[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>
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@ -61,30 +61,24 @@ static int vmcp_release(struct inode *inode, struct file *file)
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static ssize_t
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vmcp_read(struct file *file, char __user *buff, size_t count, loff_t *ppos)
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{
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size_t tocopy;
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ssize_t ret;
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size_t size;
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struct vmcp_session *session;
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session = (struct vmcp_session *)file->private_data;
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session = file->private_data;
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if (mutex_lock_interruptible(&session->mutex))
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return -ERESTARTSYS;
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if (!session->response) {
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mutex_unlock(&session->mutex);
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return 0;
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}
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if (*ppos > session->resp_size) {
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mutex_unlock(&session->mutex);
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return 0;
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}
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tocopy = min(session->resp_size - (size_t) (*ppos), count);
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tocopy = min(tocopy, session->bufsize - (size_t) (*ppos));
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size = min_t(size_t, session->resp_size, session->bufsize);
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ret = simple_read_from_buffer(buff, count, ppos,
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session->response, size);
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if (copy_to_user(buff, session->response + (*ppos), tocopy)) {
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mutex_unlock(&session->mutex);
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return -EFAULT;
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}
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mutex_unlock(&session->mutex);
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*ppos += tocopy;
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return tocopy;
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return ret;
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}
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static ssize_t
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