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Subject[PATCH v2 3/5] mailbox: mailbox-test: Use more consistent format for calling copy_from_user()
Date
While we're at it, ensure copy-to location is NULL'ed in the error path.

Suggested-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
---
drivers/mailbox/mailbox-test.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index dc11bbf..5f4b439 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -46,7 +46,6 @@ static ssize_t mbox_test_signal_write(struct file *filp,
size_t count, loff_t *ppos)
{
struct mbox_test_device *tdev = filp->private_data;
- int ret;

if (!tdev->tx_channel) {
dev_err(tdev->dev, "Channel cannot do Tx\n");
@@ -64,13 +63,13 @@ static ssize_t mbox_test_signal_write(struct file *filp,
if (!tdev->signal)
return -ENOMEM;

- ret = copy_from_user(tdev->signal, userbuf, count);
- if (ret) {
+ if (copy_from_user(tdev->signal, userbuf, count)) {
kfree(tdev->signal);
+ tdev->signal = NULL;
return -EFAULT;
}

- return ret < 0 ? ret : count;
+ return count;
}

static const struct file_operations mbox_test_signal_ops = {
--
1.9.1
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