1 files changed, 65 insertions, 35 deletions

diff --git a/drivers/pnp/quirks.c b/drivers/pnp/quirks.c
index 4065139753b6..37993206ae5d 100644
--- a/drivers/pnp/quirks.c
+++ b/drivers/pnp/quirks.c
@@ -17,7 +17,6 @@
 #include <linux/slab.h>
 #include <linux/pnp.h>
 #include <linux/io.h>
-#include <linux/dmi.h>
 #include <linux/kallsyms.h>
 #include "base.h"
 
@@ -109,42 +108,73 @@ static void quirk_sb16audio_resources(struct pnp_dev *dev)
                        "pnp: SB audio device quirk - increasing port range\n");
 }
 
-static void quirk_supermicro_h8dce_system(struct pnp_dev *dev)
+
+#include <linux/pci.h>
+
+static void quirk_system_pci_resources(struct pnp_dev *dev)
 {
-        int i;
-        static struct dmi_system_id supermicro_h8dce[] = {
-                {
-                        .ident = "Supermicro H8DCE",
-                        .matches = {
-                                DMI_MATCH(DMI_SYS_VENDOR, "Supermicro"),
-                                DMI_MATCH(DMI_PRODUCT_NAME, "H8DCE"),
-                        },
-                },
-                { }
-        };
-
-        if (!dmi_check_system(supermicro_h8dce))
-                return;
+        struct pci_dev *pdev = NULL;
+        resource_size_t pnp_start, pnp_end, pci_start, pci_end;
+        int i, j;
 
         /*
-         * On the Supermicro H8DCE, there's a system device with resources
-         * that overlap BAR 6 of the built-in SATA PCI adapter.  If the PNP
-         * system device claims them, the sata_nv driver won't be able to.
-         * More details at:
-         *     https://bugzilla.redhat.com/show_bug.cgi?id=280641
-         *     https://bugzilla.redhat.com/show_bug.cgi?id=313491
-         *     http://lkml.org/lkml/2008/1/9/449
-         *     http://thread.gmane.org/gmane.linux.acpi.devel/27312
+         * Some BIOSes have PNP motherboard devices with resources that
+         * partially overlap PCI BARs.  The PNP system driver claims these
+         * motherboard resources, which prevents the normal PCI driver from
+         * requesting them later.
+         *
+         * This patch disables the PNP resources that conflict with PCI BARs
+         * so they won't be claimed by the PNP system driver.
          */
-        for (i = 0; i < PNP_MAX_MEM; i++) {
-                if (pnp_mem_valid(dev, i) && pnp_mem_len(dev, i) &&
-                    (pnp_mem_start(dev, i) & 0xdfef0000) == 0xdfef0000) {
-                        dev_warn(&dev->dev, "disabling 0x%llx-0x%llx to prevent"
-                                " conflict with sata_nv PCI device\n",
-                                (unsigned long long) pnp_mem_start(dev, i),
-                                (unsigned long long) (pnp_mem_start(dev, i) +
-                                        pnp_mem_len(dev, i) - 1));
-                        pnp_mem_flags(dev, i) = 0;
+        for_each_pci_dev(pdev) {
+                for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+                        if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM) ||
+                            pci_resource_len(pdev, i) == 0)
+                                continue;
+
+                        pci_start = pci_resource_start(pdev, i);
+                        pci_end = pci_resource_end(pdev, i);
+                        for (j = 0; j < PNP_MAX_MEM; j++) {
+                                if (!pnp_mem_valid(dev, j) ||
+                                    pnp_mem_len(dev, j) == 0)
+                                        continue;
+
+                                pnp_start = pnp_mem_start(dev, j);
+                                pnp_end = pnp_mem_end(dev, j);
+
+                                /*
+                                 * If the PNP region doesn't overlap the PCI
+                                 * region at all, there's no problem.
+                                 */
+                                if (pnp_end < pci_start || pnp_start > pci_end)
+                                        continue;
+
+                                /*
+                                 * If the PNP region completely encloses (or is
+                                 * at least as large as) the PCI region, that's
+                                 * also OK.  For example, this happens when the
+                                 * PNP device describes a bridge with PCI
+                                 * behind it.
+                                 */
+                                if (pnp_start <= pci_start &&
+                                    pnp_end >= pci_end)
+                                        continue;
+
+                                /*
+                                 * Otherwise, the PNP region overlaps *part* of
+                                 * the PCI region, and that might prevent a PCI
+                                 * driver from requesting its resources.
+                                 */
+                                dev_warn(&dev->dev, "mem resource "
+                                        "(0x%llx-0x%llx) overlaps %s BAR %d "
+                                        "(0x%llx-0x%llx), disabling\n",
+                                        (unsigned long long) pnp_start,
+                                        (unsigned long long) pnp_end,
+                                        pci_name(pdev), i,
+                                        (unsigned long long) pci_start,
+                                        (unsigned long long) pci_end);
+                                pnp_mem_flags(dev, j) = 0;
+                        }
                 }
         }
 }
@@ -169,8 +199,8 @@ static struct pnp_fixup pnp_fixups[] = {
         {"CTL0043", quirk_sb16audio_resources},
         {"CTL0044", quirk_sb16audio_resources},
         {"CTL0045", quirk_sb16audio_resources},
-        {"PNP0c01", quirk_supermicro_h8dce_system},
-        {"PNP0c02", quirk_supermicro_h8dce_system},
+        {"PNP0c01", quirk_system_pci_resources},
+        {"PNP0c02", quirk_system_pci_resources},
         {""}
 };