/* * Copyright (c) by Lee Revell * Clemens Ladisch * Routines for control of EMU10K1 chips * * BUGS: * -- * * TODO: * -- * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include #include #include static int snd_emu10k1_timer_start(struct snd_timer *timer) { struct snd_emu10k1 *emu; unsigned long flags; unsigned int delay; emu = snd_timer_chip(timer); delay = timer->sticks - 1; if (delay < 5 ) /* minimum time is 5 ticks */ delay = 5; spin_lock_irqsave(&emu->reg_lock, flags); snd_emu10k1_intr_enable(emu, INTE_INTERVALTIMERENB); outw(delay & TIMER_RATE_MASK, emu->port + TIMER); spin_unlock_irqrestore(&emu->reg_lock, flags); return 0; } static int snd_emu10k1_timer_stop(struct snd_timer *timer) { struct snd_emu10k1 *emu; unsigned long flags; emu = snd_timer_chip(timer); spin_lock_irqsave(&emu->reg_lock, flags); snd_emu10k1_intr_disable(emu, INTE_INTERVALTIMERENB); spin_unlock_irqrestore(&emu->reg_lock, flags); return 0; } static int snd_emu10k1_timer_precise_resolution(struct snd_timer *timer, unsigned long *num, unsigned long *den) { *num = 1; *den = 48000; return 0; } static struct snd_timer_hardware snd_emu10k1_timer_hw = { .flags = SNDRV_TIMER_HW_AUTO, .resolution = 20833, /* 1 sample @ 48KHZ = 20.833...us */ .ticks = 1024, .start = snd_emu10k1_timer_start, .stop = snd_emu10k1_timer_stop, .precise_resolution = snd_emu10k1_timer_precise_resolution, }; int snd_emu10k1_timer(struct snd_emu10k1 *emu, int device) { struct snd_timer *timer = NULL; struct snd_timer_id tid; int err; tid.dev_class = SNDRV_TIMER_CLASS_CARD; tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; tid.card = emu->card->number; tid.device = device; tid.subdevice = 0; if ((err = snd_timer_new(emu->card, "EMU10K1", &tid, &timer)) >= 0) { strcpy(timer->name, "EMU10K1 timer"); timer->private_data = emu; timer->hw = snd_emu10k1_timer_hw; } emu->timer = timer; return err; } nge
path: root/include/drm/drm_atomic.h
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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 /include/drm/drm_atomic.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/drm/drm_atomic.h')