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7fcf9053b9
- Do not perform desctruction on report updatea in EP because 'unregister_device' may block on Led state 'update' (synchronous control message) leading to the driver being stuck because no more signals are received - Check if device is present in 'submit_urb' calls fixes #4166
130 lines
2.7 KiB
C
130 lines
2.7 KiB
C
/*
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* \brief Implementation of linux/usb.h
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* \author Stefan Kalkowski
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* \date 2018-08-25
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*/
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/*
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* Copyright (C) 2018 Genode Labs GmbH
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*
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* This file is distributed under the terms of the GNU General Public License
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* version 2.
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*/
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/* Linux kit includes */
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#include <lx_kit/usb.h>
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int usb_control_msg(struct usb_device *dev, unsigned int pipe,
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__u8 request, __u8 requesttype, __u16 value,
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__u16 index, void *data, __u16 size, int timeout)
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{
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usb_ctrlrequest *dr = (usb_ctrlrequest*)
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kmalloc(sizeof(usb_ctrlrequest), GFP_KERNEL);
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if (!dr) return -ENOMEM;
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dr->bRequestType = requesttype;
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dr->bRequest = request;
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dr->wValue = cpu_to_le16(value);
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dr->wIndex = cpu_to_le16(index);
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dr->wLength = cpu_to_le16(size);
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urb * u = (urb*) usb_alloc_urb(0, GFP_KERNEL);
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if (!u) {
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kfree(dr);
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return -ENOMEM;
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}
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Sync_ctrl_urb * scu = (Sync_ctrl_urb *)kzalloc(sizeof(Sync_ctrl_urb), GFP_KERNEL);
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if (!scu) {
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usb_free_urb(u);
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kfree(dr);
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return -ENOMEM;
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}
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usb_fill_control_urb(u, dev, pipe, (unsigned char *)dr, data,
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size, nullptr, nullptr);
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if (!dev->bus || !dev->bus->controller) {
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kfree(scu);
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usb_free_urb(u);
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kfree(dr);
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return -ENODEV;
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}
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Genode::construct_at<Sync_ctrl_urb>(scu, *(Usb::Connection*)(dev->bus->controller), *u);
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scu->send(timeout);
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kfree(scu);
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int ret;
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if (u->status >= 0)
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ret = u->actual_length;
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else
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ret = u->status;
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usb_free_urb(u);
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kfree(dr);
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return ret;
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}
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struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags)
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{
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struct urb *urb = (struct urb*)
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kmalloc(sizeof(struct urb) +
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iso_packets * sizeof(struct usb_iso_packet_descriptor),
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GFP_KERNEL);
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if (!urb) return NULL;
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Genode::memset(urb, 0, sizeof(*urb));
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INIT_LIST_HEAD(&urb->anchor_list);
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return urb;
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}
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int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
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{
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if (!urb->dev->bus || !urb->dev->bus->controller)
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return -ENODEV;
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Urb * u = (Urb *)kzalloc(sizeof(Urb), mem_flags);
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if (!u)
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return 1;
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Genode::construct_at<Urb>(u, *(Usb::Connection*)(urb->dev->bus->controller), *urb);
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/*
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* Self-destruction of the 'Urb' object in its completion function
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* would not work if the 'Usb' session gets closed before the
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* completion function was called. So we store the pointer in the
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* otherwise unused 'hcpriv' member and free it in a following
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* 'usb_submit_urb()' or 'usb_free_urb()' call.
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*/
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if (urb->hcpriv) {
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Urb *prev_urb = (Urb*)urb->hcpriv;
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prev_urb->~Urb();
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kfree(urb->hcpriv);
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}
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urb->hcpriv = u;
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u->send();
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return 0;
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}
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void usb_free_urb(struct urb *urb)
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{
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if (!urb)
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return;
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/* free 'Urb' object */
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if (urb->hcpriv) {
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Urb *u = (Urb*)urb->hcpriv;
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u->~Urb();
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kfree(urb->hcpriv);
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}
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kfree(urb);
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}
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