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| author |   Akinobu Mita <akinobu.mita@gmail.com> | 2008-07-14 09:59:14 +0200 |
|---|---|---|
| committer |   Heiko Carstens <heiko.carstens@de.ibm.com> | 2008-07-14 10:02:15 +0200 |
| commit | 7785857a5a4f3e2093ced12568744a205e164d59 (patch) | |
| tree | a7da5d2afb703f0465e2736de14cae4118b29a62 /drivers/s390/char/vmcp.c | |
| parent | [S390] drivers/s390: Eliminate NULL test and memset after alloc_bootmem (diff) | |
| download | wireguard-linux-7785857a5a4f3e2093ced12568744a205e164d59.tar.xz wireguard-linux-7785857a5a4f3e2093ced12568744a205e164d59.zip | |
[S390] s390/vmcp: use simple_read_from_buffer()
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/char/vmcp.c')
| -rw-r--r-- | drivers/s390/char/vmcp.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c index 2f419b0ea628..af616aeaa938 100644 --- a/drivers/s390/char/vmcp.c +++ b/drivers/s390/char/vmcp.c @@ -61,30 +61,24 @@ static int vmcp_release(struct inode *inode, struct file *file) static ssize_t vmcp_read(struct file *file, char __user *buff, size_t count, loff_t *ppos) { - size_t tocopy; + ssize_t ret; + size_t size; struct vmcp_session *session; - session = (struct vmcp_session *)file->private_data; + session = file->private_data; if (mutex_lock_interruptible(&session->mutex)) return -ERESTARTSYS; if (!session->response) { mutex_unlock(&session->mutex); return 0; } - if (*ppos > session->resp_size) { - mutex_unlock(&session->mutex); - return 0; - } - tocopy = min(session->resp_size - (size_t) (*ppos), count); - tocopy = min(tocopy, session->bufsize - (size_t) (*ppos)); + size = min_t(size_t, session->resp_size, session->bufsize); + ret = simple_read_from_buffer(buff, count, ppos, + session->response, size); - if (copy_to_user(buff, session->response + (*ppos), tocopy)) { - mutex_unlock(&session->mutex); - return -EFAULT; - } mutex_unlock(&session->mutex); - *ppos += tocopy; - return tocopy; + + return ret; } static ssize_t |