vgaarb: Fix VGA arbiter to accept PCI domains other than 0

Update the VGA Arbiter to accept PCI Domains other than 0.

Signed-off-by: Mike Travis <travis@sgi.com>
LKML-Reference: <201002022238.o12McFe8018730@imap1.linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Robin Holt <holt@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 1ac0c93603c903a1d7a39f1efb10530936a2f4e1..ba7fa9ee54dc00a58e26d74fa79433993271854b 100644 (file)
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -954,6 +954,7 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
                }
 
        } else if (strncmp(curr_pos, "target ", 7) == 0) {
+               struct pci_bus *pbus;
                unsigned int domain, bus, devfn;
                struct vga_device *vgadev;
 
@@ -969,18 +970,31 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
                                ret_val = -EPROTO;
                                goto done;
                        }
-
-                       pdev = pci_get_bus_and_slot(bus, devfn);
+                       pr_devel("vgaarb: %s ==> %x:%x:%x.%x\n", curr_pos,
+                               domain, bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
+
+                       pbus = pci_find_bus(domain, bus);
+                       pr_devel("vgaarb: pbus %p\n", pbus);
+                       if (pbus == NULL) {
+                               pr_err("vgaarb: invalid PCI domain and/or bus address %x:%x\n",
+                                       domain, bus);
+                               ret_val = -ENODEV;
+                               goto done;
+                       }
+                       pdev = pci_get_slot(pbus, devfn);
+                       pr_devel("vgaarb: pdev %p\n", pdev);
                        if (!pdev) {
-                               pr_info("vgaarb: invalid PCI address!\n");
+                               pr_err("vgaarb: invalid PCI address %x:%x\n",
+                                       bus, devfn);
                                ret_val = -ENODEV;
                                goto done;
                        }
                }
 
                vgadev = vgadev_find(pdev);
+               pr_devel("vgaarb: vgadev %p\n", vgadev);
                if (vgadev == NULL) {
-                       pr_info("vgaarb: this pci device is not a vga device\n");
+                       pr_err("vgaarb: this pci device is not a vga device\n");
                        pci_dev_put(pdev);
                        ret_val = -ENODEV;
                        goto done;
@@ -998,7 +1012,8 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
                        }
                }
                if (i == MAX_USER_CARDS) {
-                       pr_err("vgaarb: maximum user cards number reached!\n");
+                       pr_err("vgaarb: maximum user cards (%d) number reached!\n",
+                               MAX_USER_CARDS);
                        pci_dev_put(pdev);
                        /* XXX: which value to return? */
                        ret_val =  -ENOMEM;