/* * sound/oss/sys_timer.c * * The default timer for the Level 2 sequencer interface * Uses the (1/HZ sec) timer of kernel. */ /* * Copyright (C) by Hannu Savolainen 1993-1997 * * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL) * Version 2 (June 1991). See the "COPYING" file distributed with this software * for more info. */ /* * Thomas Sailer : ioctl code reworked (vmalloc/vfree removed) * Andrew Veliath : adapted tmr2ticks from level 1 sequencer (avoid overflow) */ #include #include "sound_config.h" static volatile int opened, tmr_running; static volatile unsigned int tmr_offs, tmr_ctr; static volatile unsigned long ticks_offs; static volatile int curr_tempo, curr_timebase; static volatile unsigned long curr_ticks; static volatile unsigned long next_event_time; static unsigned long prev_event_time; static void poll_def_tmr(unsigned long dummy); static DEFINE_SPINLOCK(lock); static DEFINE_TIMER(def_tmr, poll_def_tmr, 0, 0); static unsigned long tmr2ticks(int tmr_value) { /* * Convert timer ticks to MIDI ticks */ unsigned long tmp; unsigned long scale; /* tmr_value (ticks per sec) * 1000000 (usecs per sec) / HZ (ticks per sec) -=> usecs */ tmp = tmr_value * (1000000 / HZ); scale = (60 * 1000000) / (curr_tempo * curr_timebase); /* usecs per MIDI tick */ return (tmp + scale / 2) / scale; } static void poll_def_tmr(unsigned long dummy) { if (!opened) return; def_tmr.expires = (1) + jiffies; add_timer(&def_tmr); if (!tmr_running) return; spin_lock(&lock); tmr_ctr++; curr_ticks = ticks_offs + tmr2ticks(tmr_ctr); if (curr_ticks >= next_event_time) { next_event_time = (unsigned long) -1; sequencer_timer(0); } spin_unlock(&lock); } static void tmr_reset(void) { unsigned long flags; spin_lock_irqsave(&lock,flags); tmr_offs = 0; ticks_offs = 0; tmr_ctr = 0; next_event_time = (unsigned long) -1; prev_event_time = 0; curr_ticks = 0; spin_unlock_irqrestore(&lock,flags); } static int def_tmr_open(int dev, int mode) { if (opened) return -EBUSY; tmr_reset(); curr_tempo = 60; curr_timebase = 100; opened = 1; { def_tmr.expires = (1) + jiffies; add_timer(&def_tmr); } return 0; } static void def_tmr_close(int dev) { opened = tmr_running = 0; del_timer(&def_tmr); } static int def_tmr_event(int dev, unsigned char *event) { unsigned char cmd = event[1]; unsigned long parm = *(int *) &event[4]; switch (cmd) { case TMR_WAIT_REL: parm += prev_event_time; case TMR_WAIT_ABS: if (parm > 0) { long time; if (parm <= curr_ticks) /* It's the time */ return TIMER_NOT_ARMED; time = parm; next_event_time = prev_event_time = time; return TIMER_ARMED; } break; case TMR_START: tmr_reset(); tmr_running = 1; break; case TMR_STOP: tmr_running = 0; break; case TMR_CONTINUE: tmr_running = 1; break; case TMR_TEMPO: if (parm) { if (parm < 8) parm = 8; if (parm > 360) parm = 360; tmr_offs = tmr_ctr; ticks_offs += tmr2ticks(tmr_ctr); tmr_ctr = 0; curr_tempo = parm; } break; case TMR_ECHO: seq_copy_to_input(event, 8); break; default:; } return TIMER_NOT_ARMED; } static unsigned long def_tmr_get_time(int dev) { if (!opened) return 0; return curr_ticks; } /* same as sound_timer.c:timer_ioctl!? */ static int def_tmr_ioctl(int dev, unsigned int cmd, void __user *arg) { int __user *p = arg; int val; switch (cmd) { case SNDCTL_TMR_SOURCE: return __put_user(TMR_INTERNAL, p); case SNDCTL_TMR_START: tmr_reset(); tmr_running = 1; return 0; case SNDCTL_TMR_STOP: tmr_running = 0; return 0; case SNDCTL_TMR_CONTINUE: tmr_running = 1; return 0; case SNDCTL_TMR_TIMEBASE: if (__get_user(val, p)) return -EFAULT; if (val) { if (val < 1) val = 1; if (val > 1000) val = 1000; curr_timebase = val; } return __put_user(curr_timebase, p); case SNDCTL_TMR_TEMPO: if (__get_user(val, p)) return -EFAULT; if (val) { if (val < 8) val = 8; if (val > 250) val = 250; tmr_offs = tmr_ctr; ticks_offs += tmr2ticks(tmr_ctr); tmr_ctr = 0; curr_tempo = val; reprogram_timer(); } return __put_user(curr_tempo, p); case SNDCTL_SEQ_CTRLRATE: if (__get_user(val, p)) return -EFAULT; if (val != 0) /* Can't change */ return -EINVAL; val = ((curr_tempo * curr_timebase) + 30) / 60; return __put_user(val, p); case SNDCTL_SEQ_GETTIME: return __put_user(curr_ticks, p); case SNDCTL_TMR_METRONOME: /* NOP */ break; default:; } return -EINVAL; } static void def_tmr_arm(int dev, long time) { if (time < 0) time = curr_ticks + 1; else if (time <= curr_ticks) /* It's the time */ return; next_event_time = prev_event_time = time; return; } struct sound_timer_operations default_sound_timer = { .owner = THIS_MODULE, .info = {"System clock", 0}, .priority = 0, /* Priority */ .devlink = 0, /* Local device link */ .open = def_tmr_open, .close = def_tmr_close, .event = def_tmr_event, .get_time = def_tmr_get_time, .ioctl = def_tmr_ioctl, .arm_timer = def_tmr_arm }; 8ad31f49ec0d71fe9e5b1994c /include/net/rtnetlink.h 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 'include/net/rtnetlink.h')