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-rw-r--r--drivers/pcmcia/rsrc_nonstatic.c35
1 files changed, 29 insertions, 6 deletions
diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index ba5256d..dcd1a4a 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -935,23 +935,42 @@ static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
return -ENODEV;
#if defined(CONFIG_X86)
- /* If this is the root bus, the risk of hitting
- * some strange system devices which aren't protected
- * by either ACPI resource tables or properly requested
- * resources is too big. Therefore, don't do auto-adding
- * of resources at the moment.
+ /* If this is the root bus, the risk of hitting some strange
+ * system devices is too high: If a driver isn't loaded, the
+ * resources are not claimed; even if a driver is loaded, it
+ * may not request all resources or even the wrong one. We
+ * can neither trust the rest of the kernel nor ACPI/PNP and
+ * CRS parsing to get it right. Therefore, use several
+ * safeguards:
+ *
+ * - Do not auto-add resources if the CardBus bridge is on
+ * the PCI root bus
+ *
+ * - Avoid any I/O ports < 0x100.
+ *
+ * - On PCI-PCI bridges, only use resources which are set up
+ * exclusively for the secondary PCI bus: the risk of hitting
+ * system devices is quite low, as they usually aren't
+ * connected to the secondary PCI bus.
*/
if (s->cb_dev->bus->number == 0)
return -EINVAL;
-#endif
+ for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
+ res = s->cb_dev->bus->resource[i];
+#else
pci_bus_for_each_resource(s->cb_dev->bus, res, i) {
+#endif
if (!res)
continue;
if (res->flags & IORESOURCE_IO) {
+ /* safeguard against the root resource, where the
+ * risk of hitting any other device would be too
+ * high */
if (res == &ioport_resource)
continue;
+
dev_printk(KERN_INFO, &s->cb_dev->dev,
"pcmcia: parent PCI bridge window: %pR\n",
res);
@@ -961,8 +980,12 @@ static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
}
if (res->flags & IORESOURCE_MEM) {
+ /* safeguard against the root resource, where the
+ * risk of hitting any other device would be too
+ * high */
if (res == &iomem_resource)
continue;
+
dev_printk(KERN_INFO, &s->cb_dev->dev,
"pcmcia: parent PCI bridge window: %pR\n",
res);
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