/* * Copyright IBM Corp. 2001,2008 * * This file contains the IRQ specific code for hvc_console * */ #include #include "hvc_console.h" static irqreturn_t hvc_handle_interrupt(int irq, void *dev_instance) { /* if hvc_poll request a repoll, then kick the hvcd thread */ if (hvc_poll(dev_instance)) hvc_kick(); /* * We're safe to always return IRQ_HANDLED as the hvcd thread will * iterate through each hvc_struct. */ return IRQ_HANDLED; } /* * For IRQ based systems these callbacks can be used */ int notifier_add_irq(struct hvc_struct *hp, int irq) { int rc; if (!irq) { hp->irq_requested = 0; return 0; } rc = request_irq(irq, hvc_handle_interrupt, hp->flags, "hvc_console", hp); if (!rc) hp->irq_requested = 1; return rc; } void notifier_del_irq(struct hvc_struct *hp, int irq) { if (!hp->irq_requested) return; free_irq(irq, hp); hp->irq_requested = 0; } void notifier_hangup_irq(struct hvc_struct *hp, int irq) { notifier_del_irq(hp, irq); } pe='hidden' name='id' value='030305d69fc6963c16003f50d7e8d74b02d0a143'/> net-next plumbingsTobias Klauser
summaryrefslogtreecommitdiff
path: root/include/dt-bindings/reset/stih416-resets.h
diff options
context:
space:
mode:
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 /include/dt-bindings/reset/stih416-resets.h
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 'include/dt-bindings/reset/stih416-resets.h')