From 0dffb4862a5f109dc9b72e3a4e0ecc85a87ce397 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bj=C3=B8rn=20Mork?= Date: Tue, 6 Mar 2012 17:29:20 +0100 Subject: [PATCH] usb: cdc-wdm: split out reusable parts of probe MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Preparing for the addition of subdriver registering as an alternative to probe for interface-less usage. This should not change anything apart from minor code reordering. Signed-off-by: Bjørn Mork Acked-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-wdm.c | 105 ++++++++++++++++++------------------ 1 file changed, 54 insertions(+), 51 deletions(-) diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 6037b503153f..451793036d37 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -631,47 +631,11 @@ static void wdm_rxwork(struct work_struct *work) /* --- hotplug --- */ -static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) +static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, u16 bufsize) { - int rv = -EINVAL; + int rv = -ENOMEM; struct wdm_device *desc; - struct usb_host_interface *iface; - struct usb_endpoint_descriptor *ep; - struct usb_cdc_dmm_desc *dmhd; - u8 *buffer = intf->altsetting->extra; - int buflen = intf->altsetting->extralen; - u16 maxcom = WDM_DEFAULT_BUFSIZE; - - if (!buffer) - goto out; - - while (buflen > 2) { - if (buffer [1] != USB_DT_CS_INTERFACE) { - dev_err(&intf->dev, "skipping garbage\n"); - goto next_desc; - } - - switch (buffer [2]) { - case USB_CDC_HEADER_TYPE: - break; - case USB_CDC_DMM_TYPE: - dmhd = (struct usb_cdc_dmm_desc *)buffer; - maxcom = le16_to_cpu(dmhd->wMaxCommand); - dev_dbg(&intf->dev, - "Finding maximum buffer length: %d", maxcom); - break; - default: - dev_err(&intf->dev, - "Ignoring extra header, type %d, length %d\n", - buffer[2], buffer[0]); - break; - } -next_desc: - buflen -= buffer[0]; - buffer += buffer[0]; - } - rv = -ENOMEM; desc = kzalloc(sizeof(struct wdm_device), GFP_KERNEL); if (!desc) goto out; @@ -679,18 +643,14 @@ next_desc: mutex_init(&desc->wlock); spin_lock_init(&desc->iuspin); init_waitqueue_head(&desc->wait); - desc->wMaxCommand = maxcom; + desc->wMaxCommand = bufsize; /* this will be expanded and needed in hardware endianness */ desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); desc->intf = intf; INIT_WORK(&desc->rxwork, wdm_rxwork); rv = -EINVAL; - iface = intf->cur_altsetting; - if (iface->desc.bNumEndpoints != 1) - goto err; - ep = &iface->endpoint[0].desc; - if (!ep || !usb_endpoint_is_int_in(ep)) + if (!usb_endpoint_is_int_in(ep)) goto err; desc->wMaxPacketSize = usb_endpoint_maxp(ep); @@ -766,13 +726,56 @@ out: err2: usb_set_intfdata(intf, NULL); err: - free_urbs(desc); - kfree(desc->inbuf); - kfree(desc->sbuf); - kfree(desc->ubuf); - kfree(desc->orq); - kfree(desc->irq); - kfree(desc); + cleanup(desc); + return rv; +} + +static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) +{ + int rv = -EINVAL; + struct usb_host_interface *iface; + struct usb_endpoint_descriptor *ep; + struct usb_cdc_dmm_desc *dmhd; + u8 *buffer = intf->altsetting->extra; + int buflen = intf->altsetting->extralen; + u16 maxcom = WDM_DEFAULT_BUFSIZE; + + if (!buffer) + goto err; + while (buflen > 2) { + if (buffer[1] != USB_DT_CS_INTERFACE) { + dev_err(&intf->dev, "skipping garbage\n"); + goto next_desc; + } + + switch (buffer[2]) { + case USB_CDC_HEADER_TYPE: + break; + case USB_CDC_DMM_TYPE: + dmhd = (struct usb_cdc_dmm_desc *)buffer; + maxcom = le16_to_cpu(dmhd->wMaxCommand); + dev_dbg(&intf->dev, + "Finding maximum buffer length: %d", maxcom); + break; + default: + dev_err(&intf->dev, + "Ignoring extra header, type %d, length %d\n", + buffer[2], buffer[0]); + break; + } +next_desc: + buflen -= buffer[0]; + buffer += buffer[0]; + } + + iface = intf->cur_altsetting; + if (iface->desc.bNumEndpoints != 1) + goto err; + ep = &iface->endpoint[0].desc; + + rv = wdm_create(intf, ep, maxcom); + +err: return rv; } -- 2.20.1