Author: jhb
Date: Thu Sep 16 16:03:12 2010
New Revision: 212749
URL: http://svn.freebsd.org/changeset/base/212749
Log:
Only attempt to list extended capabilities for devices that have a
PCI-express capabilities. Non-PCI-express PCI devices may simply ignore
the upper bits in a config register address effectively aliasing the
device ID register to 0x100 rather than returning 0xFFFFFFFF. Previously
the code relied on these reads returning 0xFFFFFFFF.
MFC after: 3 days
Modified:
head/usr.sbin/pciconf/cap.c
Modified: head/usr.sbin/pciconf/cap.c
==============================================================================
--- head/usr.sbin/pciconf/cap.c Thu Sep 16 15:42:56 2010 (r212748)
+++ head/usr.sbin/pciconf/cap.c Thu Sep 16 16:03:12 2010 (r212749)
@@ -460,6 +460,7 @@ cap_pciaf(int fd, struct pci_conf *p, ui
void
list_caps(int fd, struct pci_conf *p)
{
+ int express;
uint16_t sta;
uint8_t ptr, cap;
@@ -481,6 +482,7 @@ list_caps(int fd, struct pci_conf *p)
}
/* Walk the capability list. */
+ express = 0;
ptr = read_config(fd, &p->pc_sel, ptr, 1);
while (ptr != 0 && ptr != 0xff) {
cap = read_config(fd, &p->pc_sel, ptr + PCICAP_ID, 1);
@@ -514,6 +516,7 @@ list_caps(int fd, struct pci_conf *p)
cap_subvendor(fd, p, ptr);
break;
case PCIY_EXPRESS:
+ express = 1;
cap_express(fd, p, ptr);
break;
case PCIY_MSIX:
@@ -533,7 +536,8 @@ list_caps(int fd, struct pci_conf *p)
ptr = read_config(fd, &p->pc_sel, ptr + PCICAP_NEXTPTR, 1);
}
- list_ecaps(fd, p);
+ if (express)
+ list_ecaps(fd, p);
}
/* From <sys/systm.h>. */
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