diff options
| author | Kylene Hall <kjhall@us.ibm.com> | 2005-06-23 22:01:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-24 00:05:25 -0700 |
| commit | 5b44bd58063f7839f42a4047843e93e1fbf73cda (patch) | |
| tree | 4973ce84fd225eec4333507f62192e3a5b8b4edd /drivers/char/tpm | |
| parent | f87ea32ae2a986acc5258ad736ab0b55937c9489 (diff) | |
| download | linux-5b44bd58063f7839f42a4047843e93e1fbf73cda.tar.bz2 | |
[PATCH] tpm: read return code issue
Replace an erroneous return code for the read function when no data is
available.
Signed-of-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/tpm')
| -rw-r--r-- | drivers/char/tpm/tpm.c | 30 |
1 files changed, 10 insertions, 20 deletions
diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index ff170963c641..7b1f67d9f301 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -489,29 +489,19 @@ ssize_t tpm_read(struct file * file, char __user * buf, size_t size, loff_t * off) { struct tpm_chip *chip = file->private_data; - int ret_size = -ENODATA; + int ret_size; - if (atomic_read(&chip->data_pending) != 0) { /* Result available */ - down(&chip->timer_manipulation_mutex); - del_singleshot_timer_sync(&chip->user_read_timer); - up(&chip->timer_manipulation_mutex); + del_singleshot_timer_sync(&chip->user_read_timer); + ret_size = atomic_read(&chip->data_pending); + atomic_set(&chip->data_pending, 0); + if (ret_size > 0) { /* relay data */ + if (size < ret_size) + ret_size = size; down(&chip->buffer_mutex); - - ret_size = atomic_read(&chip->data_pending); - atomic_set(&chip->data_pending, 0); - - if (ret_size == 0) /* timeout just occurred */ - ret_size = -ETIME; - else if (ret_size > 0) { /* relay data */ - if (size < ret_size) - ret_size = size; - - if (copy_to_user((void __user *) buf, - chip->data_buffer, ret_size)) { - ret_size = -EFAULT; - } - } + if (copy_to_user + ((void __user *) buf, chip->data_buffer, ret_size)) + ret_size = -EFAULT; up(&chip->buffer_mutex); } |