Currently, /dev/null discards all writes, but returns -ENOSYS on read.
Implement read to return 0 always, so it returns EOF immediately.
Signed-off-by: Ahmad Fatoum <a.fat...@pengutronix.de>
---
commands/stddev.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/commands/stddev.c b/commands/stddev.c
index e9b7dcc0d2f3..16cf4e30802d 100644
--- a/commands/stddev.c
+++ b/commands/stddev.c
@@ -64,8 +64,14 @@ static ssize_t null_write(struct cdev *cdev, const void
*buf, size_t count, loff
return count;
}
+static ssize_t null_read(struct cdev *cdev, void *buf, size_t count, loff_t
offset, ulong flags)
+{
+ return 0;
+}
+
static struct cdev_operations nullops = {
.write = null_write,
+ .read = null_read,
};
static int null_init(void)
--
2.39.5
