提交 dc36d32c 编写于 作者: R Rajiv Andrade 提交者: James Morris

Renames num_open to is_open, as only one process can open the file at a time.

Signed-off-by: NMimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: NRajiv Andrade <srajiv@linux.vnet.ibm.com>
Cc: "Serge E. Hallyn" <serue@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NJames Morris <jmorris@namei.org>
上级 f89c5edb
......@@ -978,20 +978,19 @@ int tpm_open(struct inode *inode, struct file *file)
goto err_out;
}
if (chip->num_opens) {
if (test_and_set_bit(0, &chip->is_open)) {
dev_dbg(chip->dev, "Another process owns this TPM\n");
rc = -EBUSY;
goto err_out;
}
chip->num_opens++;
get_device(chip->dev);
spin_unlock(&driver_lock);
chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
if (chip->data_buffer == NULL) {
chip->num_opens--;
clear_bit(0, &chip->is_open);
put_device(chip->dev);
return -ENOMEM;
}
......@@ -1016,7 +1015,7 @@ int tpm_release(struct inode *inode, struct file *file)
file->private_data = NULL;
del_singleshot_timer_sync(&chip->user_read_timer);
atomic_set(&chip->data_pending, 0);
chip->num_opens--;
clear_bit(0, &chip->is_open);
put_device(chip->dev);
kfree(chip->data_buffer);
spin_unlock(&driver_lock);
......
......@@ -90,7 +90,7 @@ struct tpm_chip {
struct device *dev; /* Device stuff */
int dev_num; /* /dev/tpm# */
int num_opens; /* only one allowed */
unsigned long is_open; /* only one allowed */
int time_expired;
/* Data passed to and from the tpm via the read/write calls */
......
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