[PATCH] ACPI-based PCI resources: PCMCIA bugfix, but resources missing in trees

Don't auto-configure yenta sockets for PCMCIA devices if it is connected to
the root PCI bus on the x86 or x86_64 architectures.  Previously, this was
handled by the "ioport_resource"/"iomem_resource" check a few lines below,
but with the new ACPI-based resource handling this doesn't catch all cases
any longer.

pci-yenta-cardbus-fix.patch and this patch should solve the initialization
time trouble.  However, the ACPI-based PCI resource handling is badly
broken, IMHO:

- many resources of devices don't show up in the resource trees (
  /proc/iomem and /proc/ioports) any longer. This means that PCMCIA, but
  also possibly other subsystems (ISA, PnP, ...) do not know which resources
  it cannot use.

- verify_root_windows() should fail if there are no iomem _or_ ioport
  resources, not only if there are no iomem _and_ ioport resources.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 51aa04b7ecc9..c42455d20eb6 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -779,6 +779,17 @@ static int nonstatic_autoadd_resources(struct pcmcia_socket *s)
         if (!s->cb_dev || !s->cb_dev->bus)
                 return -ENODEV;
 
+#if defined(CONFIG_X86) || defined(CONFIG_X86_64)
+        /* 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 (s->cb_dev->bus->number == 0)
+                return -EINVAL;
+#endif
+
         for (i=0; i < PCI_BUS_NUM_RESOURCES; i++) {
                 res = s->cb_dev->bus->resource[i];
                 if (!res)