Eric Lee / linux-smarc-t335x-v3.2

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Commit 8dce39b8955be6164172cb6204ef8fc21de27431

Authored by Krzysztof Helt
Committed by Takashi Iwai
1 parent 2bdf66331c
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

ALSA: opl3: circular locking in the snd_opl3_note_on() and snd_opl3_note_off() 

Fix following circular locking in the opl3 driver.

=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.32-rc3 #87
-------------------------------------------------------
swapper/0 is trying to acquire lock:
 (&opl3->voice_lock){..-...}, at: [<cca748fe>] snd_opl3_note_off+0x1e/0xe0 [snd_opl3_synth]

but task is already holding lock:
 (&opl3->sys_timer_lock){..-...}, at: [<cca75169>] snd_opl3_timer_func+0x19/0xc0 [snd_opl3_synth]

which lock already depends on the new lock.

the existing dependency chain (in reverse order) is:

-> #1 (&opl3->sys_timer_lock){..-...}:
       [<c02461d5>] validate_chain+0xa25/0x1040
       [<c0246aca>] __lock_acquire+0x2da/0xab0
       [<c024731a>] lock_acquire+0x7a/0xa0
       [<c044c300>] _spin_lock_irqsave+0x40/0x60
       [<cca75046>] snd_opl3_note_on+0x686/0x790 [snd_opl3_synth]
       [<cca68912>] snd_midi_process_event+0x322/0x590 [snd_seq_midi_emul]
       [<cca74245>] snd_opl3_synth_event_input+0x15/0x20 [snd_opl3_synth]
       [<cca4dcc0>] snd_seq_deliver_single_event+0x100/0x200 [snd_seq]
       [<cca4de07>] snd_seq_deliver_event+0x47/0x1f0 [snd_seq]
       [<cca4e50b>] snd_seq_dispatch_event+0x3b/0x140 [snd_seq]
       [<cca5008c>] snd_seq_check_queue+0x10c/0x120 [snd_seq]
       [<cca5037b>] snd_seq_enqueue_event+0x6b/0xe0 [snd_seq]
       [<cca4e0fd>] snd_seq_client_enqueue_event+0xdd/0x100 [snd_seq]
       [<cca4eb7a>] snd_seq_write+0xea/0x190 [snd_seq]
       [<c02827b6>] vfs_write+0x96/0x160
       [<c0282c9d>] sys_write+0x3d/0x70
       [<c0202c45>] syscall_call+0x7/0xb

-> #0 (&opl3->voice_lock){..-...}:
       [<c02467e6>] validate_chain+0x1036/0x1040
       [<c0246aca>] __lock_acquire+0x2da/0xab0
       [<c024731a>] lock_acquire+0x7a/0xa0
       [<c044c300>] _spin_lock_irqsave+0x40/0x60
       [<cca748fe>] snd_opl3_note_off+0x1e/0xe0 [snd_opl3_synth]
       [<cca751f0>] snd_opl3_timer_func+0xa0/0xc0 [snd_opl3_synth]
       [<c022ac46>] run_timer_softirq+0x166/0x1e0
       [<c02269e8>] __do_softirq+0x78/0x110
       [<c0226ac6>] do_softirq+0x46/0x50
       [<c0226e26>] irq_exit+0x36/0x40
       [<c0204bd2>] do_IRQ+0x42/0xb0
       [<c020328e>] common_interrupt+0x2e/0x40
       [<c021092f>] apm_cpu_idle+0x10f/0x290
       [<c0201b11>] cpu_idle+0x21/0x40
       [<c04443cd>] rest_init+0x4d/0x60
       [<c055c835>] start_kernel+0x235/0x280
       [<c055c066>] i386_start_kernel+0x66/0x70

other info that might help us debug this:

2 locks held by swapper/0:
 #0:  (&opl3->tlist){+.-...}, at: [<c022abd0>] run_timer_softirq+0xf0/0x1e0
 #1:  (&opl3->sys_timer_lock){..-...}, at: [<cca75169>] snd_opl3_timer_func+0x19/0xc0 [snd_opl3_synth]

stack backtrace:
Pid: 0, comm: swapper Not tainted 2.6.32-rc3 #87
Call Trace:
 [<c0245188>] print_circular_bug+0xc8/0xd0
 [<c02467e6>] validate_chain+0x1036/0x1040
 [<c0247f14>] ? check_usage_forwards+0x54/0xd0
 [<c0246aca>] __lock_acquire+0x2da/0xab0
 [<c024731a>] lock_acquire+0x7a/0xa0
 [<cca748fe>] ? snd_opl3_note_off+0x1e/0xe0 [snd_opl3_synth]
 [<c044c300>] _spin_lock_irqsave+0x40/0x60
 [<cca748fe>] ? snd_opl3_note_off+0x1e/0xe0 [snd_opl3_synth]
 [<cca748fe>] snd_opl3_note_off+0x1e/0xe0 [snd_opl3_synth]
 [<c044c307>] ? _spin_lock_irqsave+0x47/0x60
 [<cca751f0>] snd_opl3_timer_func+0xa0/0xc0 [snd_opl3_synth]
 [<c022ac46>] run_timer_softirq+0x166/0x1e0
 [<c022abd0>] ? run_timer_softirq+0xf0/0x1e0
 [<cca75150>] ? snd_opl3_timer_func+0x0/0xc0 [snd_opl3_synth]
 [<c02269e8>] __do_softirq+0x78/0x110
 [<c044c0fd>] ? _spin_unlock+0x1d/0x20
 [<c025915f>] ? handle_level_irq+0xaf/0xe0
 [<c0226ac6>] do_softirq+0x46/0x50
 [<c0226e26>] irq_exit+0x36/0x40
 [<c0204bd2>] do_IRQ+0x42/0xb0
 [<c024463c>] ? trace_hardirqs_on_caller+0x12c/0x180
 [<c020328e>] common_interrupt+0x2e/0x40
 [<c0208d88>] ? default_idle+0x38/0x50
 [<c021092f>] apm_cpu_idle+0x10f/0x290
 [<c0201b11>] cpu_idle+0x21/0x40
 [<c04443cd>] rest_init+0x4d/0x60
 [<c055c835>] start_kernel+0x235/0x280
 [<c055c210>] ? unknown_bootoption+0x0/0x210
 [<c055c066>] i386_start_kernel+0x66/0x70

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

Showing 1 changed file with 20 additions and 8 deletions Side-by-side Diff

sound/drivers/opl3/opl3_midi.c
Diff comments   View file @ 8dce39b
... ... @@ -29,6 +29,8 @@
29 29  
30 30 extern int use_internal_drums;
31 31  
  32 +static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
  33 + struct snd_midi_channel *chan);
32 34 /*
33 35 * The next table looks magical, but it certainly is not. Its values have
34 36 * been calculated as table[i]=8*log(i/64)/log(2) with an obvious exception
35 37  
36 38  
... ... @@ -242,16 +244,20 @@
242 244 int again = 0;
243 245 int i;
244 246  
245   - spin_lock_irqsave(&opl3->sys_timer_lock, flags);
  247 + spin_lock_irqsave(&opl3->voice_lock, flags);
246 248 for (i = 0; i < opl3->max_voices; i++) {
247 249 struct snd_opl3_voice *vp = &opl3->voices[i];
248 250 if (vp->state > 0 && vp->note_off_check) {
249 251 if (vp->note_off == jiffies)
250   - snd_opl3_note_off(opl3, vp->note, 0, vp->chan);
  252 + snd_opl3_note_off_unsafe(opl3, vp->note, 0,
  253 + vp->chan);
251 254 else
252 255 again++;
253 256 }
254 257 }
  258 + spin_unlock_irqrestore(&opl3->voice_lock, flags);
  259 +
  260 + spin_lock_irqsave(&opl3->sys_timer_lock, flags);
255 261 if (again) {
256 262 opl3->tlist.expires = jiffies + 1; /* invoke again */
257 263 add_timer(&opl3->tlist);
258 264  
... ... @@ -658,15 +664,14 @@
658 664 /*
659 665 * Release a note in response to a midi note off.
660 666 */
661   -void snd_opl3_note_off(void *p, int note, int vel, struct snd_midi_channel *chan)
  667 +static void snd_opl3_note_off_unsafe(void *p, int note, int vel,
  668 + struct snd_midi_channel *chan)
662 669 {
663 670 struct snd_opl3 *opl3;
664 671  
665 672 int voice;
666 673 struct snd_opl3_voice *vp;
667 674  
668   - unsigned long flags;
669   -
670 675 opl3 = p;
671 676  
672 677 #ifdef DEBUG_MIDI
673 678  
... ... @@ -674,12 +679,9 @@
674 679 chan->number, chan->midi_program, note);
675 680 #endif
676 681  
677   - spin_lock_irqsave(&opl3->voice_lock, flags);
678   -
679 682 if (opl3->synth_mode == SNDRV_OPL3_MODE_SEQ) {
680 683 if (chan->drum_channel && use_internal_drums) {
681 684 snd_opl3_drum_switch(opl3, note, vel, 0, chan);
682   - spin_unlock_irqrestore(&opl3->voice_lock, flags);
683 685 return;
684 686 }
685 687 /* this loop will hopefully kill all extra voices, because
... ... @@ -697,6 +699,16 @@
697 699 snd_opl3_kill_voice(opl3, voice);
698 700 }
699 701 }
  702 +}
  703 +
  704 +void snd_opl3_note_off(void *p, int note, int vel,
  705 + struct snd_midi_channel *chan)
  706 +{
  707 + struct snd_opl3 *opl3 = p;
  708 + unsigned long flags;
  709 +
  710 + spin_lock_irqsave(&opl3->voice_lock, flags);
  711 + snd_opl3_note_off_unsafe(p, note, vel, chan);
700 712 spin_unlock_irqrestore(&opl3->voice_lock, flags);
701 713 }
702 714