TPM: Export wait_for_stat for other vendor specific drivers

Moved wait_for_stat to tpm.c so that other drivers can use it.
Also renamed it to avoid future namespace conflicts.

Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>

drivers/char/tpm/tpm.c

@@ -27,6 +27,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/spinlock.h>
+#include <linux/freezer.h>
 
 #include "tpm.h"
 
@@ -1057,6 +1058,46 @@ ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
 }
 EXPORT_SYMBOL_GPL(tpm_store_cancel);
 
+int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
+			 wait_queue_head_t *queue)
+{
+	unsigned long stop;
+	long rc;
+	u8 status;
+
+	/* check current status */
+	status = chip->vendor.status(chip);
+	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,
+						      ((chip->vendor.status(chip)
+						      & mask) == mask),
+						      timeout);
+		if (rc > 0)
+			return 0;
+		if (rc == -ERESTARTSYS && freezing(current)) {
+			clear_thread_flag(TIF_SIGPENDING);
+			goto again;
+		}
+	} else {
+		do {
+			msleep(TPM_TIMEOUT);
+			status = chip->vendor.status(chip);
+			if ((status & mask) == mask)
+				return 0;
+		} while (time_before(jiffies, stop));
+	}
+	return -ETIME;
+}
+EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
 /*
  * Device file system interface to the TPM
  *

drivers/char/tpm/tpm.h

@@ -296,7 +296,8 @@ extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *);
 extern void tpm_remove_hardware(struct device *);
 extern int tpm_pm_suspend(struct device *, pm_message_t);
 extern int tpm_pm_resume(struct device *);
-
+extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
+			     wait_queue_head_t *);
 #ifdef CONFIG_ACPI
 extern struct dentry ** tpm_bios_log_setup(char *);
 extern void tpm_bios_log_teardown(struct dentry **);

drivers/char/tpm/tpm_tis.c

@@ -193,54 +193,14 @@ static int get_burstcount(struct tpm_chip *chip)
 	return -EBUSY;
 }
 
-static int wait_for_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
-			 wait_queue_head_t *queue)
-{
-	unsigned long stop;
-	long rc;
-	u8 status;
-
-	/* check current status */
-	status = chip->vendor.status(chip);
-	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,
-						      ((chip->vendor.status(chip)
-						      & mask) == mask),
-						      timeout);
-		if (rc > 0)
-			return 0;
-		if (rc == -ERESTARTSYS && freezing(current)) {
-			clear_thread_flag(TIF_SIGPENDING);
-			goto again;
-		}
-	} else {
-		do {
-			msleep(TPM_TIMEOUT);
-			status = chip->vendor.status(chip);
-			if ((status & mask) == mask)
-				return 0;
-		} while (time_before(jiffies, stop));
-	}
-	return -ETIME;
-}
-
 static int recv_data(struct tpm_chip *chip, u8 *buf, size_t count)
 {
 	int size = 0, burstcnt;
 	while (size < count &&
-	       wait_for_stat(chip,
-			     TPM_STS_DATA_AVAIL | TPM_STS_VALID,
-			     chip->vendor.timeout_c,
-			     &chip->vendor.read_queue)
+	       wait_for_tpm_stat(chip,
+				 TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+				 chip->vendor.timeout_c,
+				 &chip->vendor.read_queue)
 	       == 0) {
 		burstcnt = get_burstcount(chip);
 		for (; burstcnt > 0 && size < count; burstcnt--)
@@ -282,8 +242,8 @@ static int tpm_tis_recv(struct tpm_chip *chip, u8 *buf, size_t count)
 		goto out;
 	}
 
-	wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
-		      &chip->vendor.int_queue);
+	wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
+			  &chip->vendor.int_queue);
 	status = tpm_tis_status(chip);
 	if (status & TPM_STS_DATA_AVAIL) {	/* retry? */
 		dev_err(chip->dev, "Error left over data\n");
@@ -317,7 +277,7 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 	status = tpm_tis_status(chip);
 	if ((status & TPM_STS_COMMAND_READY) == 0) {
 		tpm_tis_ready(chip);
-		if (wait_for_stat
+		if (wait_for_tpm_stat
 		    (chip, TPM_STS_COMMAND_READY, chip->vendor.timeout_b,
 		     &chip->vendor.int_queue) < 0) {
 			rc = -ETIME;
@@ -333,8 +293,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 			count++;
 		}
 
-		wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
-			      &chip->vendor.int_queue);
+		wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
+				  &chip->vendor.int_queue);
 		status = tpm_tis_status(chip);
 		if (!itpm && (status & TPM_STS_DATA_EXPECT) == 0) {
 			rc = -EIO;
@@ -345,8 +305,8 @@ static int tpm_tis_send_data(struct tpm_chip *chip, u8 *buf, size_t len)
 	/* write last byte */
 	iowrite8(buf[count],
 		 chip->vendor.iobase + TPM_DATA_FIFO(chip->vendor.locality));
-	wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
-		      &chip->vendor.int_queue);
+	wait_for_tpm_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
+			  &chip->vendor.int_queue);
 	status = tpm_tis_status(chip);
 	if ((status & TPM_STS_DATA_EXPECT) != 0) {
 		rc = -EIO;
@@ -381,7 +341,7 @@ static int tpm_tis_send(struct tpm_chip *chip, u8 *buf, size_t len)
 
 	if (chip->vendor.irq) {
 		ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
-		if (wait_for_stat
+		if (wait_for_tpm_stat
 		    (chip, TPM_STS_DATA_AVAIL | TPM_STS_VALID,
 		     tpm_calc_ordinal_duration(chip, ordinal),
 		     &chip->vendor.read_queue) < 0) {