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-rw-r--r--gfxnvidia.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/gfxnvidia.c b/gfxnvidia.c
index 8f3aa44..d3ee14e 100644
--- a/gfxnvidia.c
+++ b/gfxnvidia.c
@@ -90,6 +90,9 @@ int gfxnvidia_init(void)
return 1;
io_base_addr = pcidev_readbar(dev, PCI_BASE_ADDRESS_0);
+ if (!io_base_addr)
+ return 1;
+
io_base_addr += 0x300000;
msg_pinfo("Detected NVIDIA I/O base address: 0x%x.\n", io_base_addr);
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