#undef TRACE_SYSTEM #define TRACE_SYSTEM raw_syscalls #define TRACE_INCLUDE_FILE syscalls #if !defined(_TRACE_EVENTS_SYSCALLS_H) || defined(TRACE_HEADER_MULTI_READ) #define _TRACE_EVENTS_SYSCALLS_H #include #include #include #ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS TRACE_EVENT_FN(sys_enter, TP_PROTO(struct pt_regs *regs, long id), TP_ARGS(regs, id), TP_STRUCT__entry( __field( long, id ) __array( unsigned long, args, 6 ) ), TP_fast_assign( __entry->id = id; syscall_get_arguments(current, regs, 0, 6, __entry->args); ), TP_printk("NR %ld (%lx, %lx, %lx, %lx, %lx, %lx)", __entry->id, __entry->args[0], __entry->args[1], __entry->args[2], __entry->args[3], __entry->args[4], __entry->args[5]), syscall_regfunc, syscall_unregfunc ); TRACE_EVENT_FLAGS(sys_enter, TRACE_EVENT_FL_CAP_ANY) TRACE_EVENT_FN(sys_exit, TP_PROTO(struct pt_regs *regs, long ret), TP_ARGS(regs, ret), TP_STRUCT__entry( __field( long, id ) __field( long, ret ) ), TP_fast_assign( __entry->id = syscall_get_nr(current, regs); __entry->ret = ret; ), TP_printk("NR %ld = %ld", __entry->id, __entry->ret), syscall_regfunc, syscall_unregfunc ); TRACE_EVENT_FLAGS(sys_exit, TRACE_EVENT_FL_CAP_ANY) #endif /* CONFIG_HAVE_SYSCALL_TRACEPOINTS */ #endif /* _TRACE_EVENTS_SYSCALLS_H */ /* This part must be outside protection */ #include b right'>Tobias Klauser
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authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /drivers/usb/dwc3
parent4d191b1b63c209e37bf27938ef365244d3c41084 (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 'drivers/usb/dwc3')