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[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>
This commit is contained in:
Akinobu Mita 2008-07-14 09:59:14 +02:00 committed by Heiko Carstens
parent 3ca1c9907a
commit 7785857a5a
1 changed files with 8 additions and 14 deletions
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22
drivers/s390/char/vmcp.c
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@ -61,30 +61,24 @@ static int vmcp_release(struct inode *inode, struct file *file)
static ssize_t static ssize_t
vmcp_read(struct file *file, char __user *buff, size_t count, loff_t *ppos) 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; struct vmcp_session *session;
session = (struct vmcp_session *)file->private_data; session = file->private_data;
if (mutex_lock_interruptible(&session->mutex)) if (mutex_lock_interruptible(&session->mutex))
return -ERESTARTSYS; return -ERESTARTSYS;
if (!session->response) { if (!session->response) {
mutex_unlock(&session->mutex); mutex_unlock(&session->mutex);
return 0; return 0;
} }
if (*ppos > session->resp_size) { size = min_t(size_t, session->resp_size, session->bufsize);
mutex_unlock(&session->mutex); ret = simple_read_from_buffer(buff, count, ppos,
return 0; session->response, size);
}
tocopy = min(session->resp_size - (size_t) (*ppos), count);
tocopy = min(tocopy, session->bufsize - (size_t) (*ppos));
if (copy_to_user(buff, session->response + (*ppos), tocopy)) {
mutex_unlock(&session->mutex); mutex_unlock(&session->mutex);
return -EFAULT;
} return ret;
mutex_unlock(&session->mutex);
*ppos += tocopy;
return tocopy;
} }
static ssize_t static ssize_t