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path: root/drivers/gpu/vga/vgaarb.c
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Diffstat (limited to 'drivers/gpu/vga/vgaarb.c')
-rw-r--r--drivers/gpu/vga/vgaarb.c41
1 files changed, 17 insertions, 24 deletions
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index ea564711bb80..af0259708358 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -644,10 +644,12 @@ bail:
static inline void vga_update_device_decodes(struct vga_device *vgadev,
int new_decodes)
{
- int old_decodes;
- struct vga_device *new_vgadev, *conflict;
+ int old_decodes, decodes_removed, decodes_unlocked;
old_decodes = vgadev->decodes;
+ decodes_removed = ~new_decodes & old_decodes;
+ decodes_unlocked = vgadev->locks & decodes_removed;
+ vgadev->owns &= ~decodes_removed;
vgadev->decodes = new_decodes;
pr_info("vgaarb: device changed decodes: PCI:%s,olddecodes=%s,decodes=%s:owns=%s\n",
@@ -656,31 +658,22 @@ static inline void vga_update_device_decodes(struct vga_device *vgadev,
vga_iostate_to_str(vgadev->decodes),
vga_iostate_to_str(vgadev->owns));
-
- /* if we own the decodes we should move them along to
- another card */
- if ((vgadev->owns & old_decodes) && (vga_count > 1)) {
- /* set us to own nothing */
- vgadev->owns &= ~old_decodes;
- list_for_each_entry(new_vgadev, &vga_list, list) {
- if ((new_vgadev != vgadev) &&
- (new_vgadev->decodes & VGA_RSRC_LEGACY_MASK)) {
- pr_info("vgaarb: transferring owner from PCI:%s to PCI:%s\n", pci_name(vgadev->pdev), pci_name(new_vgadev->pdev));
- conflict = __vga_tryget(new_vgadev, VGA_RSRC_LEGACY_MASK);
- if (!conflict)
- __vga_put(new_vgadev, VGA_RSRC_LEGACY_MASK);
- break;
- }
- }
+ /* if we removed locked decodes, lock count goes to zero, and release */
+ if (decodes_unlocked) {
+ if (decodes_unlocked & VGA_RSRC_LEGACY_IO)
+ vgadev->io_lock_cnt = 0;
+ if (decodes_unlocked & VGA_RSRC_LEGACY_MEM)
+ vgadev->mem_lock_cnt = 0;
+ __vga_put(vgadev, decodes_unlocked);
}
/* change decodes counter */
- if (old_decodes != new_decodes) {
- if (new_decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM))
- vga_decode_count++;
- else
- vga_decode_count--;
- }
+ if (old_decodes & VGA_RSRC_LEGACY_MASK &&
+ !(new_decodes & VGA_RSRC_LEGACY_MASK))
+ vga_decode_count--;
+ if (!(old_decodes & VGA_RSRC_LEGACY_MASK) &&
+ new_decodes & VGA_RSRC_LEGACY_MASK)
+ vga_decode_count++;
pr_debug("vgaarb: decoding count now is: %d\n", vga_decode_count);
}