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SubjectRe: [alsa-devel] 2.6.26.[6|7]-rt11, alsa rawmidi, seq hang (tasklet_hi_schedule?)
At Wed, 19 Nov 2008 12:44:23 +0100,
I wrote:
>
> At Fri, 14 Nov 2008 10:57:10 -0800,
> Fernando Lopez-Lezcano wrote:
> >
> > On Fri, 2008-11-14 at 09:15 +0100, Clemens Ladisch wrote:
> > > Fernando Lopez-Lezcano wrote:
> > > > I've been trying to follow the printk crumbs without much success.
> > > > AFAICT it all points to tasklet_hi_schedule ...
> > >
> > > I don't have -rt, but if the error is similar to the old one you might
> > > try replacing tasklet_hi_schedule with tasklet_schedule.
> >
> > YES YES!! __Thanks__ for the suggestion, it WORKED!!
> >
> > Maybe the kernel rt gurus should look around and see _why_ the problem
> > was happening in the first place. There are not that many uses of
> > tasklet_hi_schedule in the kernel tree I'm working with:
> (snip)
> > Maybe other drivers are affected as well by the rt patch.
> > What is the difference between tasklet_hi_schedule and tasklet_schedule?
>
> AFAIK, tasklet_hi_schedule() uses another softirq vector with the
> highest priority (the first item to be scanned).
>
> Regarding the ALSA codes, there is no big reason to use hi_* version.
> Could you check the patch below and see whether you get any
> regressions?

Nando, any chance to test on your machines?


thanks,

Takashi

>
>
> thanks,
>
> Takashi
>
> ---
> diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
> index 39672f6..002777b 100644
> --- a/sound/core/rawmidi.c
> +++ b/sound/core/rawmidi.c
> @@ -151,7 +151,7 @@ static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *subs
> if (!substream->opened)
> return;
> if (up) {
> - tasklet_hi_schedule(&substream->runtime->tasklet);
> + tasklet_schedule(&substream->runtime->tasklet);
> } else {
> tasklet_kill(&substream->runtime->tasklet);
> substream->ops->trigger(substream, 0);
> @@ -908,7 +908,7 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
> }
> if (result > 0) {
> if (runtime->event)
> - tasklet_hi_schedule(&runtime->tasklet);
> + tasklet_schedule(&runtime->tasklet);
> else if (snd_rawmidi_ready(substream))
> wake_up(&runtime->sleep);
> }
> diff --git a/sound/core/rtctimer.c b/sound/core/rtctimer.c
> index 51e64e3..0851cd1 100644
> --- a/sound/core/rtctimer.c
> +++ b/sound/core/rtctimer.c
> @@ -118,7 +118,7 @@ static void rtctimer_tasklet(unsigned long data)
> */
> static void rtctimer_interrupt(void *private_data)
> {
> - tasklet_hi_schedule(private_data);
> + tasklet_schedule(private_data);
> }
>
>
> diff --git a/sound/core/timer.c b/sound/core/timer.c
> index c584408..7965320 100644
> --- a/sound/core/timer.c
> +++ b/sound/core/timer.c
> @@ -743,7 +743,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
> spin_unlock_irqrestore(&timer->lock, flags);
>
> if (use_tasklet)
> - tasklet_hi_schedule(&timer->task_queue);
> + tasklet_schedule(&timer->task_queue);
> }
>
> /*
> diff --git a/sound/drivers/vx/vx_core.c b/sound/drivers/vx/vx_core.c
> index 473b07f..14e3354 100644
> --- a/sound/drivers/vx/vx_core.c
> +++ b/sound/drivers/vx/vx_core.c
> @@ -548,7 +548,7 @@ irqreturn_t snd_vx_irq_handler(int irq, void *dev)
> (chip->chip_status & VX_STAT_IS_STALE))
> return IRQ_NONE;
> if (! vx_test_and_ack(chip))
> - tasklet_hi_schedule(&chip->tq);
> + tasklet_schedule(&chip->tq);
> return IRQ_HANDLED;
> }
>
> diff --git a/sound/drivers/vx/vx_pcm.c b/sound/drivers/vx/vx_pcm.c
> index 27de574..6644d00 100644
> --- a/sound/drivers/vx/vx_pcm.c
> +++ b/sound/drivers/vx/vx_pcm.c
> @@ -823,7 +823,7 @@ static int vx_pcm_trigger(struct snd_pcm_substream *subs, int cmd)
> * we trigger the pipe using tasklet, so that the interrupts are
> * issued surely after the trigger is completed.
> */
> - tasklet_hi_schedule(&pipe->start_tq);
> + tasklet_schedule(&pipe->start_tq);
> chip->pcm_running++;
> pipe->running = 1;
> break;
> diff --git a/sound/pci/es1968.c b/sound/pci/es1968.c
> index 20ee759..e9c3794 100644
> --- a/sound/pci/es1968.c
> +++ b/sound/pci/es1968.c
> @@ -1953,7 +1953,7 @@ static irqreturn_t snd_es1968_interrupt(int irq, void *dev_id)
> outw(inw(chip->io_port + 4) & 1, chip->io_port + 4);
>
> if (event & ESM_HWVOL_IRQ)
> - tasklet_hi_schedule(&chip->hwvol_tq); /* we'll do this later */
> + tasklet_schedule(&chip->hwvol_tq); /* we'll do this later */
>
> /* else ack 'em all, i imagine */
> outb(0xFF, chip->io_port + 0x1A);
> diff --git a/sound/pci/maestro3.c b/sound/pci/maestro3.c
> index 9ff3f9e..59bbaf8 100644
> --- a/sound/pci/maestro3.c
> +++ b/sound/pci/maestro3.c
> @@ -1670,7 +1670,7 @@ static irqreturn_t snd_m3_interrupt(int irq, void *dev_id)
> return IRQ_NONE;
>
> if (status & HV_INT_PENDING)
> - tasklet_hi_schedule(&chip->hwvol_tq);
> + tasklet_schedule(&chip->hwvol_tq);
>
> /*
> * ack an assp int if its running
> diff --git a/sound/pci/mixart/mixart_core.c b/sound/pci/mixart/mixart_core.c
> index b9a06c2..d3350f3 100644
> --- a/sound/pci/mixart/mixart_core.c
> +++ b/sound/pci/mixart/mixart_core.c
> @@ -550,7 +550,7 @@ irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
> mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
> mgr->msg_fifo_writeptr++;
> mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
> - tasklet_hi_schedule(&mgr->msg_taskq);
> + tasklet_schedule(&mgr->msg_taskq);
> }
> spin_unlock(&mgr->msg_lock);
> break;
> diff --git a/sound/pci/pcxhr/pcxhr.c b/sound/pci/pcxhr/pcxhr.c
> index 73de6e9..8309d44 100644
> --- a/sound/pci/pcxhr/pcxhr.c
> +++ b/sound/pci/pcxhr/pcxhr.c
> @@ -653,7 +653,7 @@ static int pcxhr_trigger(struct snd_pcm_substream *subs, int cmd)
> PCXHR_STREAM_STATUS_SCHEDULE_RUN;
> snd_pcm_trigger_done(s, subs);
> }
> - tasklet_hi_schedule(&chip->mgr->trigger_taskq);
> + tasklet_schedule(&chip->mgr->trigger_taskq);
> } else {
> stream = subs->runtime->private_data;
> snd_printdd("Only one Substream %c %d\n",
> diff --git a/sound/pci/pcxhr/pcxhr_core.c b/sound/pci/pcxhr/pcxhr_core.c
> index 7143259..4a5481f 100644
> --- a/sound/pci/pcxhr/pcxhr_core.c
> +++ b/sound/pci/pcxhr/pcxhr_core.c
> @@ -1213,7 +1213,7 @@ irqreturn_t pcxhr_interrupt(int irq, void *dev_id)
> mgr->dsp_time_last = PCXHR_DSP_TIME_INVALID;
>
> mgr->src_it_dsp = reg;
> - tasklet_hi_schedule(&mgr->msg_taskq);
> + tasklet_schedule(&mgr->msg_taskq);
> }
> #ifdef CONFIG_SND_DEBUG_VERBOSE
> if (reg & PCXHR_FATAL_DSP_ERR)
> diff --git a/sound/pci/riptide/riptide.c b/sound/pci/riptide/riptide.c
> index e9f0706..1d0eeb1 100644
> --- a/sound/pci/riptide/riptide.c
> +++ b/sound/pci/riptide/riptide.c
> @@ -1754,7 +1754,7 @@ snd_riptide_interrupt(int irq, void *dev_id)
> if (IS_EOBIRQ(cif->hwport) || IS_EOSIRQ(cif->hwport) ||
> IS_EOCIRQ(cif->hwport)) {
> chip->handled_irqs++;
> - tasklet_hi_schedule(&chip->riptide_tq);
> + tasklet_schedule(&chip->riptide_tq);
> }
> if (chip->rmidi && IS_MPUIRQ(cif->hwport)) {
> chip->handled_irqs++;
> diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
> index fdd3be5..44d0c15 100644
> --- a/sound/pci/rme9652/hdsp.c
> +++ b/sound/pci/rme9652/hdsp.c
> @@ -3750,7 +3750,7 @@ static irqreturn_t snd_hdsp_interrupt(int irq, void *dev_id)
> }
> }
> if (hdsp->use_midi_tasklet && schedule)
> - tasklet_hi_schedule(&hdsp->midi_tasklet);
> + tasklet_schedule(&hdsp->midi_tasklet);
> return IRQ_HANDLED;
> }
>
> diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
> index dc5c4ba..71231cf 100644
> --- a/sound/pci/rme9652/hdspm.c
> +++ b/sound/pci/rme9652/hdspm.c
> @@ -3476,7 +3476,7 @@ static irqreturn_t snd_hdspm_interrupt(int irq, void *dev_id)
> schedule = 1;
> }
> if (schedule)
> - tasklet_hi_schedule(&hdspm->midi_tasklet);
> + tasklet_schedule(&hdspm->midi_tasklet);
> return IRQ_HANDLED;
> }
>
> diff --git a/sound/pcmcia/pdaudiocf/pdaudiocf_irq.c b/sound/pcmcia/pdaudiocf/pdaudiocf_irq.c
> index fa4b113..ea903c8 100644
> --- a/sound/pcmcia/pdaudiocf/pdaudiocf_irq.c
> +++ b/sound/pcmcia/pdaudiocf/pdaudiocf_irq.c
> @@ -41,7 +41,7 @@ irqreturn_t pdacf_interrupt(int irq, void *dev)
> if (stat & PDAUDIOCF_IRQOVR) /* should never happen */
> snd_printk(KERN_ERR "PDAUDIOCF SRAM buffer overrun detected!\n");
> if (chip->pcm_substream)
> - tasklet_hi_schedule(&chip->tq);
> + tasklet_schedule(&chip->tq);
> if (!(stat & PDAUDIOCF_IRQAKM))
> stat |= PDAUDIOCF_IRQAKM; /* check rate */
> }
> diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
> index 5962e4b..6d9f9b1 100644
> --- a/sound/usb/usbmidi.c
> +++ b/sound/usb/usbmidi.c
> @@ -880,7 +880,7 @@ static void snd_usbmidi_output_trigger(struct snd_rawmidi_substream *substream,
> snd_rawmidi_transmit_ack(substream, 1);
> return;
> }
> - tasklet_hi_schedule(&port->ep->tasklet);
> + tasklet_schedule(&port->ep->tasklet);
> }
> }
>


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