Date:   Sat, 11 Mar 2023 16:54:32 +0300
From:   Dan Carpenter <error27@gmail.com>
To:     oe-kbuild@lists.linux.dev,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        =?iso-8859-1?Q?Micka=EBl_Sala=FCn?= <mic@digikod.net>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Randy Dunlap <rdunlap@infradead.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Bjorn Helgaas <helgaas@kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Niklas Schnelle <schnelle@linux.ibm.com>,
        Pali =?iso-8859-1?Q?Roh=E1r?= <pali@kernel.org>,
        "Maciej W. Rozycki" <macro@orcam.me.uk>,
        Juergen Gross <jgross@suse.com>,
        Dominik Brodowski <linux@dominikbrodowski.net>,
        linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org,
        sparclinux@vger.kernel.org, linux-pci@vger.kernel.org,
        xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org
Cc:     lkp@intel.com, oe-kbuild-all@lists.linux.dev,
        Miguel Ojeda <ojeda@kernel.org>,
        Richard Henderson <richard.henderson@linaro.org>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Matt Turner <mattst88@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Andrew Lunn <andrew@lunn.ch>
Subject: Re: [PATCH v4 1/4] PCI: Introduce pci_dev_for_each_resource()
Message-ID: <d057ac5c-5947-41e1-abc7-9428fbd2fbe2@kili.mountain>
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In-Reply-To: <20230310171416.23356-2-andriy.shevchenko@linux.intel.com>
Precedence: bulk

Hi Andy,

https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Andy-Shevchenko/PCI-Introduce-pci_dev_for_each_resource/20230311-011642
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git next
patch link:    https://lore.kernel.org/r/20230310171416.23356-2-andriy.shevchenko%40linux.intel.com
patch subject: [PATCH v4 1/4] PCI: Introduce pci_dev_for_each_resource()
config: x86_64-randconfig-m001 (https://download.01.org/0day-ci/archive/20230311/202303112149.xD47qKOY-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Link: https://lore.kernel.org/r/202303112149.xD47qKOY-lkp@intel.com/

smatch warnings:
drivers/pnp/quirks.c:248 quirk_system_pci_resources() warn: was && intended here instead of ||?

vim +248 drivers/pnp/quirks.c

0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  229  static void quirk_system_pci_resources(struct pnp_dev *dev)
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  230  {
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  231  	struct pci_dev *pdev = NULL;
059b4a086017fb Mika Westerberg 2023-03-10  232  	struct resource *res, *r;
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  233  	int i, j;
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  234  
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  235  	/*
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  236  	 * Some BIOSes have PNP motherboard devices with resources that
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  237  	 * partially overlap PCI BARs.  The PNP system driver claims these
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  238  	 * motherboard resources, which prevents the normal PCI driver from
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  239  	 * requesting them later.
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  240  	 *
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  241  	 * This patch disables the PNP resources that conflict with PCI BARs
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  242  	 * so they won't be claimed by the PNP system driver.
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  243  	 */
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  244  	for_each_pci_dev(pdev) {
059b4a086017fb Mika Westerberg 2023-03-10  245  		pci_dev_for_each_resource(pdev, r, i) {
059b4a086017fb Mika Westerberg 2023-03-10  246  			unsigned long type = resource_type(r);
999ed65ad12e37 Rene Herman     2008-07-25  247  
059b4a086017fb Mika Westerberg 2023-03-10 @248  			if (type != IORESOURCE_IO || type != IORESOURCE_MEM ||
                                                                                                  ^^
This || needs to be &&.  This loop will always hit the continue path
without doing anything.

059b4a086017fb Mika Westerberg 2023-03-10  249  			    resource_size(r) == 0)
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  250  				continue;
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  251  
059b4a086017fb Mika Westerberg 2023-03-10  252  			if (r->flags & IORESOURCE_UNSET)
f7834c092c4299 Bjorn Helgaas   2015-03-03  253  				continue;
f7834c092c4299 Bjorn Helgaas   2015-03-03  254  
95ab3669f78306 Bjorn Helgaas   2008-04-28  255  			for (j = 0;
999ed65ad12e37 Rene Herman     2008-07-25  256  			     (res = pnp_get_resource(dev, type, j)); j++) {
aee3ad815dd291 Bjorn Helgaas   2008-06-27  257  				if (res->start == 0 && res->end == 0)
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  258  					continue;
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  259  
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  260  				/*
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  261  				 * If the PNP region doesn't overlap the PCI
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  262  				 * region at all, there's no problem.
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  263  				 */
059b4a086017fb Mika Westerberg 2023-03-10  264  				if (!resource_overlaps(res, r))
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  265  					continue;
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  266  
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  267  				/*
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  268  				 * If the PNP region completely encloses (or is
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  269  				 * at least as large as) the PCI region, that's
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  270  				 * also OK.  For example, this happens when the
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  271  				 * PNP device describes a bridge with PCI
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  272  				 * behind it.
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  273  				 */
059b4a086017fb Mika Westerberg 2023-03-10  274  				if (res->start <= r->start && res->end >= r->end)
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  275  					continue;
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  276  
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  277  				/*
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  278  				 * Otherwise, the PNP region overlaps *part* of
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  279  				 * the PCI region, and that might prevent a PCI
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  280  				 * driver from requesting its resources.
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  281  				 */
c7dabef8a2c59e Bjorn Helgaas   2009-10-27  282  				dev_warn(&dev->dev,
059b4a086017fb Mika Westerberg 2023-03-10  283  					 "disabling %pR because it overlaps %s BAR %d %pR\n",
059b4a086017fb Mika Westerberg 2023-03-10  284  					 res, pci_name(pdev), i, r);
4b34fe156455d2 Bjorn Helgaas   2008-06-02  285  				res->flags |= IORESOURCE_DISABLED;
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  286  			}
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  287  		}
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  288  	}
0509ad5e1a7d92 Bjorn Helgaas   2008-03-11  289  }

-- 
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