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authorMuli Ben-Yehuda <muli@il.ibm.com>2007-07-17 04:05:15 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-17 10:23:10 -0700
commit3b20b9b4e985fcc48b4eea401cb289a856422c93 (patch)
tree7af15a26530ae4c1623cd02a4722678747741a28 /sound/oss
parentd8f75b9183d613d3c29ea451a1cfb793daad5034 (diff)
downloadlinux-linaro-stable-3b20b9b4e985fcc48b4eea401cb289a856422c93.tar.gz
OSS trident: fix locking around write_voice_regs
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 <muli@il.ibm.com> Cc: <tammy000@gmail.com> Cc: <bunk@stusta.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'sound/oss')
-rw-r--r--sound/oss/trident.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/sound/oss/trident.c b/sound/oss/trident.c
index 3e408f491927..2e3e78e1bf67 100644
--- a/sound/oss/trident.c
+++ b/sound/oss/trident.c
@@ -2702,6 +2702,7 @@ trident_open(struct inode *inode, struct file *file)
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 file *file)
/* 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 file *file)
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)