[PATCH 2/5] lib: term: ask the terminal when a console can't tell its size

[Ahmad Fatoum <a.fatoum@barebox.org>]

term_cdev_get_size() returns whatever the get_size callback of a
console returns. A console may not always know its size, though: a
virtio console only does once the host has filled it in. Fall back to
querying the terminal when the callback fails, as for consoles without
one.

Signed-off-by: Ahmad Fatoum <a.fatoum@barebox.org>
---
 lib/term.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/term.c b/lib/term.c
index 382250c70ddf..1322546ce8ac 100644
--- a/lib/term.c
+++ b/lib/term.c
@@ -82,8 +82,9 @@ int term_cdev_get_size(struct console_device *cdev,
 	if (!(cdev->f_active & CONSOLE_STDOUT))
 		return -ENOENT;
 
-	if (cdev->get_size)
-		return cdev->get_size(cdev, screenwidth, screenheight);
+	/* ask the terminal only if the console can't tell size */
+	if (cdev->get_size && !cdev->get_size(cdev, screenwidth, screenheight))
+		return 0;
 
 	if (!(cdev->f_active & CONSOLE_STDIN))
 		return -ENOENT;
-- 
2.47.3