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Commit f3c4ef08 authored by Federico Vaga's avatar Federico Vaga
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kernel: save a couple of memcpy in user space 

Signed-off-by: Federico Vaga's avatarFederico Vaga <federico.vaga@cern.ch>
parent ad922622
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Showing with 10 additions and 15 deletions
kernel/wrnc-hmq.c
View file @ f3c4ef08
......@@ -539,7 +539,7 @@ static struct wrnc_msg *wrnc_message_pop(struct wrnc_hmq *hmq)
static int wrnc_ioctl_msg_sync(struct wrnc_hmq *hmq, void __user *uarg)
{
struct wrnc_dev *wrnc = to_wrnc_dev(hmq->dev.parent);
struct wrnc_msg msg_ans;
struct wrnc_msg msg_ans, msg_req;
struct wrnc_msg_sync msg;
struct wrnc_hmq *hmq_out;
unsigned long flags;
......@@ -548,6 +548,9 @@ static int wrnc_ioctl_msg_sync(struct wrnc_hmq *hmq, void __user *uarg)
/* Copy the message from user space*/
err = copy_from_user(&msg, uarg, sizeof(struct wrnc_msg_sync));
if (err)
return err;
err = copy_from_user(&msg_req, msg.msg, sizeof(struct wrnc_msg));
if (err)
return err;
......@@ -569,7 +572,7 @@ static int wrnc_ioctl_msg_sync(struct wrnc_hmq *hmq, void __user *uarg)
/* Send the message */
spin_lock_irqsave(&hmq->lock, flags);
seq = wrnc_message_push(hmq, &msg.msg);
seq = wrnc_message_push(hmq, &msg_req);
spin_unlock_irqrestore(&hmq->lock, flags);
/* Set message sequance to wait */
......@@ -594,15 +597,10 @@ static int wrnc_ioctl_msg_sync(struct wrnc_hmq *hmq, void __user *uarg)
if (to == 0)
dev_err(&hmq->dev,
"The real time application is taking too much time to answer. Something is broken\n");
memset(&msg.msg, 0, sizeof(struct wrnc_msg));
goto out_sync;
memset(&msg_ans, 0, sizeof(struct wrnc_msg));
}
/* Copy the answer message back to user space */
memcpy(&msg.msg, &msg_ans, sizeof(struct wrnc_msg));
out_sync:
return copy_to_user(uarg, &msg, sizeof(struct wrnc_msg_sync));
return copy_to_user(msg.msg, &msg_ans, sizeof(struct wrnc_msg));
}
......@@ -692,7 +690,7 @@ static long wrnc_hmq_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
wrnc_ioctl_msg_filter_clean(user, uarg);
break;
default:
pr_warn("ual: invalid ioctl command %d\n", cmd);
pr_warn("wrnc: invalid ioctl command %d\n", cmd);
return -EINVAL;
}
......
kernel/wrnc-user.h
View file @ f3c4ef08
......@@ -57,7 +57,7 @@ struct wrnc_msg {
* Message descriptor used to send synchronous messages
*/
struct wrnc_msg_sync {
struct wrnc_msg msg; /**< the message to send. It will be overwritten by
struct wrnc_msg *msg; /**< the message to send. It will be overwritten by
the synchronous answer */
uint16_t index_in; /**< where write the message */
uint16_t index_out; /**< where we expect the synchronous answer */
......
lib/libwrnc.c
View file @ f3c4ef08
......@@ -735,16 +735,13 @@ int wrnc_hmq_send_and_receive_sync(struct wrnc_hmq *hmq,
smsg.index_in = hmq->index;
smsg.index_out = index_out;
smsg.timeout_ms = timeout_ms;
memcpy(&smsg.msg, msg, sizeof(struct wrnc_msg));
smsg.msg = msg;
/* Send the message */
err = ioctl(hmq->fd, WRNC_IOCTL_MSG_SYNC, &smsg);
if (err)
return -1;
/* Copy the answer */
memcpy(msg, &smsg.msg, sizeof(struct wrnc_msg));
msg->error = 0;
msg->offset = 0;
msg->direction = WRNC_MSG_DIR_RECEIVE;
......
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