linux-kernel - [PATCH 3.16 067/132] cdc-acm: store in and out pipes in acm structure

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Message-ID: <lsq.1568989415.572119509@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Ladislav Michl" <ladis@...ux-mips.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Oliver Neukum" <oneukum@...e.com>
Subject: [PATCH 3.16 067/132] cdc-acm: store in and out pipes in acm structure

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ladislav Michl <ladis@...ux-mips.org>

commit 74bccc9b71dc41d37e73fcdbcbec85310a670751 upstream.

Clearing stall needs pipe descriptor, store it in acm structure.

Signed-off-by: Ladislav Michl <ladis@...ux-mips.org>
Acked-by: Oliver Neukum <oneukum@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/class/cdc-acm.c | 33 +++++++++++++++++----------------
 drivers/usb/class/cdc-acm.h |  1 +
 2 files changed, 18 insertions(+), 16 deletions(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1355,8 +1355,16 @@ made_compressed_probe:
 	spin_lock_init(&acm->read_lock);
 	mutex_init(&acm->mutex);
 	acm->is_int_ep = usb_endpoint_xfer_int(epread);
-	if (acm->is_int_ep)
+	if (acm->is_int_ep) {
 		acm->bInterval = epread->bInterval;
+		acm->in = usb_rcvintpipe(usb_dev, epread->bEndpointAddress);
+	} else {
+		acm->in = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
+	}
+	if (usb_endpoint_xfer_int(epwrite))
+		acm->out = usb_sndintpipe(usb_dev, epwrite->bEndpointAddress);
+	else
+		acm->out = usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress);
 	tty_port_init(&acm->port);
 	acm->port.ops = &acm_port_ops;
 	init_usb_anchor(&acm->delayed);
@@ -1401,20 +1409,15 @@ made_compressed_probe:
 		}
 		urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 		urb->transfer_dma = rb->dma;
-		if (acm->is_int_ep) {
-			usb_fill_int_urb(urb, acm->dev,
-					 usb_rcvintpipe(usb_dev, epread->bEndpointAddress),
-					 rb->base,
+		if (acm->is_int_ep)
+			usb_fill_int_urb(urb, acm->dev, acm->in, rb->base,
 					 acm->readsize,
 					 acm_read_bulk_callback, rb,
 					 acm->bInterval);
-		} else {
-			usb_fill_bulk_urb(urb, acm->dev,
-					  usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress),
-					  rb->base,
+		else
+			usb_fill_bulk_urb(urb, acm->dev, acm->in, rb->base,
 					  acm->readsize,
 					  acm_read_bulk_callback, rb);
-		}
 
 		acm->read_urbs[i] = urb;
 		__set_bit(i, &acm->read_urbs_free);
@@ -1430,12 +1433,10 @@ made_compressed_probe:
 		}
 
 		if (usb_endpoint_xfer_int(epwrite))
-			usb_fill_int_urb(snd->urb, usb_dev,
-				usb_sndintpipe(usb_dev, epwrite->bEndpointAddress),
+			usb_fill_int_urb(snd->urb, usb_dev, acm->out,
 				NULL, acm->writesize, acm_write_bulk, snd, epwrite->bInterval);
 		else
-			usb_fill_bulk_urb(snd->urb, usb_dev,
-				usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress),
+			usb_fill_bulk_urb(snd->urb, usb_dev, acm->out,
 				NULL, acm->writesize, acm_write_bulk, snd);
 		snd->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 		if (quirks & SEND_ZERO_PACKET)
@@ -1504,8 +1505,8 @@ skip_countries:
 	}
 
 	if (quirks & CLEAR_HALT_CONDITIONS) {
-		usb_clear_halt(usb_dev, usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress));
-		usb_clear_halt(usb_dev, usb_sndbulkpipe(usb_dev, epwrite->bEndpointAddress));
+		usb_clear_halt(usb_dev, acm->in);
+		usb_clear_halt(usb_dev, acm->out);
 	}
 
 	return 0;
--- a/drivers/usb/class/cdc-acm.h
+++ b/drivers/usb/class/cdc-acm.h
@@ -83,6 +83,7 @@ struct acm {
 	struct usb_device *dev;				/* the corresponding usb device */
 	struct usb_interface *control;			/* control interface */
 	struct usb_interface *data;			/* data interface */
+	unsigned in, out;				/* i/o pipes */
 	struct tty_port port;			 	/* our tty port data */
 	struct urb *ctrlurb;				/* urbs */
 	u8 *ctrl_buffer;				/* buffers of urbs */