ISAPNP: handle independent options following dependent ones

The ISAPNP spec recommends that independent options precede
dependent ones, but this is not actually required.  The current
ISAPNP code incorrectly puts such trailing independent options
at the end of the last dependent option list.

This patch fixes that bug by resetting the current option list
to the independent list when we see an "End Dependent Functions"
tag.  PNPBIOS and PNPACPI handle this the same way.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Rene Herman <rene.herman@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
index 90718be66463..53cc4d6133e6 100644
--- a/drivers/pnp/isapnp/core.c
+++ b/drivers/pnp/isapnp/core.c
@@ -584,14 +584,14 @@ static int __init isapnp_create_device(struct pnp_card *card,
 {
         int number = 0, skip = 0, priority, compat = 0;
         unsigned char type, tmp[17];
-        struct pnp_option *option;
+        struct pnp_option *option, *option_independent;
         struct pnp_dev *dev;
         u32 eisa_id;
         char id[8];
 
         if ((dev = isapnp_parse_device(card, size, number++)) == NULL)
                 return 1;
-        option = pnp_register_independent_option(dev);
+        option_independent = option = pnp_register_independent_option(dev);
         if (!option) {
                 kfree(dev);
                 return 1;
@@ -613,6 +613,7 @@ static int __init isapnp_create_device(struct pnp_card *card,
                                 size = 0;
                                 skip = 0;
                                 option = pnp_register_independent_option(dev);
+                                option_independent = option;
                                 if (!option) {
                                         kfree(dev);
                                         return 1;
@@ -662,6 +663,10 @@ static int __init isapnp_create_device(struct pnp_card *card,
                 case _STAG_ENDDEP:
                         if (size != 0)
                                 goto __skip;
+                        if (option_independent == option)
+                                dev_warn(&dev->dev, "missing "
+                                         "_STAG_STARTDEP tag\n");
+                        option = option_independent;
                         dev_dbg(&dev->dev, "end dependent options\n");
                         break;
                 case _STAG_IOPORT: