linux-kernel - [PATCH 1/4] TPM: update char dev BKL pushdown

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Message-Id: <1222190371-23814-1-git-send-email-srajiv@linux.vnet.ibm.com>
Date:	Tue, 23 Sep 2008 14:19:26 -0300
From:	Rajiv Andrade <srajiv@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, jmoriss@...ei.org,
	serue@...ux.vnet.ibm.com, zohar@...ux.vnet.ibm.com,
	safford@...son.ibm.com, paulmck@...ux.vnet.ibm.com,
	debora@...ux.vnet.ibm.com
Subject: [PATCH 1/4] TPM: update char dev BKL pushdown

This patch removes the BKL calls from the TPM driver, which
were added in the overall misc-char-dev-BKL-pushdown.patch,
as they are not needed.

Signed-off-by: Mimi Zohar <zohar@...ux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@...ux.vnet.ibm.com>

---
 drivers/char/tpm/tpm.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index ae766d8..ceba608 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -954,13 +954,16 @@ EXPORT_SYMBOL_GPL(tpm_store_cancel);
 
 /*
  * Device file system interface to the TPM
+ *
+ * It's assured that the chip will be opened just once,
+ * by the check of is_open variable, which is protected
+ * by driver_lock.
  */
 int tpm_open(struct inode *inode, struct file *file)
 {
 	int rc = 0, minor = iminor(inode);
 	struct tpm_chip *chip = NULL, *pos;
 
-	lock_kernel();
 	spin_lock(&driver_lock);
 
 	list_for_each_entry(pos, &tpm_chip_list, list) {
@@ -990,19 +993,16 @@ int tpm_open(struct inode *inode, struct file *file)
 	if (chip->data_buffer == NULL) {
 		chip->num_opens--;
 		put_device(chip->dev);
-		unlock_kernel();
 		return -ENOMEM;
 	}
 
 	atomic_set(&chip->data_pending, 0);
 
 	file->private_data = chip;
-	unlock_kernel();
 	return 0;
 
 err_out:
 	spin_unlock(&driver_lock);
-	unlock_kernel();
 	return rc;
 }
 EXPORT_SYMBOL_GPL(tpm_open);
-- 
1.5.6.3

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