1 files changed, 14 insertions, 129 deletions

diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
index 414553bc115b..ebd74ab5abef 100644
--- a/drivers/char/tpm/tpm-dev.c
+++ b/drivers/char/tpm/tpm-dev.c
@@ -18,48 +18,15 @@
  *
  */
 #include <linux/slab.h>
-#include <linux/uaccess.h>
-#include "tpm.h"
-
-struct file_priv {
-	struct tpm_chip *chip;
-
-	/* Data passed to and from the tpm via the read/write calls */
-	atomic_t data_pending;
-	struct mutex buffer_mutex;
-
-	struct timer_list user_read_timer;      /* user needs to claim result */
-	struct work_struct work;
-
-	u8 data_buffer[TPM_BUFSIZE];
-};
-
-static void user_reader_timeout(unsigned long ptr)
-{
-	struct file_priv *priv = (struct file_priv *)ptr;
-
-	pr_warn("TPM user space timeout is deprecated (pid=%d)\n",
-		task_tgid_nr(current));
-
-	schedule_work(&priv->work);
-}
-
-static void timeout_work(struct work_struct *work)
-{
-	struct file_priv *priv = container_of(work, struct file_priv, work);
-
-	mutex_lock(&priv->buffer_mutex);
-	atomic_set(&priv->data_pending, 0);
-	memset(priv->data_buffer, 0, sizeof(priv->data_buffer));
-	mutex_unlock(&priv->buffer_mutex);
-}
+#include "tpm-dev.h"
 
 static int tpm_open(struct inode *inode, struct file *file)
 {
-	struct tpm_chip *chip =
-		container_of(inode->i_cdev, struct tpm_chip, cdev);
+	struct tpm_chip *chip;
 	struct file_priv *priv;
 
+	chip = container_of(inode->i_cdev, struct tpm_chip, cdev);
+
 	/* It's assured that the chip will be opened just once,
 	 * by the check of is_open variable, which is protected
 	 * by driver_lock. */
@@ -69,100 +36,22 @@ static int tpm_open(struct inode *inode, struct file *file)
 	}
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (priv == NULL) {
-		clear_bit(0, &chip->is_open);
-		return -ENOMEM;
-	}
+	if (priv == NULL)
+		goto out;
 
-	priv->chip = chip;
-	atomic_set(&priv->data_pending, 0);
-	mutex_init(&priv->buffer_mutex);
-	setup_timer(&priv->user_read_timer, user_reader_timeout,
-			(unsigned long)priv);
-	INIT_WORK(&priv->work, timeout_work);
+	tpm_common_open(file, chip, priv);
 
-	file->private_data = priv;
 	return 0;
-}
-
-static ssize_t tpm_read(struct file *file, char __user *buf,
-			size_t size, loff_t *off)
-{
-	struct file_priv *priv = file->private_data;
-	ssize_t ret_size;
-	int rc;
 
-	del_singleshot_timer_sync(&priv->user_read_timer);
-	flush_work(&priv->work);
-	ret_size = atomic_read(&priv->data_pending);
-	if (ret_size > 0) {	/* relay data */
-		ssize_t orig_ret_size = ret_size;
-		if (size < ret_size)
-			ret_size = size;
-
-		mutex_lock(&priv->buffer_mutex);
-		rc = copy_to_user(buf, priv->data_buffer, ret_size);
-		memset(priv->data_buffer, 0, orig_ret_size);
-		if (rc)
-			ret_size = -EFAULT;
-
-		mutex_unlock(&priv->buffer_mutex);
-	}
-
-	atomic_set(&priv->data_pending, 0);
-
-	return ret_size;
+ out:
+	clear_bit(0, &chip->is_open);
+	return -ENOMEM;
 }
 
 static ssize_t tpm_write(struct file *file, const char __user *buf,
 			 size_t size, loff_t *off)
 {
-	struct file_priv *priv = file->private_data;
-	size_t in_size = size;
-	ssize_t out_size;
-
-	/* cannot perform a write until the read has cleared
-	   either via tpm_read or a user_read_timer timeout.
-	   This also prevents splitted buffered writes from blocking here.
-	*/
-	if (atomic_read(&priv->data_pending) != 0)
-		return -EBUSY;
-
-	if (in_size > TPM_BUFSIZE)
-		return -E2BIG;
-
-	mutex_lock(&priv->buffer_mutex);
-
-	if (copy_from_user
-	    (priv->data_buffer, (void __user *) buf, in_size)) {
-		mutex_unlock(&priv->buffer_mutex);
-		return -EFAULT;
-	}
-
-	/* atomic tpm command send and result receive. We only hold the ops
-	 * lock during this period so that the tpm can be unregistered even if
-	 * the char dev is held open.
-	 */
-	if (tpm_try_get_ops(priv->chip)) {
-		mutex_unlock(&priv->buffer_mutex);
-		return -EPIPE;
-	}
-	out_size = tpm_transmit(priv->chip, NULL, priv->data_buffer,
-				sizeof(priv->data_buffer), 0);
-
-	tpm_put_ops(priv->chip);
-	if (out_size < 0) {
-		mutex_unlock(&priv->buffer_mutex);
-		return out_size;
-	}
-
-	atomic_set(&priv->data_pending, out_size);
-	mutex_unlock(&priv->buffer_mutex);
-
-	/* Set a timeout by which the reader must come claim the result */
-	mod_timer(&priv->user_read_timer, jiffies + (120 * HZ));
-
-	return in_size;
+	return tpm_common_write(file, buf, size, off, NULL);
 }
 
 /*
@@ -172,12 +61,10 @@ static int tpm_release(struct inode *inode, struct file *file)
 {
 	struct file_priv *priv = file->private_data;
 
-	del_singleshot_timer_sync(&priv->user_read_timer);
-	flush_work(&priv->work);
-	file->private_data = NULL;
-	atomic_set(&priv->data_pending, 0);
+	tpm_common_release(file, priv);
 	clear_bit(0, &priv->chip->is_open);
 	kfree(priv);
+
 	return 0;
 }
 
@@ -185,9 +72,7 @@ const struct file_operations tpm_fops = {
 	.owner = THIS_MODULE,
 	.llseek = no_llseek,
 	.open = tpm_open,
-	.read = tpm_read,
+	.read = tpm_common_read,
 	.write = tpm_write,
 	.release = tpm_release,
 };
-
-