patch-2.3.41 linux/arch/sparc64/kernel/pci_sabre.c

• Lines: 11
• Date: Thu Jan 27 08:58:15 2000
• Orig file: v2.3.40/linux/arch/sparc64/kernel/pci_sabre.c
• Orig date: Fri Jan 21 18:19:16 2000

diff -u --recursive --new-file v2.3.40/linux/arch/sparc64/kernel/pci_sabre.c linux/arch/sparc64/kernel/pci_sabre.c
@@ -1150,6 +1150,10 @@
 	p->iommu.page_table_map_base = dvma_offset;
 	memset((char *)tsbbase, 0, PAGE_SIZE << order);
 
+	/* Make sure DMA address 0 is never returned just to allow catching
+	   of buggy drivers.  */
+	p->iommu.lowest_free[0] = 1;
+
 #ifndef NEW_PCI_DMA_MAP
 	iopte = (iopte_t *)tsbbase;