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drm/nouveau: Add a separate class for the kernel channel mutex.

Browse source 
nouveau_bo_move_m2mf() needs to lock the kernel channel, and it may be
called from the pushbuf IOCTL with an user channel already locked. Use
a separate subclass for the kernel channel mutex because this is
legitimate mutex nesting.

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Francisco Jerez 2010-10-25 23:38:59 +02:00 • committed by Ben Skeggs
commit e419cf0954
2 changed files with 6 additions and 1 deletions
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2
drivers/gpu/drm/nouveau/nouveau_bo.c
View file

@ -678,7 +678,7 @@ nouveau_bo_move_m2mf(struct ttm_buffer_object *bo, int evict, bool intr,
chan = nvbo->channel;
if (!chan || nvbo->no_vm) {
chan = dev_priv->channel;
mutex_lock(&chan->mutex);
mutex_lock_nested(&chan->mutex, NOUVEAU_KCHANNEL_MUTEX);
}
if (dev_priv->card_type < NV_50)

5
drivers/gpu/drm/nouveau/nouveau_drv.h
View file

@ -173,6 +173,11 @@ struct nouveau_page_flip_state {
uint64_t offset;
};
enum nouveau_channel_mutex_class {
NOUVEAU_UCHANNEL_MUTEX,
NOUVEAU_KCHANNEL_MUTEX
};
struct nouveau_channel {
struct drm_device *dev;
int id;