Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: (54 commits)
  tpm_nsc: Fix bug when loading multiple TPM drivers
  tpm: Move tpm_tis_reenable_interrupts out of CONFIG_PNP block
  tpm: Fix compilation warning when CONFIG_PNP is not defined
  TOMOYO: Update kernel-doc.
  tpm: Fix a typo
  tpm_tis: Probing function for Intel iTPM bug
  tpm_tis: Fix the probing for interrupts
  tpm_tis: Delay ACPI S3 suspend while the TPM is busy
  tpm_tis: Re-enable interrupts upon (S3) resume
  tpm: Fix display of data in pubek sysfs entry
  tpm_tis: Add timeouts sysfs entry
  tpm: Adjust interface timeouts if they are too small
  tpm: Use interface timeouts returned from the TPM
  tpm_tis: Introduce durations sysfs entry
  tpm: Adjust the durations if they are too small
  tpm: Use durations returned from TPM
  TOMOYO: Enable conditional ACL.
  TOMOYO: Allow using argv[]/envp[] of execve() as conditions.
  TOMOYO: Allow using executable's realpath and symlink's target as conditions.
  TOMOYO: Allow using owner/group etc. of file objects as conditions.
  ...

Fix up trivial conflict in security/tomoyo/realpath.c

4 files changed, 250 insertions, 55 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 7beb0e25f1e..caf8012ef47 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -534,6 +534,7 @@ void tpm_get_timeouts(struct tpm_chip *chip)
 	struct duration_t *duration_cap;
 	ssize_t rc;
 	u32 timeout;
+	unsigned int scale = 1;
 
 	tpm_cmd.header.in = tpm_getcap_header;
 	tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
@@ -545,24 +546,30 @@ void tpm_get_timeouts(struct tpm_chip *chip)
 	if (rc)
 		goto duration;
 
-	if (be32_to_cpu(tpm_cmd.header.out.length)
-	    != 4 * sizeof(u32))
-		goto duration;
+	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) + 4 * sizeof(u32))
+		return;
 
 	timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
 	/* Don't overwrite default if value is 0 */
 	timeout = be32_to_cpu(timeout_cap->a);
+	if (timeout && timeout < 1000) {
+		/* timeouts in msec rather usec */
+		scale = 1000;
+		chip->vendor.timeout_adjusted = true;
+	}
 	if (timeout)
-		chip->vendor.timeout_a = usecs_to_jiffies(timeout);
+		chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
 	timeout = be32_to_cpu(timeout_cap->b);
 	if (timeout)
-		chip->vendor.timeout_b = usecs_to_jiffies(timeout);
+		chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
 	timeout = be32_to_cpu(timeout_cap->c);
 	if (timeout)
-		chip->vendor.timeout_c = usecs_to_jiffies(timeout);
+		chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
 	timeout = be32_to_cpu(timeout_cap->d);
 	if (timeout)
-		chip->vendor.timeout_d = usecs_to_jiffies(timeout);
+		chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
 
 duration:
 	tpm_cmd.header.in = tpm_getcap_header;
@@ -575,23 +582,31 @@ duration:
 	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));
+	chip->vendor.duration[TPM_MEDIUM] =
+	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
+	chip->vendor.duration[TPM_LONG] =
+	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
+
 	/* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
 	 * value wrong and apparently reports msecs rather than usecs. So we
 	 * fix up the resulting too-small TPM_SHORT value to make things work.
+	 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
 	 */
-	if (chip->vendor.duration[TPM_SHORT] < (HZ/100))
+	if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
 		chip->vendor.duration[TPM_SHORT] = HZ;
-
-	chip->vendor.duration[TPM_MEDIUM] =
-	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
-	chip->vendor.duration[TPM_LONG] =
-	    usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
+		chip->vendor.duration[TPM_MEDIUM] *= 1000;
+		chip->vendor.duration[TPM_LONG] *= 1000;
+		chip->vendor.duration_adjusted = true;
+		dev_info(chip->dev, "Adjusting TPM timeout parameters.");
+	}
 }
 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
 
@@ -600,7 +615,7 @@ void tpm_continue_selftest(struct tpm_chip *chip)
 	u8 data[] = {
 		0, 193,			/* TPM_TAG_RQU_COMMAND */
 		0, 0, 0, 10,		/* length */
-		0, 0, 0, 83,		/* TPM_ORD_GetCapability */
+		0, 0, 0, 83,		/* TPM_ORD_ContinueSelfTest */
 	};
 
 	tpm_transmit(chip, data, sizeof(data));
@@ -863,18 +878,24 @@ ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
 	data = tpm_cmd.params.readpubek_out_buffer;
 	str +=
 	    sprintf(str,
-		    "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
-		    "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
-		    " %02X %02X %02X %02X %02X %02X %02X %02X\n"
-		    "Modulus length: %d\nModulus: \n",
-		    data[10], data[11], data[12], data[13], data[14],
-		    data[15], data[16], data[17], data[22], data[23],
-		    data[24], data[25], data[26], data[27], data[28],
-		    data[29], data[30], data[31], data[32], data[33],
-		    be32_to_cpu(*((__be32 *) (data + 34))));
+		    "Algorithm: %02X %02X %02X %02X\n"
+		    "Encscheme: %02X %02X\n"
+		    "Sigscheme: %02X %02X\n"
+		    "Parameters: %02X %02X %02X %02X "
+		    "%02X %02X %02X %02X "
+		    "%02X %02X %02X %02X\n"
+		    "Modulus length: %d\n"
+		    "Modulus:\n",
+		    data[0], data[1], data[2], data[3],
+		    data[4], data[5],
+		    data[6], data[7],
+		    data[12], data[13], data[14], data[15],
+		    data[16], data[17], data[18], data[19],
+		    data[20], data[21], data[22], data[23],
+		    be32_to_cpu(*((__be32 *) (data + 24))));
 
 	for (i = 0; i < 256; i++) {
-		str += sprintf(str, "%02X ", data[i + 38]);
+		str += sprintf(str, "%02X ", data[i + 28]);
 		if ((i + 1) % 16 == 0)
 			str += sprintf(str, "\n");
 	}
@@ -937,6 +958,35 @@ ssize_t tpm_show_caps_1_2(struct device * dev,
 }
 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
 
+ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct tpm_chip *chip = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%d %d %d [%s]\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]),
+		       chip->vendor.duration_adjusted
+		       ? "adjusted" : "original");
+}
+EXPORT_SYMBOL_GPL(tpm_show_durations);
+
+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 %d [%s]\n",
+		       jiffies_to_usecs(chip->vendor.timeout_a),
+		       jiffies_to_usecs(chip->vendor.timeout_b),
+		       jiffies_to_usecs(chip->vendor.timeout_c),
+		       jiffies_to_usecs(chip->vendor.timeout_d),
+		       chip->vendor.timeout_adjusted
+		       ? "adjusted" : "original");
+}
+EXPORT_SYMBOL_GPL(tpm_show_timeouts);
+
 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 			const char *buf, size_t count)
 {
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 72ddb031b69..9c4163cfa3c 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -56,6 +56,10 @@ extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
 				char *);
 extern ssize_t tpm_show_temp_deactivated(struct device *,
 					 struct device_attribute *attr, char *);
+extern ssize_t tpm_show_durations(struct device *,
+				  struct device_attribute *attr, char *);
+extern ssize_t tpm_show_timeouts(struct device *,
+				 struct device_attribute *attr, char *);
 
 struct tpm_chip;
 
@@ -67,6 +71,7 @@ struct tpm_vendor_specific {
 	unsigned long base;		/* TPM base address */
 
 	int irq;
+	int probed_irq;
 
 	int region_size;
 	int have_region;
@@ -81,7 +86,9 @@ struct tpm_vendor_specific {
 	struct list_head list;
 	int locality;
 	unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
+	bool timeout_adjusted;
 	unsigned long duration[3]; /* jiffies */
+	bool duration_adjusted;
 
 	wait_queue_head_t read_queue;
 	wait_queue_head_t int_queue;
diff --git a/drivers/char/tpm/tpm_nsc.c b/drivers/char/tpm/tpm_nsc.c
index a605cb7dd89..82facc9104c 100644
--- a/drivers/char/tpm/tpm_nsc.c
+++ b/drivers/char/tpm/tpm_nsc.c
@@ -330,12 +330,12 @@ static int __init init_nsc(void)
 	pdev->dev.driver = &nsc_drv.driver;
 	pdev->dev.release = tpm_nsc_remove;
 
-	if ((rc = platform_device_register(pdev)) < 0)
-		goto err_free_dev;
+	if ((rc = platform_device_add(pdev)) < 0)
+		goto err_put_dev;
 
 	if (request_region(base, 2, "tpm_nsc0") == NULL ) {
 		rc = -EBUSY;
-		goto err_unreg_dev;
+		goto err_del_dev;
 	}
 
 	if (!(chip = tpm_register_hardware(&pdev->dev, &tpm_nsc))) {
@@ -382,10 +382,10 @@ static int __init init_nsc(void)
 
 err_rel_reg:
 	release_region(base, 2);
-err_unreg_dev:
-	platform_device_unregister(pdev);
-err_free_dev:
-	kfree(pdev);
+err_del_dev:
+	platform_device_del(pdev);
+err_put_dev:
+	platform_device_put(pdev);
 err_unreg_drv:
 	platform_driver_unregister(&nsc_drv);
 	return rc;
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index dd21df55689..7fc2f108f49 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -26,6 +26,7 @@
 #include <linux/interrupt.h>
 #include <linux/wait.h>
 #include <linux/acpi.h>
+#include <linux/freezer.h>
 #include "tpm.h"
 
 #define TPM_HEADER_SIZE 10
@@ -79,7 +80,7 @@ enum tis_defaults {
 static LIST_HEAD(tis_chips);
 static DEFINE_SPINLOCK(tis_lock);
 
-#ifdef CONFIG_ACPI
+#ifdef CONFIG_PNP
 static int is_itpm(struct pnp_dev *dev)
 {
 	struct acpi_device *acpi = pnp_acpi_device(dev);
@@ -92,11 +93,6 @@ static int is_itpm(struct pnp_dev *dev)
 
 	return 0;
 }
-#else
-static int is_itpm(struct pnp_dev *dev)
-{
-	return 0;
-}
 #endif
 
 static int check_locality(struct tpm_chip *chip, int l)
@@ -120,7 +116,7 @@ static void release_locality(struct tpm_chip *chip, int l, int force)
 
 static int request_locality(struct tpm_chip *chip, int l)
 {
-	unsigned long stop;
+	unsigned long stop, timeout;
 	long rc;
 
 	if (check_locality(chip, l) >= 0)
@@ -129,17 +125,25 @@ static int request_locality(struct tpm_chip *chip, int l)
 	iowrite8(TPM_ACCESS_REQUEST_USE,
 		 chip->vendor.iobase + TPM_ACCESS(l));
 
+	stop = jiffies + chip->vendor.timeout_a;
+
 	if (chip->vendor.irq) {
+again:
+		timeout = stop - jiffies;
+		if ((long)timeout <= 0)
+			return -1;
 		rc = wait_event_interruptible_timeout(chip->vendor.int_queue,
 						      (check_locality
 						       (chip, l) >= 0),
-						      chip->vendor.timeout_a);
+						      timeout);
 		if (rc > 0)
 			return l;
-
+		if (rc == -ERESTARTSYS && freezing(current)) {
+			clear_thread_flag(TIF_SIGPENDING);
+			goto again;
+		}
 	} else {
 		/* wait for burstcount */
-		stop = jiffies + chip->vendor.timeout_a;
 		do {
 			if (check_locality(chip, l) >= 0)
 				return l;
@@ -196,15 +200,24 @@ static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
 	if ((status & mask) == mask)
 		return 0;
 
+	stop = jiffies + timeout;
+
 	if (chip->vendor.irq) {
+again:
+		timeout = stop - jiffies;
+		if ((long)timeout <= 0)
+			return -ETIME;
 		rc = wait_event_interruptible_timeout(*queue,
 						      ((tpm_tis_status
 							(chip) & mask) ==
 						       mask), timeout);
 		if (rc > 0)
 			return 0;
+		if (rc == -ERESTARTSYS && freezing(current)) {
+			clear_thread_flag(TIF_SIGPENDING);
+			goto again;
+		}
 	} else {
-		stop = jiffies + timeout;
 		do {
 			msleep(TPM_TIMEOUT);
 			status = tpm_tis_status(chip);
@@ -288,11 +301,10 @@ MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
  * tpm.c can skip polling for the data to be available as the interrupt is
  * waited for here
  */
-static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
+static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 {
 	int rc, status, burstcnt;
 	size_t count = 0;
-	u32 ordinal;
 
 	if (request_locality(chip, 0) < 0)
 		return -EBUSY;
@@ -327,8 +339,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 
 	/* write last byte */
 	iowrite8(buf[count],
-		 chip->vendor.iobase +
-		 TPM_DATA_FIFO(chip->vendor.locality));
+		 chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
 	wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 		      &chip->vendor.int_queue);
 	status = tpm_tis_status(chip);
@@ -337,6 +348,28 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 		goto out_err;
 	}
 
+	return 0;
+
+out_err:
+	tpm_tis_ready(chip);
+	release_locality(chip, chip->vendor.locality, 0);
+	return rc;
+}
+
+/*
+ * If interrupts are used (signaled by an irq set in the vendor structure)
+ * tpm.c can skip polling for the data to be available as the interrupt is
+ * waited for here
+ */
+static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
+{
+	int rc;
+	u32 ordinal;
+
+	rc = tpm_tis_send_data(chip, buf, len);
+	if (rc < 0)
+		return rc;
+
 	/* go and do it */
 	iowrite8(TPM_STS_GO,
 		 chip->vendor.iobase + TPM_STS(chip->vendor.locality));
@@ -358,6 +391,47 @@ out_err:
 	return rc;
 }
 
+/*
+ * Early probing for iTPM with STS_DATA_EXPECT flaw.
+ * Try sending command without itpm flag set and if that
+ * fails, repeat with itpm flag set.
+ */
+static int probe_itpm(struct tpm_chip *chip)
+{
+	int rc = 0;
+	u8 cmd_getticks[] = {
+		0x00, 0xc1, 0x00, 0x00, 0x00, 0x0a,
+		0x00, 0x00, 0x00, 0xf1
+	};
+	size_t len = sizeof(cmd_getticks);
+	int rem_itpm = itpm;
+
+	itpm = 0;
+
+	rc = tpm_tis_send_data(chip, cmd_getticks, len);
+	if (rc == 0)
+		goto out;
+
+	tpm_tis_ready(chip);
+	release_locality(chip, chip->vendor.locality, 0);
+
+	itpm = 1;
+
+	rc = tpm_tis_send_data(chip, cmd_getticks, len);
+	if (rc == 0) {
+		dev_info(chip->dev, "Detected an iTPM.\n");
+		rc = 1;
+	} else
+		rc = -EFAULT;
+
+out:
+	itpm = rem_itpm;
+	tpm_tis_ready(chip);
+	release_locality(chip, chip->vendor.locality, 0);
+
+	return rc;
+}
+
 static const struct file_operations tis_ops = {
 	.owner = THIS_MODULE,
 	.llseek = no_llseek,
@@ -376,6 +450,8 @@ static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 		   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(durations, S_IRUGO, tpm_show_durations, NULL);
+static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 
 static struct attribute *tis_attrs[] = {
 	&dev_attr_pubek.attr,
@@ -385,7 +461,9 @@ static struct attribute *tis_attrs[] = {
 	&dev_attr_owned.attr,
 	&dev_attr_temp_deactivated.attr,
 	&dev_attr_caps.attr,
-	&dev_attr_cancel.attr, NULL,
+	&dev_attr_cancel.attr,
+	&dev_attr_durations.attr,
+	&dev_attr_timeouts.attr, NULL,
 };
 
 static struct attribute_group tis_attr_grp = {
@@ -416,7 +494,7 @@ static irqreturn_t tis_int_probe(int irq, void *dev_id)
 	if (interrupt == 0)
 		return IRQ_NONE;
 
-	chip->vendor.irq = irq;
+	chip->vendor.probed_irq = irq;
 
 	/* Clear interrupts handled with TPM_EOI */
 	iowrite32(interrupt,
@@ -464,7 +542,7 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 			resource_size_t len, unsigned int irq)
 {
 	u32 vendor, intfcaps, intmask;
-	int rc, i;
+	int rc, i, irq_s, irq_e;
 	struct tpm_chip *chip;
 
 	if (!(chip = tpm_register_hardware(dev, &tpm_tis)))
@@ -493,6 +571,14 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 		 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
 
+	if (!itpm) {
+		itpm = probe_itpm(chip);
+		if (itpm < 0) {
+			rc = -ENODEV;
+			goto out_err;
+		}
+	}
+
 	if (itpm)
 		dev_info(dev, "Intel iTPM workaround enabled\n");
 
@@ -522,6 +608,9 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 	if (intfcaps & TPM_INTF_DATA_AVAIL_INT)
 		dev_dbg(dev, "\tData Avail Int Support\n");
 
+	/* get the timeouts before testing for irqs */
+	tpm_get_timeouts(chip);
+
 	/* INTERRUPT Setup */
 	init_waitqueue_head(&chip->vendor.read_queue);
 	init_waitqueue_head(&chip->vendor.int_queue);
@@ -540,13 +629,19 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 	if (interrupts)
 		chip->vendor.irq = irq;
 	if (interrupts && !chip->vendor.irq) {
-		chip->vendor.irq =
+		irq_s =
 		    ioread8(chip->vendor.iobase +
 			    TPM_INT_VECTOR(chip->vendor.locality));
+		if (irq_s) {
+			irq_e = irq_s;
+		} else {
+			irq_s = 3;
+			irq_e = 15;
+		}
 
-		for (i = 3; i < 16 && chip->vendor.irq == 0; i++) {
+		for (i = irq_s; i <= irq_e && chip->vendor.irq == 0; i++) {
 			iowrite8(i, chip->vendor.iobase +
-				    TPM_INT_VECTOR(chip->vendor.locality));
+				 TPM_INT_VECTOR(chip->vendor.locality));
 			if (request_irq
 			    (i, tis_int_probe, IRQF_SHARED,
 			     chip->vendor.miscdev.name, chip) != 0) {
@@ -568,9 +663,22 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 				  chip->vendor.iobase +
 				  TPM_INT_ENABLE(chip->vendor.locality));
 
+			chip->vendor.probed_irq = 0;
+
 			/* Generate Interrupts */
 			tpm_gen_interrupt(chip);
 
+			chip->vendor.irq = chip->vendor.probed_irq;
+
+			/* free_irq will call into tis_int_probe;
+			   clear all irqs we haven't seen while doing
+			   tpm_gen_interrupt */
+			iowrite32(ioread32
+				  (chip->vendor.iobase +
+				   TPM_INT_STATUS(chip->vendor.locality)),
+				  chip->vendor.iobase +
+				  TPM_INT_STATUS(chip->vendor.locality));
+
 			/* Turn off */
 			iowrite32(intmask,
 				  chip->vendor.iobase +
@@ -609,7 +717,6 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
 	list_add(&chip->vendor.list, &tis_chips);
 	spin_unlock(&tis_lock);
 
-	tpm_get_timeouts(chip);
 	tpm_continue_selftest(chip);
 
 	return 0;
@@ -619,6 +726,29 @@ out_err:
 	tpm_remove_hardware(chip->dev);
 	return rc;
 }
+
+static void tpm_tis_reenable_interrupts(struct tpm_chip *chip)
+{
+	u32 intmask;
+
+	/* reenable interrupts that device may have lost or
+	   BIOS/firmware may have disabled */
+	iowrite8(chip->vendor.irq, chip->vendor.iobase +
+		 TPM_INT_VECTOR(chip->vendor.locality));
+
+	intmask =
+	    ioread32(chip->vendor.iobase +
+		     TPM_INT_ENABLE(chip->vendor.locality));
+
+	intmask |= TPM_INTF_CMD_READY_INT
+	    | TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_DATA_AVAIL_INT
+	    | TPM_INTF_STS_VALID_INT | TPM_GLOBAL_INT_ENABLE;
+
+	iowrite32(intmask,
+		  chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor.locality));
+}
+
+
 #ifdef CONFIG_PNP
 static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
 				      const struct pnp_device_id *pnp_id)
@@ -650,6 +780,9 @@ static int tpm_tis_pnp_resume(struct pnp_dev *dev)
 	struct tpm_chip *chip = pnp_get_drvdata(dev);
 	int ret;
 
+	if (chip->vendor.irq)
+		tpm_tis_reenable_interrupts(chip);
+
 	ret = tpm_pm_resume(&dev->dev);
 	if (!ret)
 		tpm_continue_selftest(chip);
@@ -702,6 +835,11 @@ static int tpm_tis_suspend(struct platform_device *dev, pm_message_t msg)
 
 static int tpm_tis_resume(struct platform_device *dev)
 {
+	struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
+
+	if (chip->vendor.irq)
+		tpm_tis_reenable_interrupts(chip);
+
 	return tpm_pm_resume(&dev->dev);
 }
 static struct platform_driver tis_drv = {