/* * MUSB OTG driver host defines * * Copyright 2005 Mentor Graphics Corporation * Copyright (C) 2005-2006 by Texas Instruments * Copyright (C) 2006-2007 Nokia Corporation * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #ifndef _MUSB_HOST_H #define _MUSB_HOST_H #include /* stored in "usb_host_endpoint.hcpriv" for scheduled endpoints */ struct musb_qh { struct usb_host_endpoint *hep; /* usbcore info */ struct usb_device *dev; struct musb_hw_ep *hw_ep; /* current binding */ struct list_head ring; /* of musb_qh */ /* struct musb_qh *next; */ /* for periodic tree */ u8 mux; /* qh multiplexed to hw_ep */ unsigned offset; /* in urb->transfer_buffer */ unsigned segsize; /* current xfer fragment */ u8 type_reg; /* {rx,tx} type register */ u8 intv_reg; /* {rx,tx} interval register */ u8 addr_reg; /* device address register */ u8 h_addr_reg; /* hub address register */ u8 h_port_reg; /* hub port register */ u8 is_ready; /* safe to modify hw_ep */ u8 type; /* XFERTYPE_* */ u8 epnum; u8 hb_mult; /* high bandwidth pkts per uf */ u16 maxpacket; u16 frame; /* for periodic schedule */ unsigned iso_idx; /* in urb->iso_frame_desc[] */ struct sg_mapping_iter sg_miter; /* for highmem in PIO mode */ bool use_sg; /* to track urb using sglist */ }; /* map from control or bulk queue head to the first qh on that ring */ static inline struct musb_qh *first_qh(struct list_head *q) { if (list_empty(q)) return NULL; return list_entry(q->next, struct musb_qh, ring); } #if IS_ENABLED(CONFIG_USB_MUSB_HOST) || IS_ENABLED(CONFIG_USB_MUSB_DUAL_ROLE) extern struct musb *hcd_to_musb(struct usb_hcd *); extern irqreturn_t musb_h_ep0_irq(struct musb *); extern int musb_host_alloc(struct musb *); extern int musb_host_setup(struct musb *, int); extern void musb_host_cleanup(struct musb *); extern void musb_host_tx(struct musb *, u8); extern void musb_host_rx(struct musb *, u8); extern void musb_root_disconnect(struct musb *musb); extern void musb_host_free(struct musb *); extern void musb_host_cleanup(struct musb *); extern void musb_host_tx(struct musb *, u8); extern void musb_host_rx(struct musb *, u8); extern void musb_root_disconnect(struct musb *musb); extern void musb_host_resume_root_hub(struct musb *musb); extern void musb_host_poke_root_hub(struct musb *musb); extern void musb_port_suspend(struct musb *musb, bool do_suspend); extern void musb_port_reset(struct musb *musb, bool do_reset); extern void musb_host_finish_resume(struct work_struct *work); #else static inline struct musb *hcd_to_musb(struct usb_hcd *hcd) { return NULL; } static inline irqreturn_t musb_h_ep0_irq(struct musb *musb) { return 0; } static inline int musb_host_alloc(struct musb *musb) { return 0; } static inline int musb_host_setup(struct musb *musb, int power_budget) { return 0; } static inline void musb_host_cleanup(struct musb *musb) {} static inline void musb_host_free(struct musb *musb) {} static inline void musb_host_tx(struct musb *musb, u8 epnum) {} static inline void musb_host_rx(struct musb *musb, u8 epnum) {} static inline void musb_root_disconnect(struct musb *musb) {} static inline void musb_host_resume_root_hub(struct musb *musb) {} static inline void musb_host_poll_rh_status(struct musb *musb) {} static inline void musb_host_poke_root_hub(struct musb *musb) {} static inline void musb_port_suspend(struct musb *musb, bool do_suspend) {} static inline void musb_port_reset(struct musb *musb, bool do_reset) {} static inline void musb_host_finish_resume(struct work_struct *work) {} #endif struct usb_hcd; extern int musb_hub_status_data(struct usb_hcd *hcd, char *buf); extern int musb_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex, char *buf, u16 wLength); static inline struct urb *next_urb(struct musb_qh *qh) { struct list_head *queue; if (!qh) return NULL; queue = &qh->hep->urb_list; if (list_empty(queue)) return NULL; return list_entry(queue->next, struct urb, urb_list); } #endif /* _MUSB_HOST_H */ an='2' class='oid'>4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'net/dsa/Kconfig')