From: Muli Ben-Yehuda <[email protected]>
trident_write_voice_regs() was getting called with the card spinlock
held in only some cases. Fix it.
Explanation: we allocate a new virtual channel in open, and then we
frob some hardware registers (in write_voice_regs) for that
channel. But the hardware registers are shared with other channels,
which may be trying to frob the some registers (albeit for another
channel) via ioctl(SNDCTL_DSP_SPEED).
Fixed bugzilla.kernel.org bug #8172 (http://bugme.osdl.org/show_bug.cgi?id=8172)
Signed-off-by: Muli Ben-Yehuda <[email protected]>
Cc: [email protected]
Cc: [email protected]
---
sound/oss/trident.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/sound/oss/trident.c b/sound/oss/trident.c
index 3e408f4..2e3e78e 100644
--- a/sound/oss/trident.c
+++ b/sound/oss/trident.c
@@ -2702,6 +2702,7 @@ trident_open(struct inode *inode, struct
struct trident_card *card = devs;
struct trident_state *state = NULL;
struct dmabuf *dmabuf = NULL;
+ unsigned long flags;
/* Added by Matt Wu 01-05-2001 */
/* TODO: there's some redundacy here wrt the check below */
@@ -2779,7 +2780,9 @@ trident_open(struct inode *inode, struct
/* set default channel attribute to normal playback */
dmabuf->channel->attribute = CHANNEL_PB;
}
+ spin_lock_irqsave(&card->lock, flags);
trident_set_dac_rate(state, 8000);
+ spin_unlock_irqrestore(&card->lock, flags);
}
if (file->f_mode & FMODE_READ) {
@@ -2797,7 +2800,9 @@ trident_open(struct inode *inode, struct
dmabuf->channel->attribute = (CHANNEL_REC | PCM_LR |
MONO_MIX);
}
+ spin_lock_irqsave(&card->lock, flags);
trident_set_adc_rate(state, 8000);
+ spin_unlock_irqrestore(&card->lock, flags);
/* Added by Matt Wu 01-05-2001 */
if (card->pci_id == PCI_DEVICE_ID_ALI_5451)
--
1.4.4
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