[PATCH v3] usb: gadget: fastboot: detach usb just before rebooting

[Dario Binacchi]

The patch fixes the following error when updating a BSH SMM S2 board:
3:72>Start Cmd:FB[-t 8000]: ucmd nand write ${loadaddr} nanddtb ${filesize}
3:72>Okay (0.023s)
3:72>Start Cmd:FB: reboot
3:72>Fail Bulk(R):LIBUSB_ERROR_IO(0s)

The "fastboot reboot" command detaches the USB when it still needs to be
used. So let's detach the USB just before the reset.

CC: Mattijs Korpershoek <mkorpershoek at baylibre.com>
Fixes: 5f7e01e9d5d800 ("usb: gadget: fastboot: detach usb on reboot commands")
Suggested-by: Michael Trimarchi <michael at amarulasolutions.com>
Co-developed-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
Signed-off-by: Mattijs Korpershoek <mkorpershoek at baylibre.com>
Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>

---

Changes in v3:
- Replace do_exit_on_complete() with g_dnl_unregister().
- Add 'Co-developed-by' tag.

Changes in v2:
- Add 'Suggested-by' tag.

 drivers/usb/gadget/f_fastboot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
index 07b1681c8a9a..f4311328a2da 100644
--- a/drivers/usb/gadget/f_fastboot.c
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -421,6 +421,7 @@ static int fastboot_tx_write_str(const char *buffer)
 
 static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
 {
+	g_dnl_unregister();
 	do_reset(NULL, 0, 0, NULL);
 }
 
@@ -544,7 +545,6 @@ static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
 		case FASTBOOT_COMMAND_REBOOT_FASTBOOTD:
 		case FASTBOOT_COMMAND_REBOOT_RECOVERY:
 			fastboot_func->in_req->complete = compl_do_reset;
-			g_dnl_trigger_detach();
 			break;
 #if CONFIG_IS_ENABLED(FASTBOOT_UUU_SUPPORT)
 		case FASTBOOT_COMMAND_ACMD:
-- 
2.32.0