linux-kernel - [PATCH v6 1/2] tpm: add ptr to the tpm_space struct to file

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Message-ID: <153659990801.2284.8342428711970626698.stgit@tstruk-mobl1.jf.intel.com>
Date:   Mon, 10 Sep 2018 10:18:28 -0700
From:   Tadeusz Struk <tadeusz.struk@...el.com>
To:     jarkko.sakkinen@...ux.intel.com
Cc:     flihp@...bit.us, jgg@...pe.ca, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, tadeusz.struk@...el.com
Subject: [PATCH v6 1/2] tpm: add ptr to the tpm_space struct to file_priv

Add a ptr to struct tpm_space to the file_priv and consolidate
of the write operations for the two interfaces.

Tested-by: Philip Tricca <philip.b.tricca@...el.com>
Signed-off-by: Tadeusz Struk <tadeusz.struk@...el.com>
---
 drivers/char/tpm/tpm-dev-common.c |    8 +++++---
 drivers/char/tpm/tpm-dev.c        |   10 ++--------
 drivers/char/tpm/tpm-dev.h        |    5 +++--
 drivers/char/tpm/tpmrm-dev.c      |   14 ++------------
 4 files changed, 12 insertions(+), 25 deletions(-)

diff --git a/drivers/char/tpm/tpm-dev-common.c b/drivers/char/tpm/tpm-dev-common.c
index e4a04b2d3c32..f0c033b69b62 100644
--- a/drivers/char/tpm/tpm-dev-common.c
+++ b/drivers/char/tpm/tpm-dev-common.c
@@ -43,9 +43,11 @@ static void timeout_work(struct work_struct *work)
 }
 
 void tpm_common_open(struct file *file, struct tpm_chip *chip,
-		     struct file_priv *priv)
+		     struct file_priv *priv, struct tpm_space *space)
 {
 	priv->chip = chip;
+	priv->space = space;
+
 	mutex_init(&priv->buffer_mutex);
 	timer_setup(&priv->user_read_timer, user_reader_timeout, 0);
 	INIT_WORK(&priv->work, timeout_work);
@@ -79,7 +81,7 @@ ssize_t tpm_common_read(struct file *file, char __user *buf,
 }
 
 ssize_t tpm_common_write(struct file *file, const char __user *buf,
-			 size_t size, loff_t *off, struct tpm_space *space)
+			 size_t size, loff_t *off)
 {
 	struct file_priv *priv = file->private_data;
 	size_t in_size = size;
@@ -119,7 +121,7 @@ ssize_t tpm_common_write(struct file *file, const char __user *buf,
 		mutex_unlock(&priv->buffer_mutex);
 		return -EPIPE;
 	}
-	out_size = tpm_transmit(priv->chip, space, priv->data_buffer,
+	out_size = tpm_transmit(priv->chip, priv->space, priv->data_buffer,
 				sizeof(priv->data_buffer), 0);
 
 	tpm_put_ops(priv->chip);
diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
index ebd74ab5abef..98b9630c3a36 100644
--- a/drivers/char/tpm/tpm-dev.c
+++ b/drivers/char/tpm/tpm-dev.c
@@ -39,7 +39,7 @@ static int tpm_open(struct inode *inode, struct file *file)
 	if (priv == NULL)
 		goto out;
 
-	tpm_common_open(file, chip, priv);
+	tpm_common_open(file, chip, priv, NULL);
 
 	return 0;
 
@@ -48,12 +48,6 @@ static int tpm_open(struct inode *inode, struct file *file)
 	return -ENOMEM;
 }
 
-static ssize_t tpm_write(struct file *file, const char __user *buf,
-			 size_t size, loff_t *off)
-{
-	return tpm_common_write(file, buf, size, off, NULL);
-}
-
 /*
  * Called on file close
  */
@@ -73,6 +67,6 @@ const struct file_operations tpm_fops = {
 	.llseek = no_llseek,
 	.open = tpm_open,
 	.read = tpm_common_read,
-	.write = tpm_write,
+	.write = tpm_common_write,
 	.release = tpm_release,
 };
diff --git a/drivers/char/tpm/tpm-dev.h b/drivers/char/tpm/tpm-dev.h
index b24cfb4d3ee1..4048677bbd78 100644
--- a/drivers/char/tpm/tpm-dev.h
+++ b/drivers/char/tpm/tpm-dev.h
@@ -6,6 +6,7 @@
 
 struct file_priv {
 	struct tpm_chip *chip;
+	struct tpm_space *space;
 
 	/* Data passed to and from the tpm via the read/write calls */
 	size_t data_pending;
@@ -18,11 +19,11 @@ struct file_priv {
 };
 
 void tpm_common_open(struct file *file, struct tpm_chip *chip,
-		     struct file_priv *priv);
+		     struct file_priv *priv, struct tpm_space *space);
 ssize_t tpm_common_read(struct file *file, char __user *buf,
 			size_t size, loff_t *off);
 ssize_t tpm_common_write(struct file *file, const char __user *buf,
-			 size_t size, loff_t *off, struct tpm_space *space);
+			 size_t size, loff_t *off);
 void tpm_common_release(struct file *file, struct file_priv *priv);
 
 #endif
diff --git a/drivers/char/tpm/tpmrm-dev.c b/drivers/char/tpm/tpmrm-dev.c
index 1a0e97a5da5a..96006c6b9696 100644
--- a/drivers/char/tpm/tpmrm-dev.c
+++ b/drivers/char/tpm/tpmrm-dev.c
@@ -28,7 +28,7 @@ static int tpmrm_open(struct inode *inode, struct file *file)
 		return -ENOMEM;
 	}
 
-	tpm_common_open(file, chip, &priv->priv);
+	tpm_common_open(file, chip, &priv->priv, &priv->space);
 
 	return 0;
 }
@@ -45,21 +45,11 @@ static int tpmrm_release(struct inode *inode, struct file *file)
 	return 0;
 }
 
-static ssize_t tpmrm_write(struct file *file, const char __user *buf,
-		   size_t size, loff_t *off)
-{
-	struct file_priv *fpriv = file->private_data;
-	struct tpmrm_priv *priv = container_of(fpriv, struct tpmrm_priv, priv);
-
-	return tpm_common_write(file, buf, size, off, &priv->space);
-}
-
 const struct file_operations tpmrm_fops = {
 	.owner = THIS_MODULE,
 	.llseek = no_llseek,
 	.open = tpmrm_open,
 	.read = tpm_common_read,
-	.write = tpmrm_write,
+	.write = tpm_common_write,
 	.release = tpmrm_release,
 };
-