CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
CC: linux-kernel(a)vger.kernel.org
TO: Thomas Gleixner <tglx@linutronix.de>
CC: Jason Gunthorpe <jgg@nvidia.com>
CC: "Greg Kroah-Hartman" <gregkh@linuxfoundation.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   8013d1d3d2e33236dee13a133fba49ad55045e79
commit: 890337624e1fa2da079fc1c036a62d178c985280 genirq/msi: Handle PCI/MSI allocation fail in core code
date:   5 months ago
:::::: branch date: 11 hours ago
:::::: commit date: 5 months ago
config: arm64-randconfig-m031-20220427 (https://download.01.org/0day-ci/archive/20220430/202204301857.7soRGY44-lkp(a)intel.com/config)
compiler: aarch64-linux-gcc (GCC) 11.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
kernel/irq/msi.c:555 msi_handle_pci_fail() warn: ignoring unreachable code.

vim +555 kernel/irq/msi.c

da5dd9e854d2ed Thomas Gleixner 2017-12-29  540  
890337624e1fa2 Thomas Gleixner 2021-12-06  541  static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc,
890337624e1fa2 Thomas Gleixner 2021-12-06  542  			       int allocated)
890337624e1fa2 Thomas Gleixner 2021-12-06  543  {
890337624e1fa2 Thomas Gleixner 2021-12-06  544  	switch(domain->bus_token) {
890337624e1fa2 Thomas Gleixner 2021-12-06  545  	case DOMAIN_BUS_PCI_MSI:
890337624e1fa2 Thomas Gleixner 2021-12-06  546  	case DOMAIN_BUS_VMD_MSI:
890337624e1fa2 Thomas Gleixner 2021-12-06  547  		if (IS_ENABLED(CONFIG_PCI_MSI))
890337624e1fa2 Thomas Gleixner 2021-12-06  548  			break;
890337624e1fa2 Thomas Gleixner 2021-12-06  549  		fallthrough;
890337624e1fa2 Thomas Gleixner 2021-12-06  550  	default:
890337624e1fa2 Thomas Gleixner 2021-12-06  551  		return -ENOSPC;
890337624e1fa2 Thomas Gleixner 2021-12-06  552  	}
890337624e1fa2 Thomas Gleixner 2021-12-06  553  
890337624e1fa2 Thomas Gleixner 2021-12-06  554  	/* Let a failed PCI multi MSI allocation retry */
890337624e1fa2 Thomas Gleixner 2021-12-06 @555  	if (desc->nvec_used > 1)
890337624e1fa2 Thomas Gleixner 2021-12-06  556  		return 1;
890337624e1fa2 Thomas Gleixner 2021-12-06  557  
890337624e1fa2 Thomas Gleixner 2021-12-06  558  	/* If there was a successful allocation let the caller know */
890337624e1fa2 Thomas Gleixner 2021-12-06  559  	return allocated ? allocated : -ENOSPC;
890337624e1fa2 Thomas Gleixner 2021-12-06  560  }
890337624e1fa2 Thomas Gleixner 2021-12-06  561  

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