[PATCH] tpm: check mem start and len

[Kylene Jo Hall <kjhall@us.ibm.com>]

The memory start and length values obtained from the ACPI entry need to
be checked and filled in with the default values from the specification
if they don't exist.  This patch fills in the default values and uses
them appropriately.

Signed-off-by: Kylie Hall <kjhall@us.ibm.com>
---
 drivers/char/tpm/tpm_tis.c |    7 +++++++
 1 files changed, 7 insertions(+)

--- linux-2.6.17-rc1-mm2/drivers/char/tpm/tpm_tis.c	2006-04-12 16:39:40.191345000 -0500
+++ linux-2.6.17-rc1/drivers/char/tpm/tpm_tis.c	2006-04-12 14:49:13.033173500 -0500
@@ -52,6 +52,8 @@ enum tis_int_flags {
 };
 
 enum tis_defaults {
+	TIS_MEM_BASE = 0xFED4000,
+	TIS_MEM_LEN = 0x5000,
 	TIS_SHORT_TIMEOUT = 750, /* ms */
 	TIS_LONG_TIMEOUT = 2000, /* 2 sec */
 };
@@ -437,6 +439,11 @@ static int __devinit tpm_tis_pnp_init(st
 	start = pnp_mem_start(pnp_dev, 0);
 	len = pnp_mem_len(pnp_dev, 0);
 
+	if (!start)
+		start = TIS_MEM_BASE; 
+	if (!len)
+		len = TIS_MEM_LEN;
+
 	if (!(chip = tpm_register_hardware(&pnp_dev->dev, &tpm_tis)))
 		return -ENODEV;