From: Mika Liljeberg <Mika.Liljeberg@welho.com>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux v2.5.39
Date: 28 Sep 2002 12:13:12 +0300 [thread overview]
Message-ID: <1033204392.616.10.camel@devil> (raw)
In-Reply-To: <Pine.LNX.4.33.0209271459210.1807-100000@penguin.transmeta.com>
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On Sat, 2002-09-28 at 01:02, Linus Torvalds wrote:
>
> Changes all over the map.
Looks like the attached patch didn't work its way in there. Please
apply. The patch is good for 2.5.39 as well.
The current code in sound/oss/audio.c tries to access spinlocks through
a garbage pointer in many places. This causes bad things to happen on
SMP machines.
Regards,
MikaL
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--- linux-2.5.38/sound/oss/audio.c.org 2002-09-23 20:57:10.000000000 +0300
+++ linux-2.5.38/sound/oss/audio.c 2002-09-23 22:34:45.000000000 +0300
@@ -826,37 +826,48 @@
if (!(audio_devs[dev]->flags & DMA_DUPLEX) && (bits & PCM_ENABLE_INPUT) &&
(bits & PCM_ENABLE_OUTPUT))
return -EINVAL;
- spin_lock_irqsave(&dmap->lock,flags);
- changed = audio_devs[dev]->enable_bits ^ bits;
- if ((changed & bits) & PCM_ENABLE_INPUT && audio_devs[dev]->go)
+
+ if (bits & PCM_ENABLE_INPUT)
{
- reorganize_buffers(dev, dmap_in, 1);
- if ((err = audio_devs[dev]->d->prepare_for_input(dev,
- dmap_in->fragment_size, dmap_in->nbufs)) < 0) {
- spin_unlock_irqrestore(&dmap->lock,flags);
- return -err;
- }
- dmap_in->dma_mode = DMODE_INPUT;
- audio_devs[dev]->enable_bits = bits;
- DMAbuf_activate_recording(dev, dmap_in);
+ spin_lock_irqsave(&dmap_in->lock,flags);
+ changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_INPUT;
+ if (changed && audio_devs[dev]->go)
+ {
+ reorganize_buffers(dev, dmap_in, 1);
+ if ((err = audio_devs[dev]->d->prepare_for_input(dev,
+ dmap_in->fragment_size, dmap_in->nbufs)) < 0) {
+ spin_unlock_irqrestore(&dmap_in->lock,flags);
+ return -err;
+ }
+ dmap_in->dma_mode = DMODE_INPUT;
+ audio_devs[dev]->enable_bits |= PCM_ENABLE_INPUT;
+ DMAbuf_activate_recording(dev, dmap_in);
+ } else
+ audio_devs[dev]->enable_bits &= ~PCM_ENABLE_INPUT;
+ spin_unlock_irqrestore(&dmap_in->lock,flags);
}
- if ((changed & bits) & PCM_ENABLE_OUTPUT &&
- (dmap_out->mapping_flags & DMA_MAP_MAPPED || dmap_out->qlen > 0) &&
- audio_devs[dev]->go)
+ if (bits & PCM_ENABLE_OUTPUT)
{
- if (!(dmap_out->flags & DMA_ALLOC_DONE))
- reorganize_buffers(dev, dmap_out, 0);
- dmap_out->dma_mode = DMODE_OUTPUT;
- audio_devs[dev]->enable_bits = bits;
- dmap_out->counts[dmap_out->qhead] = dmap_out->fragment_size;
- DMAbuf_launch_output(dev, dmap_out);
+ spin_lock_irqsave(&dmap_out->lock,flags);
+ changed = (audio_devs[dev]->enable_bits ^ bits) & PCM_ENABLE_OUTPUT;
+ if (changed &&
+ (dmap_out->mapping_flags & DMA_MAP_MAPPED || dmap_out->qlen > 0) &&
+ audio_devs[dev]->go)
+ {
+ if (!(dmap_out->flags & DMA_ALLOC_DONE))
+ reorganize_buffers(dev, dmap_out, 0);
+ dmap_out->dma_mode = DMODE_OUTPUT;
+ audio_devs[dev]->enable_bits |= PCM_ENABLE_OUTPUT;
+ dmap_out->counts[dmap_out->qhead] = dmap_out->fragment_size;
+ DMAbuf_launch_output(dev, dmap_out);
+ } else
+ audio_devs[dev]->enable_bits &= ~PCM_ENABLE_OUTPUT;
+ spin_unlock_irqrestore(&dmap_out->lock,flags);
}
- audio_devs[dev]->enable_bits = bits;
#if 0
if (changed && audio_devs[dev]->d->trigger)
audio_devs[dev]->d->trigger(dev, bits * audio_devs[dev]->go);
#endif
- spin_unlock_irqrestore(&dmap->lock,flags);
/* Falls through... */
case SNDCTL_DSP_GETTRIGGER:
@@ -873,7 +884,7 @@
case SNDCTL_DSP_GETIPTR:
if (!(audio_devs[dev]->open_mode & OPEN_READ))
return -EINVAL;
- spin_lock_irqsave(&dmap->lock,flags);
+ spin_lock_irqsave(&dmap_in->lock,flags);
cinfo.bytes = dmap_in->byte_counter;
cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_in, DMODE_INPUT) & ~3;
if (cinfo.ptr < dmap_in->fragment_size && dmap_in->qtail != 0)
@@ -882,7 +893,7 @@
cinfo.bytes += cinfo.ptr;
if (dmap_in->mapping_flags & DMA_MAP_MAPPED)
dmap_in->qlen = 0; /* Reset interrupt counter */
- spin_unlock_irqrestore(&dmap->lock,flags);
+ spin_unlock_irqrestore(&dmap_in->lock,flags);
if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
return -EFAULT;
return 0;
@@ -891,7 +902,7 @@
if (!(audio_devs[dev]->open_mode & OPEN_WRITE))
return -EINVAL;
- spin_lock_irqsave(&dmap->lock,flags);
+ spin_lock_irqsave(&dmap_out->lock,flags);
cinfo.bytes = dmap_out->byte_counter;
cinfo.ptr = DMAbuf_get_buffer_pointer(dev, dmap_out, DMODE_OUTPUT) & ~3;
if (cinfo.ptr < dmap_out->fragment_size && dmap_out->qhead != 0)
@@ -900,7 +911,7 @@
cinfo.bytes += cinfo.ptr;
if (dmap_out->mapping_flags & DMA_MAP_MAPPED)
dmap_out->qlen = 0; /* Reset interrupt counter */
- spin_unlock_irqrestore(&dmap->lock,flags);
+ spin_unlock_irqrestore(&dmap_out->lock,flags);
if (copy_to_user(arg, &cinfo, sizeof(cinfo)))
return -EFAULT;
return 0;
@@ -913,7 +924,7 @@
ret=0;
break;
}
- spin_lock_irqsave(&dmap->lock,flags);
+ spin_lock_irqsave(&dmap_out->lock,flags);
/* Compute number of bytes that have been played */
count = DMAbuf_get_buffer_pointer (dev, dmap_out, DMODE_OUTPUT);
if (count < dmap_out->fragment_size && dmap_out->qhead != 0)
@@ -923,7 +934,7 @@
count = dmap_out->user_counter - count;
if (count < 0)
count = 0;
- spin_unlock_irqrestore(&dmap->lock,flags);
+ spin_unlock_irqrestore(&dmap_out->lock,flags);
ret = count;
break;
next prev parent reply other threads:[~2002-09-28 9:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-27 22:02 Linux v2.5.39 Linus Torvalds
2002-09-27 22:27 ` Udo A. Steinberg
2002-09-27 22:35 ` Jasper Spaans
2002-09-28 9:13 ` Mika Liljeberg [this message]
2002-09-28 11:51 ` Thomas Molina
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