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-rw-r--r--arch/um/drivers/mmapper_kern.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
index 6bc73f0e8e29..7e0619c2c2c6 100644
--- a/arch/um/drivers/mmapper_kern.c
+++ b/arch/um/drivers/mmapper_kern.c
@@ -37,13 +37,7 @@ static ssize_t mmapper_write(struct file *file, const char __user *buf,
if (*ppos > mmapper_size)
return -EINVAL;
- if (count > mmapper_size - *ppos)
- count = mmapper_size - *ppos;
-
- if (copy_from_user(&v_buf[*ppos], buf, count))
- return -EFAULT;
-
- return count;
+ return simple_write_to_buffer(v_buf, mmapper_size, ppos, buf, count);
}
static long mmapper_ioctl(struct file *file, unsigned int cmd, unsigned long arg)