ath9k_htc: reboot firmware if it was loaded

commit 4928bd2ef8ece262f4f314630219999a91eaa440 upstream.

Currently ath9k_htc will reboot firmware only if interface was
ever started. Which lead to the problem in case where interface
was never started but module need to be reloaded.

This patch will partially fix bug "ath9k_htc: Target is unresponsive"
https://github.com/qca/open-ath9k-htc-firmware/issues/1

Reproduction case:
- plug adapter
- make sure nothing will touch it. Stop Networkmanager or blacklist mac address of this adapter.
- rmmod ath9k_htc; sleep 1; modprobe ath9k_htc

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index f5dda84176c3d4ae8277c069df06fa3bbc11922d..75a6376ed2897caa567934712af9f23e2e4a6c55 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -1289,7 +1289,9 @@ static void ath9k_hif_usb_disconnect(struct usb_interface *interface)
 
        usb_set_intfdata(interface, NULL);
 
-       if (!unplugged && (hif_dev->flags & HIF_USB_START))
+       /* If firmware was loaded we should drop it
+        * go back to first stage bootloader. */
+       if (!unplugged && (hif_dev->flags & HIF_USB_READY))
                ath9k_hif_usb_reboot(udev);
 
        kfree(hif_dev);