/* * digi00x-hwdep.c - a part of driver for Digidesign Digi 002/003 family * * Copyright (c) 2014-2015 Takashi Sakamoto * * Licensed under the terms of the GNU General Public License, version 2. */ /* * This codes give three functionality. * * 1.get firewire node information * 2.get notification about starting/stopping stream * 3.lock/unlock stream * 4.get asynchronous messaging */ #include "digi00x.h" static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count, loff_t *offset) { struct snd_dg00x *dg00x = hwdep->private_data; DEFINE_WAIT(wait); union snd_firewire_event event; spin_lock_irq(&dg00x->lock); while (!dg00x->dev_lock_changed && dg00x->msg == 0) { prepare_to_wait(&dg00x->hwdep_wait, &wait, TASK_INTERRUPTIBLE); spin_unlock_irq(&dg00x->lock); schedule(); finish_wait(&dg00x->hwdep_wait, &wait); if (signal_pending(current)) return -ERESTARTSYS; spin_lock_irq(&dg00x->lock); } memset(&event, 0, sizeof(event)); if (dg00x->dev_lock_changed) { event.lock_status.type = SNDRV_FIREWIRE_EVENT_LOCK_STATUS; event.lock_status.status = (dg00x->dev_lock_count > 0); dg00x->dev_lock_changed = false; count = min_t(long, count, sizeof(event.lock_status)); } else { event.digi00x_message.type = SNDRV_FIREWIRE_EVENT_DIGI00X_MESSAGE; event.digi00x_message.message = dg00x->msg; dg00x->msg = 0; count = min_t(long, count, sizeof(event.digi00x_message)); } spin_unlock_irq(&dg00x->lock); if (copy_to_user(buf, &event, count)) return -EFAULT; return count; } static unsigned int hwdep_poll(struct snd_hwdep *hwdep, struct file *file, poll_table *wait) { struct snd_dg00x *dg00x = hwdep->private_data; unsigned int events; poll_wait(file, &dg00x->hwdep_wait, wait); spin_lock_irq(&dg00x->lock); if (dg00x->dev_lock_changed || dg00x->msg) events = POLLIN | POLLRDNORM; else events = 0; spin_unlock_irq(&dg00x->lock); return events; } static int hwdep_get_info(struct snd_dg00x *dg00x, void __user *arg) { struct fw_device *dev = fw_parent_device(dg00x->unit); struct snd_firewire_get_info info; memset(&info, 0, sizeof(info)); info.type = SNDRV_FIREWIRE_TYPE_DIGI00X; info.card = dev->card->index; *(__be32 *)&info.guid[0] = cpu_to_be32(dev->config_rom[3]); *(__be32 *)&info.guid[4] = cpu_to_be32(dev->config_rom[4]); strlcpy(info.device_name, dev_name(&dev->device), sizeof(info.device_name)); if (copy_to_user(arg, &info, sizeof(info))) return -EFAULT; return 0; } static int hwdep_lock(struct snd_dg00x *dg00x) { int err; spin_lock_irq(&dg00x->lock); if (dg00x->dev_lock_count == 0) { dg00x->dev_lock_count = -1; err = 0; } else { err = -EBUSY; } spin_unlock_irq(&dg00x->lock); return err; } static int hwdep_unlock(struct snd_dg00x *dg00x) { int err; spin_lock_irq(&dg00x->lock); if (dg00x->dev_lock_count == -1) { dg00x->dev_lock_count = 0; err = 0; } else { err = -EBADFD; } spin_unlock_irq(&dg00x->lock); return err; } static int hwdep_release(struct snd_hwdep *hwdep, struct file *file) { struct snd_dg00x *dg00x = hwdep->private_data; spin_lock_irq(&dg00x->lock); if (dg00x->dev_lock_count == -1) dg00x->dev_lock_count = 0; spin_unlock_irq(&dg00x->lock); return 0; } static int hwdep_ioctl(struct snd_hwdep *hwdep, struct file *file, unsigned int cmd, unsigned long arg) { struct snd_dg00x *dg00x = hwdep->private_data; switch (cmd) { case SNDRV_FIREWIRE_IOCTL_GET_INFO: return hwdep_get_info(dg00x, (void __user *)arg); case SNDRV_FIREWIRE_IOCTL_LOCK: return hwdep_lock(dg00x); case SNDRV_FIREWIRE_IOCTL_UNLOCK: return hwdep_unlock(dg00x); default: return -ENOIOCTLCMD; } } #ifdef CONFIG_COMPAT static int hwdep_compat_ioctl(struct snd_hwdep *hwdep, struct file *file, unsigned int cmd, unsigned long arg) { return hwdep_ioctl(hwdep, file, cmd, (unsigned long)compat_ptr(arg)); } #else #define hwdep_compat_ioctl NULL #endif static const struct snd_hwdep_ops hwdep_ops = { .read = hwdep_read, .release = hwdep_release, .poll = hwdep_poll, .ioctl = hwdep_ioctl, .ioctl_compat = hwdep_compat_ioctl, }; int snd_dg00x_create_hwdep_device(struct snd_dg00x *dg00x) { struct snd_hwdep *hwdep; int err; err = snd_hwdep_new(dg00x->card, "Digi00x", 0, &hwdep); if (err < 0) return err; strcpy(hwdep->name, "Digi00x"); hwdep->iface = SNDRV_HWDEP_IFACE_FW_DIGI00X; hwdep->ops = hwdep_ops; hwdep->private_data = dg00x; hwdep->exclusive = true; return err; } ass='commit-info'> authorChristoph Hellwig <hch@lst.de>2017-01-30 13:15:41 +0100 committerBjorn Helgaas <bhelgaas@google.com>2017-02-02 10:35:46 -0600 commitdfef358bd1beb4e7b5c94eca944be9cd23dfc752 (patch) treeb9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c /sound/oss/sb_audio.c parent030305d69fc6963c16003f50d7e8d74b02d0a143 (diff)
PCI/MSI: Don't apply affinity if there aren't enough vectors left
Bart reported a problem wіth an out of bounds access in the low-level IRQ affinity code, which we root caused to the qla2xxx driver assigning all its MSI-X vectors to the pre and post vectors, and not having any left for the actually spread IRQs. Fix this issue by not asking for affinity assignment when there are no vectors to assign left. Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()") Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Tested-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'sound/oss/sb_audio.c')