

76cde26394114f Hector Martin 2021-01-21 900 static int __init aic_of_ic_init(struct device_node *node, struct device_node *parent)
76cde26394114f Hector Martin 2021-01-21 901 {
76cde26394114f Hector Martin 2021-01-21 902 int i;
dc97fd6fec0099 Hector Martin 2022-03-10 903 u32 off;
76cde26394114f Hector Martin 2021-01-21 904 void __iomem *regs;
76cde26394114f Hector Martin 2021-01-21 905 struct aic_irq_chip *irqc;
2cf68211664acd Hector Martin 2022-03-10 906 const struct of_device_id *match;
76cde26394114f Hector Martin 2021-01-21 907
76cde26394114f Hector Martin 2021-01-21 908 regs = of_iomap(node, 0);
76cde26394114f Hector Martin 2021-01-21 909 if (WARN_ON(!regs))
76cde26394114f Hector Martin 2021-01-21 910 return -EIO;
76cde26394114f Hector Martin 2021-01-21 911
76cde26394114f Hector Martin 2021-01-21 912 irqc = kzalloc(sizeof(*irqc), GFP_KERNEL);
76cde26394114f Hector Martin 2021-01-21 913 if (!irqc)
76cde26394114f Hector Martin 2021-01-21 914 return -ENOMEM;
76cde26394114f Hector Martin 2021-01-21 915
76cde26394114f Hector Martin 2021-01-21 916 irqc->base = regs;
76cde26394114f Hector Martin 2021-01-21 917
2cf68211664acd Hector Martin 2022-03-10 918 match = of_match_node(aic_info_match, node);
2cf68211664acd Hector Martin 2022-03-10 919 if (!match)
2cf68211664acd Hector Martin 2022-03-10 920 return -ENODEV;
2cf68211664acd Hector Martin 2022-03-10 921
2cf68211664acd Hector Martin 2022-03-10 922 irqc->info = *(struct aic_info *)match->data;
2cf68211664acd Hector Martin 2022-03-10 923
2cf68211664acd Hector Martin 2022-03-10 924 aic_irqc = irqc;
2cf68211664acd Hector Martin 2022-03-10 925
dc97fd6fec0099 Hector Martin 2022-03-10 926 switch (irqc->info.version) {
dc97fd6fec0099 Hector Martin 2022-03-10 927 case 1: {
dc97fd6fec0099 Hector Martin 2022-03-10 928 u32 info;
dc97fd6fec0099 Hector Martin 2022-03-10 929
76cde26394114f Hector Martin 2021-01-21 930 info = aic_ic_read(irqc, AIC_INFO);
7c841f5f6fa3f9 Hector Martin 2022-03-10 931 irqc->nr_irq = FIELD_GET(AIC_INFO_NR_IRQ, info);
dc97fd6fec0099 Hector Martin 2022-03-10 932 irqc->max_irq = AIC_MAX_IRQ;
dc97fd6fec0099 Hector Martin 2022-03-10 933
dc97fd6fec0099 Hector Martin 2022-03-10 934 off = irqc->info.target_cpu;
dc97fd6fec0099 Hector Martin 2022-03-10 935 off += sizeof(u32) * irqc->max_irq; /* TARGET_CPU */
dc97fd6fec0099 Hector Martin 2022-03-10 936
dc97fd6fec0099 Hector Martin 2022-03-10 937 break;
dc97fd6fec0099 Hector Martin 2022-03-10 938 }

not default statement.

dc97fd6fec0099 Hector Martin 2022-03-10 939 }
dc97fd6fec0099 Hector Martin 2022-03-10 940
dc97fd6fec0099 Hector Martin 2022-03-10 @941 irqc->info.sw_set = off;
dc97fd6fec0099 Hector Martin 2022-03-10 942 off += sizeof(u32) * (irqc->max_irq >> 5); /* SW_SET */
dc97fd6fec0099 Hector Martin 2022-03-10 943 irqc->info.sw_clr = off;
dc97fd6fec0099 Hector Martin 2022-03-10 944 off += sizeof(u32) * (irqc->max_irq >> 5); /* SW_CLR */
dc97fd6fec0099 Hector Martin 2022-03-10 945 irqc->info.mask_set = off;
dc97fd6fec0099 Hector Martin 2022-03-10 946 off += sizeof(u32) * (irqc->max_irq >> 5); /* MASK_SET */
dc97fd6fec0099 Hector Martin 2022-03-10 947 irqc->info.mask_clr = off;
dc97fd6fec0099 Hector Martin 2022-03-10 948 off += sizeof(u32) * (irqc->max_irq >> 5); /* MASK_CLR */
dc97fd6fec0099 Hector Martin 2022-03-10 949 off += sizeof(u32) * (irqc->max_irq >> 5); /* HW_STATE */
76cde26394114f Hector Martin 2021-01-21 950
2cf68211664acd Hector Martin 2022-03-10 951 if (irqc->info.fast_ipi)
2cf68211664acd Hector Martin 2022-03-10 952 static_branch_enable(&use_fast_ipi);
2cf68211664acd Hector Martin 2022-03-10 953 else
2cf68211664acd Hector Martin 2022-03-10 954 static_branch_disable(&use_fast_ipi);
2cf68211664acd Hector Martin 2022-03-10 955
7c841f5f6fa3f9 Hector Martin 2022-03-10 956 irqc->hw_domain = irq_domain_create_tree(of_node_to_fwnode(node),
76cde26394114f Hector Martin 2021-01-21 957 &aic_irq_domain_ops, irqc);
76cde26394114f Hector Martin 2021-01-21 958 if (WARN_ON(!irqc->hw_domain)) {
76cde26394114f Hector Martin 2021-01-21 959 iounmap(irqc->base);
76cde26394114f Hector Martin 2021-01-21 960 kfree(irqc);
76cde26394114f Hector Martin 2021-01-21 961 return -ENODEV;
76cde26394114f Hector Martin 2021-01-21 962 }
76cde26394114f Hector Martin 2021-01-21 963
76cde26394114f Hector Martin 2021-01-21 964 irq_domain_update_bus_token(irqc->hw_domain, DOMAIN_BUS_WIRED);
76cde26394114f Hector Martin 2021-01-21 965
76cde26394114f Hector Martin 2021-01-21 966 if (aic_init_smp(irqc, node)) {
76cde26394114f Hector Martin 2021-01-21 967 irq_domain_remove(irqc->hw_domain);
76cde26394114f Hector Martin 2021-01-21 968 iounmap(irqc->base);
76cde26394114f Hector Martin 2021-01-21 969 kfree(irqc);
76cde26394114f Hector Martin 2021-01-21 970 return -ENODEV;
76cde26394114f Hector Martin 2021-01-21 971 }
76cde26394114f Hector Martin 2021-01-21 972
76cde26394114f Hector Martin 2021-01-21 973 set_handle_irq(aic_handle_irq);
76cde26394114f Hector Martin 2021-01-21 974 set_handle_fiq(aic_handle_fiq);
76cde26394114f Hector Martin 2021-01-21 975
7c841f5f6fa3f9 Hector Martin 2022-03-10 976 for (i = 0; i < BITS_TO_U32(irqc->nr_irq); i++)
dc97fd6fec0099 Hector Martin 2022-03-10 977 aic_ic_write(irqc, irqc->info.mask_set + i * 4, U32_MAX);
7c841f5f6fa3f9 Hector Martin 2022-03-10 978 for (i = 0; i < BITS_TO_U32(irqc->nr_irq); i++)
dc97fd6fec0099 Hector Martin 2022-03-10 979 aic_ic_write(irqc, irqc->info.sw_clr + i * 4, U32_MAX);
7c841f5f6fa3f9 Hector Martin 2022-03-10 980 for (i = 0; i < irqc->nr_irq; i++)
dc97fd6fec0099 Hector Martin 2022-03-10 981 aic_ic_write(irqc, irqc->info.target_cpu + i * 4, 1);
76cde26394114f Hector Martin 2021-01-21 982
76cde26394114f Hector Martin 2021-01-21 983 if (!is_kernel_in_hyp_mode())
76cde26394114f Hector Martin 2021-01-21 984 pr_info("Kernel running in EL1, mapping interrupts");
76cde26394114f Hector Martin 2021-01-21 985
2cf68211664acd Hector Martin 2022-03-10 986 if (static_branch_likely(&use_fast_ipi))
2cf68211664acd Hector Martin 2022-03-10 987 pr_info("Using Fast IPIs");
2cf68211664acd Hector Martin 2022-03-10 988
76cde26394114f Hector Martin 2021-01-21 989 cpuhp_setup_state(CPUHP_AP_IRQ_APPLE_AIC_STARTING,
76cde26394114f Hector Martin 2021-01-21 990 "irqchip/apple-aic/ipi:starting",
76cde26394114f Hector Martin 2021-01-21 991 aic_init_cpu, NULL);
76cde26394114f Hector Martin 2021-01-21 992
b6ca556c352979 Marc Zyngier 2021-02-28 993 vgic_set_kvm_info(&vgic_info);
b6ca556c352979 Marc Zyngier 2021-02-28 994
dc97fd6fec0099 Hector Martin 2022-03-10 995 pr_info("Initialized with %d/%d IRQs, %d FIQs, %d vIPIs",
dc97fd6fec0099 Hector Martin 2022-03-10 996 irqc->nr_irq, irqc->max_irq, AIC_NR_FIQ, AIC_NR_SWIPI);
76cde26394114f Hector Martin 2021-01-21 997
76cde26394114f Hector Martin 2021-01-21 998 return 0;
76cde26394114f Hector Martin 2021-01-21 999 }

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