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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>
This commit is contained in:
Francisco Jerez 2010-10-18 02:58:04 +02:00 committed by Ben Skeggs
parent f175b745b5
commit feeb0aecfb
2 changed files with 30 additions and 17 deletions
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44
drivers/gpu/drm/nouveau/nouveau_channel.c
View File

@ -237,34 +237,40 @@ nouveau_channel_alloc(struct drm_device *dev, struct nouveau_channel **chan_ret,
return 0;
}
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];
if (unlikely(!chan || (file_priv && chan->file_priv != file_priv))) {
spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
return ERR_PTR(-EINVAL);
}
if (unlikely(!atomic_inc_not_zero(&chan->refcount))) {
spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
return ERR_PTR(-EINVAL);
}
chan = nouveau_channel_get_unlocked(dev_priv->channels.ptr[id]);
spin_unlock_irqrestore(&dev_priv->channels.lock, flags);
if (unlikely(!chan))
return ERR_PTR(-EINVAL);
if (unlikely(file_priv && chan->file_priv != file_priv)) {
nouveau_channel_put_unlocked(&chan);
return ERR_PTR(-EINVAL);
}
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)

3
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -803,7 +803,10 @@ extern int nouveau_channel_alloc(struct drm_device *dev,
struct drm_file *file_priv,
uint32_t fb_ctxdma, uint32_t tt_ctxdma);
extern struct nouveau_channel *
nouveau_channel_get_unlocked(struct nouveau_channel *);
extern struct nouveau_channel *
nouveau_channel_get(struct drm_device *, struct drm_file *, int id);
extern void nouveau_channel_put_unlocked(struct nouveau_channel **);
extern void nouveau_channel_put(struct nouveau_channel **);
/* nouveau_object.c */