[PATCH 2/3] usb: gadget: f_acm: Allow restarting ACM console after stopping it

[Stephan Gerhold]

When using IOMUX, the "usbacm" console can be added/removed dynamically
from the stdout/stderr/stdin environment variables to allow temporarily
starting other USB gadgets (e.g. Fastboot).

However, right now acm_stdio_stop() does not completely undo
acm_stdio_start(): The USB gadget is unregistered, but as long as dev->priv
stays set acm_stdio_start() will never register the USB gadget again.

Clear dev->priv after we detach to make sure a start operation after a stop
operation registers the gadget again.

Fixes: fc2b399ac03b ("usb: gadget: Add CDC ACM function")
Signed-off-by: Stephan Gerhold <stephan.gerhold at linaro.org>
---
 drivers/usb/gadget/f_acm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index 2665fa4168f99b35a8c595aa24cb3fc4e8ab8529..8f7256069f58527b2e43e5add725a0b5f06baa6d 100644
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -663,6 +663,7 @@ static int acm_stdio_stop(struct stdio_dev *dev)
 {
 	g_dnl_unregister();
 	g_dnl_clear_detach();
+	dev->priv = NULL;
 
 	return 0;
 }

-- 
2.47.2