linux-kernel - Re: PROBLEM: USB ACM device does not work

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Date:	Wed, 1 Jul 2009 15:24:55 +0400
From:	Arseniy Lartsev <ars3n@...dex.ru>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	USB list <linux-usb@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: USB ACM device does not work

On Wednesday 01 July 2009 14:56:46 Oliver Neukum wrote:
> > +		ep = (usb_pipein(acm->rx_endpoint) ? acm->dev->ep_in :
> > acm->dev->ep_out) +				[usb_pipeendpoint(acm->rx_endpoint)];
> > +		if (usb_endpoint_xfer_int(&ep->desc))
> > +			usb_fill_int_urb(rcv->urb, acm->dev,
> > +					 acm->rx_endpoint,
> > +					 buf->base,
> > +					 acm->readsize,
> > +					 acm_read_bulk, rcv, 0xff);
>
> The patch is good except for this.
> We should make sure this interval matches usbcore's value.
> Would you care to redo it with that change?

Am I right that 0xff here should be changed to ep->desc.bInterval (and to 
epwrite->bInterval in the other call to usb_fill_int_urb)?

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -387,6 +387,7 @@ static void acm_rx_tasklet(unsigned long
 	struct acm_ru *rcv;
 	unsigned long flags;
 	unsigned char throttled;
+	struct usb_host_endpoint *ep;
 
 	dbg("Entering acm_rx_tasklet");
 
@@ -462,11 +463,20 @@ urbs:
 
 		rcv->buffer = buf;
 
-		usb_fill_bulk_urb(rcv->urb, acm->dev,
-				  acm->rx_endpoint,
-				  buf->base,
-				  acm->readsize,
-				  acm_read_bulk, rcv);
+		ep = (usb_pipein(acm->rx_endpoint) ? acm->dev->ep_in : acm->dev->ep_out)
+				[usb_pipeendpoint(acm->rx_endpoint)];
+		if (usb_endpoint_xfer_int(&ep->desc))
+			usb_fill_int_urb(rcv->urb, acm->dev,
+					 acm->rx_endpoint,
+					 buf->base,
+					 acm->readsize,
+					 acm_read_bulk, rcv, ep->desc.bInterval);
+		else
+			usb_fill_bulk_urb(rcv->urb, acm->dev,
+					  acm->rx_endpoint,
+					  buf->base,
+					  acm->readsize,
+					  acm_read_bulk, rcv);
 		rcv->urb->transfer_dma = buf->dma;
 		rcv->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 
@@ -1227,9 +1237,14 @@ made_compressed_probe:
 			goto alloc_fail7;
 		}
 
-		usb_fill_bulk_urb(snd->urb, usb_dev,
-			usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
-			NULL, acm->writesize, acm_write_bulk, snd);
+		if (usb_endpoint_xfer_int(epwrite))
+			usb_fill_int_urb(snd->urb, usb_dev,
+				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
+				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
+		else
+			usb_fill_bulk_urb(snd->urb, usb_dev,
+				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
+				NULL, acm->writesize, acm_write_bulk, snd);
 		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 		snd->instance = acm;
 	}


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