[PATCH] [73/275] tpm_tis: Use timeouts returned from TPM

[Andi Kleen]

2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx>

commit 9b29050f8f75916f974a2d231ae5d3cd59792296 upstream.

The current TPM TIS driver in git discards the timeout values returned
from the TPM. The check of the response packet needs to consider that
the return_code field is 0 on success and the size of the expected
packet is equivalent to the header size + u32 length indicator for the
TPM_GetCapability() result + 3 timeout indicators of type u32.

I am also adding a sysfs entry 'timeouts' showing the timeouts that are
being used.

Signed-off-by: Stefan Berger <stefanb@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Tested-by: Guillaume Chazarain <guichaz@xxxxxxxxx>
Signed-off-by: Rajiv Andrade <srajiv@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/char/tpm/tpm.c     |   18 ++++++++++++++++--
 drivers/char/tpm/tpm.h     |    2 ++
 drivers/char/tpm/tpm_tis.c |    4 +++-
 3 files changed, 21 insertions(+), 3 deletions(-)

Index: linux-2.6.35.y/drivers/char/tpm/tpm.c
===================================================================
--- linux-2.6.35.y.orig/drivers/char/tpm/tpm.c	2011-03-29 23:02:59.667308683 -0700
+++ linux-2.6.35.y/drivers/char/tpm/tpm.c	2011-03-29 23:02:59.685308223 -0700
@@ -567,9 +567,11 @@
 	if (rc)
 		return;
 
-	if (be32_to_cpu(tpm_cmd.header.out.return_code)
-	    != 3 * sizeof(u32))
+	if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
+	    be32_to_cpu(tpm_cmd.header.out.length)
+	    != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
 		return;
+
 	duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
 	chip->vendor.duration[TPM_SHORT] =
 	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
@@ -913,6 +915,18 @@
 }
 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
 
+ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d %d %d\n",
+	               jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
+	               jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
+	               jiffies_to_usecs(chip->vendor.duration[TPM_LONG]));
+}
+EXPORT_SYMBOL_GPL(tpm_show_timeouts);
+
 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 			const char *buf, size_t count)
 {
Index: linux-2.6.35.y/drivers/char/tpm/tpm.h
===================================================================
--- linux-2.6.35.y.orig/drivers/char/tpm/tpm.h	2011-03-29 22:51:40.876677237 -0700
+++ linux-2.6.35.y/drivers/char/tpm/tpm.h	2011-03-29 23:02:59.685308223 -0700
@@ -56,6 +56,8 @@
 				char *);
 extern ssize_t tpm_show_temp_deactivated(struct device *,
 					 struct device_attribute *attr, char *);
+extern ssize_t tpm_show_timeouts(struct device *,
+				 struct device_attribute *attr, char *);
 
 struct tpm_chip;
 
Index: linux-2.6.35.y/drivers/char/tpm/tpm_tis.c
===================================================================
--- linux-2.6.35.y.orig/drivers/char/tpm/tpm_tis.c	2011-03-29 22:51:40.877677211 -0700
+++ linux-2.6.35.y/drivers/char/tpm/tpm_tis.c	2011-03-29 23:02:59.686308198 -0700
@@ -355,6 +355,7 @@
 		   NULL);
 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
+static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 
 static struct attribute *tis_attrs[] = {
 	&dev_attr_pubek.attr,
@@ -364,7 +365,8 @@
 	&dev_attr_owned.attr,
 	&dev_attr_temp_deactivated.attr,
 	&dev_attr_caps.attr,
-	&dev_attr_cancel.attr, NULL,
+	&dev_attr_cancel.attr,
+	&dev_attr_timeouts.attr, NULL,
 };
 
 static struct attribute_group tis_attr_grp = {
--
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