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drm/vmwgfx: Fix a circular locking dependency bug.

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Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Thomas Hellstrom
2010-02-08 09:57:25 +00:00
committed by Dave Airlie
parent a87897edba
commit 85b9e4878f
3 changed files with 14 additions and 19 deletions
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17
drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c
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@@ -74,6 +74,7 @@ int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
fifo->reserved_size = 0;
fifo->using_bounce_buffer = false;
mutex_init(&fifo->fifo_mutex);
init_rwsem(&fifo->rwsem);
/*
@@ -117,7 +118,7 @@ int vmw_fifo_init(struct vmw_private *dev_priv, struct vmw_fifo_state *fifo)
(unsigned int) min,
(unsigned int) fifo->capabilities);
dev_priv->fence_seq = dev_priv->last_read_sequence;
atomic_set(&dev_priv->fence_seq, dev_priv->last_read_sequence);
iowrite32(dev_priv->last_read_sequence, fifo_mem + SVGA_FIFO_FENCE);
return vmw_fifo_send_fence(dev_priv, &dummy);
@@ -283,7 +284,7 @@ void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes)
uint32_t reserveable = fifo_state->capabilities & SVGA_FIFO_CAP_RESERVE;
int ret;
down_write(&fifo_state->rwsem);
mutex_lock(&fifo_state->fifo_mutex);
max = ioread32(fifo_mem + SVGA_FIFO_MAX);
min = ioread32(fifo_mem + SVGA_FIFO_MIN);
next_cmd = ioread32(fifo_mem + SVGA_FIFO_NEXT_CMD);
@@ -351,7 +352,7 @@ void *vmw_fifo_reserve(struct vmw_private *dev_priv, uint32_t bytes)
}
out_err:
fifo_state->reserved_size = 0;
up_write(&fifo_state->rwsem);
mutex_unlock(&fifo_state->fifo_mutex);
return NULL;
}
@@ -426,6 +427,7 @@ void vmw_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
}
down_write(&fifo_state->rwsem);
if (fifo_state->using_bounce_buffer || reserveable) {
next_cmd += bytes;
if (next_cmd >= max)
@@ -437,8 +439,9 @@ void vmw_fifo_commit(struct vmw_private *dev_priv, uint32_t bytes)
if (reserveable)
iowrite32(0, fifo_mem + SVGA_FIFO_RESERVED);
mb();
vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
up_write(&fifo_state->rwsem);
vmw_fifo_ping_host(dev_priv, SVGA_SYNC_GENERIC);
mutex_unlock(&fifo_state->fifo_mutex);
}
int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *sequence)
@@ -451,9 +454,7 @@ int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *sequence)
fm = vmw_fifo_reserve(dev_priv, bytes);
if (unlikely(fm == NULL)) {
down_write(&fifo_state->rwsem);
*sequence = dev_priv->fence_seq;
up_write(&fifo_state->rwsem);
*sequence = atomic_read(&dev_priv->fence_seq);
ret = -ENOMEM;
(void)vmw_fallback_wait(dev_priv, false, true, *sequence,
false, 3*HZ);
@@ -461,7 +462,7 @@ int vmw_fifo_send_fence(struct vmw_private *dev_priv, uint32_t *sequence)
}
do {
*sequence = dev_priv->fence_seq++;
*sequence = atomic_add_return(1, &dev_priv->fence_seq);
} while (*sequence == 0);
if (!(fifo_state->capabilities & SVGA_FIFO_CAP_FENCE)) {