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gpio: mockup: return -EFAULT if copy_from_user() fails

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copy_from_user() returns the number of bytes remaining to be copied but
we want to return negative error codes on failue.

Fixes: 9202ba2397d1 ("gpio: mockup: implement event injecting over debugfs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Dan Carpenter 2017-02-15 02:02:06 +03:00 committed by Linus Walleij
parent 9ce9f79997
commit fa6256db03
1 changed files with 3 additions and 4 deletions
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7
drivers/gpio/gpio-mockup.c
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@ -197,7 +197,7 @@ static ssize_t gpio_mockup_event_write(struct file *file,
struct seq_file *sfile;
struct gpio_desc *desc;
struct gpio_chip *gc;
int status, val;
int val;
char buf;
sfile = file->private_data;
@ -206,9 +206,8 @@ static ssize_t gpio_mockup_event_write(struct file *file,
chip = priv->chip;
gc = &chip->gc;
status = copy_from_user(&buf, usr_buf, 1);
if (status)
return status;
if (copy_from_user(&buf, usr_buf, 1))
return -EFAULT;
if (buf == '0')
val = 0;