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USB: usblcd: refactor endpoint retrieval 

Use the new endpoint helpers to lookup the required bulk-in and bulk-out
endpoints.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-03-17 11:35:43 +01:00 committed by Greg Kroah-Hartman
parent 9b181166f1
commit aac96ef9ed
1 changed files with 18 additions and 29 deletions
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45
drivers/usb/misc/usblcd.c
View File

@ -313,16 +313,15 @@ static int lcd_probe(struct usb_interface *interface,
const struct usb_device_id *id)
{
struct usb_lcd *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor *endpoint;
size_t buffer_size;
struct usb_endpoint_descriptor *bulk_in, *bulk_out;
int i;
int retval = -ENOMEM;
int retval;
/* allocate memory for our device state and initialize it */
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
goto error;
return -ENOMEM;
kref_init(&dev->kref);
sema_init(&dev->limit_sem, USB_LCD_CONCURRENT_WRITES);
init_usb_anchor(&dev->submitted);
@ -338,33 +337,24 @@ static int lcd_probe(struct usb_interface *interface,
/* set up the endpoint information */
/* use only the first bulk-in and bulk-out endpoints */
iface_desc = interface->cur_altsetting;
for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
endpoint = &iface_desc->endpoint[i].desc;
if (!dev->bulk_in_endpointAddr &&
usb_endpoint_is_bulk_in(endpoint)) {
/* we found a bulk in endpoint */
buffer_size = usb_endpoint_maxp(endpoint);
dev->bulk_in_size = buffer_size;
dev->bulk_in_endpointAddr = endpoint->bEndpointAddress;
dev->bulk_in_buffer = kmalloc(buffer_size, GFP_KERNEL);
if (!dev->bulk_in_buffer)
goto error;
}
if (!dev->bulk_out_endpointAddr &&
usb_endpoint_is_bulk_out(endpoint)) {
/* we found a bulk out endpoint */
dev->bulk_out_endpointAddr = endpoint->bEndpointAddress;
}
}
if (!(dev->bulk_in_endpointAddr && dev->bulk_out_endpointAddr)) {
retval = usb_find_common_endpoints(interface->cur_altsetting,
&bulk_in, &bulk_out, NULL, NULL);
if (retval) {
dev_err(&interface->dev,
"Could not find both bulk-in and bulk-out endpoints\n");
goto error;
}
dev->bulk_in_size = usb_endpoint_maxp(bulk_in);
dev->bulk_in_endpointAddr = bulk_in->bEndpointAddress;
dev->bulk_in_buffer = kmalloc(dev->bulk_in_size, GFP_KERNEL);
if (!dev->bulk_in_buffer) {
retval = -ENOMEM;
goto error;
}
dev->bulk_out_endpointAddr = bulk_out->bEndpointAddress;
/* save our data pointer in this interface device */
usb_set_intfdata(interface, dev);
@ -390,7 +380,6 @@ static int lcd_probe(struct usb_interface *interface,
return 0;
error:
if (dev)
kref_put(&dev->kref, lcd_delete);
return retval;
}