[openwrt/openwrt] ucode-mod-uline: re-introduce polling loop to fix prompt after line end

[LEDE Commits]

nbd pushed a commit to openwrt/openwrt.git, branch main:
https://git.openwrt.org/0b4ddeed5e27c53e08c797300642c2751e76f300

commit 0b4ddeed5e27c53e08c797300642c2751e76f300
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Wed May 7 17:21:38 2025 +0200

    ucode-mod-uline: re-introduce polling loop to fix prompt after line end
    
    Introduce a check for the resource data in order to avoid segfaulting
    on exit
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/utils/ucode-mod-uline/src/ucode.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/package/utils/ucode-mod-uline/src/ucode.c b/package/utils/ucode-mod-uline/src/ucode.c
index 7d7753a6d8..bf53a636ed 100644
--- a/package/utils/ucode-mod-uline/src/ucode.c
+++ b/package/utils/ucode-mod-uline/src/ucode.c
@@ -368,21 +368,25 @@ uc_uline_cb_event(struct uline_state *s, enum uline_event ev)
 static void uc_uline_poll_cb(struct uloop_fd *fd, unsigned int events)
 {
 	struct uc_uline_state *us = container_of(fd, struct uc_uline_state, fd);
+	uc_value_t *res = ucv_get(us->res);
 	uc_value_t *val;
 
-	uline_poll(&us->s);
+	while (!uloop_cancelled && ucv_resource_data(res, NULL) && us->poll_cb) {
+		uline_poll(&us->s);
 
-	val = us->line;
-	if (!val)
-		return;
+		val = us->line;
+		if (!val)
+			break;
 
-	us->line = NULL;
-	if (!ucv_is_callable(us->poll_cb))
-		return;
+		us->line = NULL;
+		if (!ucv_is_callable(us->poll_cb))
+			break;
 
-	uc_vm_stack_push(us->vm, ucv_get(us->res));
-	uc_vm_stack_push(us->vm, ucv_get(us->poll_cb));
-	cb_call(us, 1, val);
+		uc_vm_stack_push(us->vm, ucv_get(res));
+		uc_vm_stack_push(us->vm, ucv_get(us->poll_cb));
+		cb_call(us, 1, val);
+	}
+	ucv_put(res);
 }
 
 static bool