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-rw-r--r--arch/x86_64/kernel/pci-calgary.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/arch/x86_64/kernel/pci-calgary.c b/arch/x86_64/kernel/pci-calgary.c
index 3215675ab128..87d90cb68a74 100644
--- a/arch/x86_64/kernel/pci-calgary.c
+++ b/arch/x86_64/kernel/pci-calgary.c
@@ -1052,7 +1052,7 @@ void __init detect_calgary(void)
void *tbl;
int calgary_found = 0;
unsigned long ptr;
- int offset;
+ unsigned int offset, prev_offset;
int ret;
/*
@@ -1071,15 +1071,20 @@ void __init detect_calgary(void)
ptr = (unsigned long)phys_to_virt(get_bios_ebda());
rio_table_hdr = NULL;
+ prev_offset = 0;
offset = 0x180;
- while (offset) {
+ /*
+ * The next offset is stored in the 1st word.
+ * Only parse up until the offset increases:
+ */
+ while (offset > prev_offset) {
/* The block id is stored in the 2nd word */
if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
/* set the pointer past the offset & block id */
rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
break;
}
- /* The next offset is stored in the 1st word. 0 means no more */
+ prev_offset = offset;
offset = *((unsigned short *)(ptr + offset));
}
if (!rio_table_hdr) {