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From: kernel test robot <lkp@intel.com>
To: kbuild@lists.01.org
Subject: kernel/irq/msi.c:555 msi_handle_pci_fail() warn: ignoring unreachable code.
Date: Wed, 09 Feb 2022 23:40:16 +0800	[thread overview]
Message-ID: <202202092336.cXjVyapN-lkp@intel.com> (raw)

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CC: kbuild-all(a)lists.01.org
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:   e6251ab4551f51fa4cee03523e08051898c3ce82
commit: 890337624e1fa2da079fc1c036a62d178c985280 genirq/msi: Handle PCI/MSI allocation fail in core code
date:   9 weeks ago
:::::: branch date: 19 hours ago
:::::: commit date: 9 weeks ago
config: arm-randconfig-m031-20220208 (https://download.01.org/0day-ci/archive/20220209/202202092336.cXjVyapN-lkp(a)intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0

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

da5dd9e854d2edd Thomas Gleixner 2017-12-29  540  
890337624e1fa2d Thomas Gleixner 2021-12-06  541  static int msi_handle_pci_fail(struct irq_domain *domain, struct msi_desc *desc,
890337624e1fa2d Thomas Gleixner 2021-12-06  542  			       int allocated)
890337624e1fa2d Thomas Gleixner 2021-12-06  543  {
890337624e1fa2d Thomas Gleixner 2021-12-06  544  	switch(domain->bus_token) {
890337624e1fa2d Thomas Gleixner 2021-12-06  545  	case DOMAIN_BUS_PCI_MSI:
890337624e1fa2d Thomas Gleixner 2021-12-06  546  	case DOMAIN_BUS_VMD_MSI:
890337624e1fa2d Thomas Gleixner 2021-12-06  547  		if (IS_ENABLED(CONFIG_PCI_MSI))
890337624e1fa2d Thomas Gleixner 2021-12-06  548  			break;
890337624e1fa2d Thomas Gleixner 2021-12-06  549  		fallthrough;
890337624e1fa2d Thomas Gleixner 2021-12-06  550  	default:
890337624e1fa2d Thomas Gleixner 2021-12-06  551  		return -ENOSPC;
890337624e1fa2d Thomas Gleixner 2021-12-06  552  	}
890337624e1fa2d Thomas Gleixner 2021-12-06  553  
890337624e1fa2d Thomas Gleixner 2021-12-06  554  	/* Let a failed PCI multi MSI allocation retry */
890337624e1fa2d Thomas Gleixner 2021-12-06 @555  	if (desc->nvec_used > 1)
890337624e1fa2d Thomas Gleixner 2021-12-06  556  		return 1;
890337624e1fa2d Thomas Gleixner 2021-12-06  557  
890337624e1fa2d Thomas Gleixner 2021-12-06  558  	/* If there was a successful allocation let the caller know */
890337624e1fa2d Thomas Gleixner 2021-12-06  559  	return allocated ? allocated : -ENOSPC;
890337624e1fa2d Thomas Gleixner 2021-12-06  560  }
890337624e1fa2d Thomas Gleixner 2021-12-06  561  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

             reply	other threads:[~2022-02-09 15:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-09 15:40 kernel test robot [this message]
2022-04-28  2:00 kernel/irq/msi.c:555 msi_handle_pci_fail() warn: ignoring unreachable code kernel test robot
2022-04-30 10:16 kernel test robot

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