On Tuesday, August 24, 2021 5:26:23 PM CEST Pavel Skripkin wrote:

I found the problem:

quoted

 	mutex_lock(&dvobjpriv->usb_vendor_req_mutex);
 
 	/*  Acquire IO memory for vendorreq */
-	pIo_buf = dvobjpriv->usb_vendor_req_buf;
+	io_buf = dvobjpriv->usb_vendor_req_buf;

I don't know from where mutex_lock() comes from. In staging-next I have

_enter_critical_mutex(&dvobjpriv->usb_vendor_req_mutex, NULL);

instead of

mutex_lock(&dvobjpriv->usb_vendor_req_mutex);

Oh, I know where it comes from... :)

It's a patch of mine that is in the queue, waiting to be reviewed and applied.
Please see: https://lore.kernel.org/lkml/20210819221241.31987-1-fmdefrancesco@gmail.com/ (local)

Thanks,

Fabio

With regards,
Pavel Skripkin