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Subject[PATCH 1/5] TPM: update char dev BKL pushdown
Date
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@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.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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