staging: wfx: fix warning when unregister a frozen device

The device does not answer to the command hif_shutdown. Therefore,
hif_shutdown() is a bit special. It bypasses some of work normally made
by wfx_cmd_send(). In particularly, it unlock hif_cmd.lock and
hif_cmd.key_renew_lock.

However, if the driver notice that the device is frozen, wfx_cmd_send()
stops to send data and doesn't lock the mutexes. Then, it produced a
warning when hif_shutdown() tried to unlock these mutexes.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200515083325.378539-2-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/wfx/hif_tx.c b/drivers/staging/wfx/hif_tx.c
index 7f45971..3e5d911 100644 (file)
--- a/drivers/staging/wfx/hif_tx.c
+++ b/drivers/staging/wfx/hif_tx.c
@@ -131,6 +131,8 @@ int hif_shutdown(struct wfx_dev *wdev)
        int ret;
        struct hif_msg *hif;
 
+       if (wdev->chip_frozen)
+               return 0;
        wfx_alloc_hif(0, &hif);
        wfx_fill_header(hif, -1, HIF_REQ_ID_SHUT_DOWN, 0);
        ret = wfx_cmd_send(wdev, hif, NULL, 0, true);