pcmcia: do not use ioports < 0x100 on x86

On x86 systems using ACPI _CRS information -- now the default for
post-2008 systems -- the PCI root bus no longer pretends to be
offering the root ioport_resource. To avoid accidentally hitting
some platform / system device, use only I/O ports >= 0x100 for
PCMCIA devices on x86.

Reported-by: Komuro <komurojun-mbn@nifty.com>
CC: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/pcmcia/rsrc_nonstatic.c b/drivers/pcmcia/rsrc_nonstatic.c
index 4663b3fa9f9..dcc602134d9 100644
--- a/drivers/pcmcia/rsrc_nonstatic.c
+++ b/drivers/pcmcia/rsrc_nonstatic.c
@@ -810,6 +810,13 @@ static int adjust_io(struct pcmcia_socket *s, unsigned int action, unsigned long
         unsigned long size = end - start + 1;
         int ret = 0;
 
+#if defined(CONFIG_X86)
+        /* on x86, avoid anything < 0x100 for it is often used for
+         * legacy platform devices */
+        if (start < 0x100)
+                start = 0x100;
+#endif
+
         if (end < start)
                 return -EINVAL;