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authorFrancisco Jerez <currojerez@riseup.net>2010-10-18 02:58:04 +0200
committerBen Skeggs <bskeggs@redhat.com>2010-12-03 15:06:38 +1000
commitfeeb0aecfb73b5b7699c0a85ba1650e6f9c50be2 (patch)
tree9b0d496bf886399aa40c416665c61ef43db230b1 /drivers/gpu/drm/nouveau/nouveau_channel.c
parentf175b745b50c5c5356e8b3b409b7f38aa44de6bb (diff)
drm/nouveau: Add unlocked variants of nouveau_channel_get/put.
Signed-off-by: Francisco Jerez <currojerez@riseup.net> Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_channel.c')
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_channel.c36
1 files changed, 23 insertions, 13 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_channel.c b/drivers/gpu/drm/nouveau/nouveau_channel.c
index c46a6f64196..38929fd3f4e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_channel.c
+++ b/drivers/gpu/drm/nouveau/nouveau_channel.c
@@ -238,33 +238,39 @@ nouveau_channel_alloc(struct drm_device *dev, struct nouveau_channel **chan_ret,
}
struct nouveau_channel *
+nouveau_channel_get_unlocked(struct nouveau_channel *ref)
+{
+ if (likely(ref && atomic_inc_not_zero(&ref->refcount)))
+ return ref;
+
+ return NULL;
+}
+
+struct nouveau_channel *
nouveau_channel_get(struct drm_device *dev, struct drm_file *file_priv, int id)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
- struct nouveau_channel *chan = ERR_PTR(-ENODEV);
+ struct nouveau_channel *chan;
unsigned long flags;
spin_lock_irqsave(&dev_priv->channels.lock, flags);
- chan = dev_priv->channels.ptr[id];
+ chan = nouveau_channel_get_unlocked(dev_priv->channels.ptr[id]);
+ spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
- if (unlikely(!chan || (file_priv && chan->file_priv != file_priv))) {
- spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
+ if (unlikely(!chan))
return ERR_PTR(-EINVAL);
- }
- if (unlikely(!atomic_inc_not_zero(&chan->refcount))) {
- spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
+ if (unlikely(file_priv && chan->file_priv != file_priv)) {
+ nouveau_channel_put_unlocked(&chan);
return ERR_PTR(-EINVAL);
}
- spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
-
mutex_lock(&chan->mutex);
return chan;
}
void
-nouveau_channel_put(struct nouveau_channel **pchan)
+nouveau_channel_put_unlocked(struct nouveau_channel **pchan)
{
struct nouveau_channel *chan = *pchan;
struct drm_device *dev = chan->dev;
@@ -274,9 +280,6 @@ nouveau_channel_put(struct nouveau_channel **pchan)
unsigned long flags;
int ret;
- /* unlock the channel */
- mutex_unlock(&chan->mutex);
-
/* decrement the refcount, and we're done if there's still refs */
if (likely(!atomic_dec_and_test(&chan->refcount))) {
*pchan = NULL;
@@ -348,6 +351,13 @@ nouveau_channel_put(struct nouveau_channel **pchan)
kfree(chan);
}
+void
+nouveau_channel_put(struct nouveau_channel **pchan)
+{
+ mutex_unlock(&(*pchan)->mutex);
+ nouveau_channel_put_unlocked(pchan);
+}
+
/* cleans up all the fifos from file_priv */
void
nouveau_channel_cleanup(struct drm_device *dev, struct drm_file *file_priv)