[vireshk:virtio/msg-amp 20/22] drivers/virtio/virtio_msg_amp_sapphire.c:147:28: sparse: sparse: dereference of noderef expression

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

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/linux.git virtio/msg-amp
head:   b382c54fa38099ef72901ecdd4e3edd3e3998d5a
commit: 9611632e8db76949a73dd21597ccefd2fafb1b49 [20/22] virtio: msg: Add Sapphire PCI transport driver for virtio-msg AMP
config: sparc64-randconfig-r123-20260408 (https://download.01.org/0day-ci/archive/20260408/202604081135.MWgsqagH-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project c80443cd37b2e2788cba67ffa180a6331e5f0791)
sparse: v0.6.5-rc1
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260408/202604081135.MWgsqagH-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
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604081135.MWgsqagH-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast to restricted __le16
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast from restricted __le32
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast to restricted __le16
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast from restricted __le32
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast to restricted __le16
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast from restricted __le32
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast to restricted __le16
>> drivers/virtio/virtio_msg_amp.c:299:55: sparse: sparse: cast from restricted __le32
--
>> drivers/virtio/virtio_msg_amp_sapphire.c:147:28: sparse: sparse: dereference of noderef expression
   drivers/virtio/virtio_msg_amp_sapphire.c:148:28: sparse: sparse: dereference of noderef expression
   drivers/virtio/virtio_msg_amp_sapphire.c:150:28: sparse: sparse: dereference of noderef expression

vim +147 drivers/virtio/virtio_msg_amp_sapphire.c

    59	
    60	static int vmamp_sap_probe(struct pci_dev *pdev, const struct pci_device_id *id)
    61	{
    62		struct vmamp_sap *vmamp_sap;
    63		resource_size_t	size;
    64		void __iomem * const *bar;
    65		phys_addr_t addr;
    66		int ret, i;
    67	
    68		vmamp_sap = devm_kzalloc(&pdev->dev, sizeof(struct vmamp_sap),
    69					 GFP_KERNEL);
    70		if (!vmamp_sap) {
    71			ret = -ENOMEM;
    72			goto error;
    73		}
    74	
    75		ret = pcim_enable_device(pdev);
    76		if (ret)
    77			goto error;
    78	
    79		ret = pcim_iomap_regions(pdev, BIT(0) | BIT(1), dev_name(&pdev->dev));
    80		if (ret)
    81			goto error;
    82	
    83		for (i = 0; i < 2; i++) {
    84			addr = pci_resource_start(pdev, i);
    85			size = pci_resource_len(pdev, i);
    86			dev_dbg(&pdev->dev, "msix (BAR%d) at %pa, size %pr\n", i, &addr,
    87				&size);
    88		}
    89	
    90		bar = pcim_iomap_table(pdev);
    91		if (!bar) {
    92			ret = -ENOMEM;
    93			goto error;
    94		}
    95	
    96		vmamp_sap->cfg_bram = bar[1];
    97		vmamp_sap->regs = (void __iomem *)((u8 __iomem *)bar[1] + 0x50000);
    98	
    99		/*
   100		 * Grab all vectors although we can only coalesce them into a single
   101		 * notifier. This avoids missing any event.
   102		 */
   103		vmamp_sap->vectors = pci_msix_vec_count(pdev);
   104		if (vmamp_sap->vectors < 0)
   105			vmamp_sap->vectors = 1;
   106	
   107		ret = pci_alloc_irq_vectors(pdev, vmamp_sap->vectors,
   108					    vmamp_sap->vectors,
   109					    PCI_IRQ_INTX | PCI_IRQ_MSIX);
   110		if (ret < 0)
   111			goto error;
   112	
   113		for (i = 0; i < vmamp_sap->vectors; i++) {
   114			ret = request_irq(pci_irq_vector(pdev, i), irq_handler,
   115					  IRQF_SHARED, dev_name(&pdev->dev), vmamp_sap);
   116			if (ret)
   117				goto free_irq;
   118		}
   119	
   120		vmamp_sap->vmamp.dev = &pdev->dev;
   121		vmamp_sap->vmamp.ops = &vmamp_sap_ops;
   122		pci_set_drvdata(pdev, vmamp_sap);
   123		pci_set_master(pdev);
   124	
   125		vmamp_sap->vmamp.shmem_size = 8 * 1024;
   126		vmamp_sap->vmamp.shmem = dma_alloc_coherent(&pdev->dev,
   127							    vmamp_sap->vmamp.shmem_size,
   128							    &vmamp_sap->shmem_dma,
   129							    GFP_KERNEL);
   130		if (!vmamp_sap->vmamp.shmem) {
   131			ret = -ENOMEM;
   132			goto clear_master;
   133		}
   134	
   135		memset(vmamp_sap->vmamp.shmem, 0, vmamp_sap->vmamp.shmem_size);
   136	
   137		hrtimer_setup(&vmamp_sap->poll, &poll_timer_expired, CLOCK_MONOTONIC,
   138			      HRTIMER_MODE_REL);
   139		// hrtimer_start(&vmamp_sap->poll, ms_to_ktime(50), HRTIMER_MODE_REL);
   140	
   141		ret = virtio_msg_amp_register(&vmamp_sap->vmamp);
   142		if (ret)
   143			goto free_shmem;
   144	
   145		// hrtimer_cancel(&vmamp_sap->poll);
   146	
 > 147		vmamp_sap->cfg_bram[0x4000 / 4 + 1] = vmamp_sap->shmem_dma;
   148		vmamp_sap->cfg_bram[0x4000 / 4 + 2] = vmamp_sap->shmem_dma >> 32;
   149		smp_wmb();
   150		vmamp_sap->cfg_bram[0x4000 / 4 + 0] = 1;
   151	
   152		return 0;
   153	
   154	free_shmem:
   155		dma_free_coherent(&pdev->dev, vmamp_sap->vmamp.shmem_size,
   156				  vmamp_sap->vmamp.shmem, vmamp_sap->shmem_dma);
   157	clear_master:
   158		pci_clear_master(pdev);
   159	free_irq:
   160		while (--i >= 0)
   161			free_irq(pci_irq_vector(pdev, i), vmamp_sap);
   162		pci_free_irq_vectors(pdev);
   163	
   164	error:
   165		dev_info(&pdev->dev, "probe failed: %d\n", ret);
   166		return ret;
   167	}
   168	

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