linux-kernel - drivers/irqchip/irq-sun6i-r.c:215:79: sparse: sparse: Using plain integer as NULL pointer

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Message-ID: <202203130814.1YMJ3vAC-lkp@intel.com>
Date:   Sun, 13 Mar 2022 08:49:16 +0800
From:   kernel test robot <lkp@...el.com>
To:     Samuel Holland <samuel@...lland.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Marc Zyngier <maz@...nel.org>
Subject: drivers/irqchip/irq-sun6i-r.c:215:79: sparse: sparse: Using plain
 integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   68453767131a5deec1e8f9ac92a9042f929e585d
commit: 4e34614636b31747b190488240a95647c227021f irqchip/sun6i-r: Use a stacked irqchip driver
date:   1 year, 2 months ago
config: arm64-allmodconfig (https://download.01.org/0day-ci/archive/20220313/202203130814.1YMJ3vAC-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4e34614636b31747b190488240a95647c227021f
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 4e34614636b31747b190488240a95647c227021f
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash drivers/gpu/drm/tegra/ drivers/gpu/host1x/ drivers/hid/ drivers/irqchip/ drivers/remoteproc/ drivers/scsi/hisi_sas/ security/integrity/ima/

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


sparse warnings: (new ones prefixed by >>)
>> drivers/irqchip/irq-sun6i-r.c:215:79: sparse: sparse: Using plain integer as NULL pointer

vim +215 drivers/irqchip/irq-sun6i-r.c

   184	
   185	static int sun6i_r_intc_domain_alloc(struct irq_domain *domain,
   186					     unsigned int virq,
   187					     unsigned int nr_irqs, void *arg)
   188	{
   189		struct irq_fwspec *fwspec = arg;
   190		struct irq_fwspec gic_fwspec;
   191		unsigned long hwirq;
   192		unsigned int type;
   193		int i, ret;
   194	
   195		ret = sun6i_r_intc_domain_translate(domain, fwspec, &hwirq, &type);
   196		if (ret)
   197			return ret;
   198		if (hwirq + nr_irqs > SUN6I_NR_MUX_BITS)
   199			return -EINVAL;
   200	
   201		/* Construct a GIC-compatible fwspec from this fwspec. */
   202		gic_fwspec = (struct irq_fwspec) {
   203			.fwnode      = domain->parent->fwnode,
   204			.param_count = 3,
   205			.param       = { GIC_SPI, hwirq, type },
   206		};
   207	
   208		ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, &gic_fwspec);
   209		if (ret)
   210			return ret;
   211	
   212		for (i = 0; i < nr_irqs; ++i, ++hwirq, ++virq) {
   213			if (hwirq == nmi_hwirq) {
   214				irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
 > 215							      &sun6i_r_intc_nmi_chip, 0);
   216				irq_set_handler(virq, handle_fasteoi_ack_irq);
   217			} else {
   218				/* Only the NMI is currently supported. */
   219				return -EINVAL;
   220			}
   221		}
   222	
   223		return 0;
   224	}
   225	

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